Fable Test — Anchor 3D

Summary

Capability-test session: assess whether Anchor 2 could be extended into "Anchor 3" with 3D game support on top of the newly released Box3D physics engine — then actually build it, fix it live, add interaction features, ship it as a playable web build, and finally embed it as a playable element INSIDE the engine-rendered a327ex.com itself (no iframe — the game runs in the site renderer's own Lua VM). The session produced a complete siloed 3D engine extension at E:/a327ex/Anchor3/ and a new ::game content directive for the website.

Box3D feasibility assessment:

• Box3D facts established via web research: released 2026-06-30 by Erin Catto, MIT, C17, CMake; shapes = spheres/capsules/convex hulls/triangle meshes/height fields; joints = revolute/prismatic/distance/motor/weld/wheel; contact/sensor/hit events; ray/shape casts and overlap queries; cross-platform determinism, SIMD (SSE2/Neon), Emscripten support; alpha status with character movement + ghost-collision mitigation explicitly listed as future work.
• Grounded the assessment in anchor.c (~13.5k lines): the 2D renderer is hardwired at every level (VERTEX_FLOATS 32 with vec2 positions, gl_Position = projection * vec4(aPos, 0.0, 1.0) — z literally 0, 2×3 affine transforms, orthographic only, painter's-algorithm layers, no depth testing, SDF übershader). Physics bindings (76 l_physics_* functions) map ~1:1 to Box3D.
• Verdict: physics is ~15-20% of the job (the easy part); the renderer is the mountain. The layer system is the natural seam — a 3D layer type renders into its own depth-attached FBO and composites through the existing layer chain, so the entire 2D UI/text/post-process stack survives untouched.
• Scope tiers offered: (a) 2.5D billboards, (b) primitive-3D flat-shaded instanced primitives matching the physics shape set (recommended), (c) asset-driven 3D (ruled out). Owner picked (b) in a new siloed Anchor3/ folder with continuous-work authorization.
• Full assessment written to Anchor2/reference/anchor3_assessment.md.

Anchor 3 build (phases 0–7, single continuous run):

• Phase 0: scaffolded Anchor3/ from an Anchor2 copy; baseline build green.
• Phase 1: vendored Box3D pinned at commit 52f1a254 ("Name cache (#53)", 2026-07-06), flattened into engine/include/box3d/ following the box2d pattern.
• Phase 2: C math section — column-major GL mat4 (multiply/perspective/look-at/invert), quat→mat3, quat from-to.
• Phase 3: 72 physics3_* bindings mirroring the 2D surface (tags/collision matrix, bodies, sphere/box/capsule/cylinder/hull/heightfield/grid-mesh shapes, events, queries, raycasts); test-physics3/ headless suite 28 tests green.
• Phases 4–5: layer3 — 3D scene pass into a standard Layer FBO (depth via the existing DEPTH24_STENCIL8 RBO), instanced flat-shaded unit meshes (box/sphere/hemisphere/cylinder/plane; capsule = 3 instances), Lambert + ambient, 3D line batch, Box3D debug draw, perspective camera, unproject/picking. 31/31 headless tests.
• Phase 6: framework modules — math3, layer3 wrapper, collider3 (class; sync copies pos+rot), camera3 (orbit), physics3 entity-resolving wrappers.
• Phase 7: playground toy — 55-crate pyramid + balls on a 40×40 m ground slab; RMB orbit, wheel zoom, B ball, space shockwave, F1 debug draw, R reset; 2D HUD composited on top. Conventions: Y-up right-handed, meters, quaternion-primary rotations (x,y,z,w across the Lua boundary).

First windowed run — two fixes:

• bad argument #3 to 'format' (number has no integer representation) — Lua 5.4 rejects fractional floats in %d; fps needed math.floor.
• collider3.lua:102: Invalid body after a shockwave — an entity killed by the y < -30 cull was destroyed at end-of-update but stayed in the draw array until the next update's dead-sweep, so draw() ran once on a corpse. The 2D collider never hit this because its draw uses synced owner fields; collider3:draw() queries the body live. Fix: nil-body guard in collider3:draw.

Grab joint + camera cannon:

• Box3D ships no mouse joint — used its motor joint with only the linear spring active (hertz 5, damping 0.7, max force 1000×mass), anchored to a hidden shapeless static world body at the origin so world targets pass through as frame-A locals. Four new C bindings: physics3_create_grab_joint, physics3_joint_set_target (wakes bodies), physics3_destroy_joint, physics3_joint_is_valid. Rotation left free, classic mouse-joint feel.
• Playground: LMB raycast-grabs at the hit point and holds the target at the grab distance along the live mouse ray; B shoots a ball from the camera along the mouse ray (40 m/s, density 2000 — b3Shape_SetDensity(..., updateBodyMass=true)).

Architecture Q&A — "could we make an arena shooter?":

• No big architectural hole: mouse capture already existed in the engine (mouse_set_grabbed, relative mouse_delta); real gaps are Lua-only (FPS camera mode, motion-locked capsule movement — flat arenas dodge Box3D's alpha character-controller weaknesses). Owner: "you did it in like 2 turns which is insane lol" — no game will be built from this; it was a capability test.

Web build:

• Anchor3/engine/build-web-engine.sh: compiles box3d/*.c with -DBOX3D_DISABLE_SIMD (scalar B3_SIMD_NONE), mirroring box2d; anchor.wasm 2.47 MB. scripts/package-web-game.sh with resolution/render-mode args + a shell hardened against background-tab loads (zero-size layout guard + visibilitychange/pageshow revive + retry — a hidden-tab load used to brick the canvas at 0×0).
• Engine fix: the composite/mouse scale clamp (scale < 1 → 1, 4 sites) became #ifndef __EMSCRIPTEN__ — web viewports narrower than the game's base resolution fit down instead of cropping.
• Verified in-browser: pyramid + HUD render, synthesized-input shockwave physics, 60 fps, kill-plane culling (bodies 56→28).

First publish (superseded later the same session):

• Session was ended and the log published at this point; the game was then hosted as a standalone page under media/ and a feed message linked it. The owner immediately pushed further: "I'd like the game directive to be able to embed the game as a playable frame on the page itself... the whole point of rendering the website in-engine is being able to deploy games in-engine easily, without using web technologies."

In-engine ::game embedding (the second half of the session):

• Key insight making it feasible: Anchor3's engine is a strict superset of Anchor2's (forked the same day), so building the site's anchor.wasm from Anchor3/engine gives the site renderer physics3_*/layer3_* for free while running byte-for-byte identically otherwise. Owner decision (a): site engine builds from Anchor3 as a one-off; merge-back governance deferred.
• Engine additions (Anchor3 anchor.c): fixed-size layers (layer_create(name, filter, w, h) + layer3_create(name, w, h)) exempt from the web-native resize sweep; layer_render(layer, clear) no-clear flag for a second same-frame bake pass; layer_draw_into(dst, src, x, y, w, h) — viewport-rect variant of layer_draw_from for compositing a game layer into the document at the element rect; layer_resize(layer, w, h) Lua binding.
• renderer/game_host.lua: runs a game INSIDE the site's Lua VM. Sandboxed _ENV (reads fall through to the engine API, writes stay private); require resolves into the game's own packaged framework copy (renderer/games/<name>/); engine-init config setters are no-ops; engine_get_width/height report the game's virtual resolution; layer_create/layer3_create shadowed to fixed-size prefixed layers; layer_draw shadowed to queue composites; input shadowed through a host-local bind registry evaluated from raw engine key/mouse state; resource paths remapped into the package dir. Lifecycle: click-to-start cover, update gated by visibility (physics3_set_enabled gates the world), one live instance.
• ::game NAME directive: parsed + serialized in convert.lua, layout_game_element/draw_game_element in elements.lua, dispatch in canvas.lua — covers both the homepage feed and post pages via the shared element pipeline. The Lua/SEO fallback site keeps the iframe form (game moved to media/shared/games/).
• main.lua wiring: game_host_update in update; mid-frame game_host_composite(ui_layer) after content (bake → composite → overlays land in a second no-clear render pass); while the game captures the cursor the page stands down on wheel scroll, the right-click menu, click dispatch, and text-selection arming (added to sel's no_arm list alongside media cards).
• build-web.sh: engine source switched to Anchor3, game package + game_host.lua preloaded (the explicit-preload-list lesson respected).
• Verification detour: the preview browser's tab is permanently hidden (rAF frozen, screenshots time out) — forced the loop via a MessageChannel scheduler and captured frames as base64 through postMainLoop hooks, re-learning PLAN.md's documented lesson that update()-path bugs need a real browser. Owner tested locally from that point on.

Live-testing iterations with the owner:

• Input model v1 (click-to-focus) leaked drags into the site's text selection and felt unnatural. Rebuilt as HOVER capture: the game owns mouse + keys while the cursor is inside its rect, the site otherwise, with a drag latch (held buttons keep capture) so grabs that slip outside the frame don't drop.
• Border/ring removed entirely (owner call — frameless).
• Sizing iterations: 960 centered breakout (looked "off") → full-bleed strip options discussed → owner picked (b): the scene itself spans the window edge to edge at design height. First attempt looked STRETCHED — root cause found in the ENGINE: the 2D batch's orthographic projection was set once per frame from the global canvas size and reused for every layer; any layer with its own resolution rendered scaled by layer/canvas per axis. Fix: layer_render now rebinds the projection from the layer's own dimensions (same shared-shader rationale as the existing per-layer u_aa_width rebind). The 3D pass was always aspect-correct (perspective reads the backing layer). With the fix, option (b) works: layers created at (window width × 540), resized in place on window resize via the new layer_resize binding — state intact, no restart.
• F1 collision: the site's spacing-tuner bind (ui_toggle on key:f1) shadowed the game's F1 debug-draw toggle — removed from the site.
• Noted for later: touch-key chips for mobile (the host knows every game's binds, so tappable action buttons can be generated generically); mobile testing deferred.

Publishing:

• Homepage message rewritten in the owner's words with the embedded ::game anchor3-playground below it; this log regenerated to cover the full session; Anchor3 + a327ex-site committed; engine site deployed with the Anchor3-based wasm.

Hi Fable, another test for you. Recently Box3D was released and it seems most people think it's high quality. I'd like to see how feasible it would be to expand Anchor 2 into Anchor 3 by making it support 3D games. I know this is likely a huge task, but given that we have physics already with a similar interface, as Box3D matches Box2D where it matters, it probably made the job a lot easier. I'd like your initial assessment of the task and its scope.

Fable 5

I'll ground this in the actual engine code before giving you an assessment. Let me look at how Anchor 2's C engine is structured — particularly the renderer and the Box2D integration surface — and also check what's actually known about Box3D.

1    # Anchor 2
2   
3   Guidelines for Claude Code instances working on this project.
4   
5   ---
6   
7   ## What this is
8   
9   Anchor 2 is a rewrite of Anchor's Lua framework layer. The C engine (`engine/src/anchor.c`) is unchanged from Anchor 1. This rewrite replaces the framework-level abstractions (object tree, action phases, hook system) with minimal code and explicit disciplines.
10  
11  **Read `reference/anchor2_plan.md` first.** It's the authoritative plan for this project. If you're picking this up mid-implementation, also read `reference/progress.md` and `reference/questions_for_user.md`.
12  
13  ## Core philosophy (in one paragraph)
14  
15  Minimal framework, maximal explicitness. Code reads top-to-bottom. There's no hidden work. Cross-entity references are IDs, not pointers. Framework modules are mostly procedural (functions operating on plain tables); entity classes stay OOP because game code benefits from method syntax. Verbose patterns that AI writes easily and humans read easily are preferred over clever compact idioms.
16  
17  ## Critical patterns
18  
19  **Use IDs, not direct references for cross-entity pointers.** `self.source_orb_id = orb.id`, not `self.source_orb = orb`. Resolve with `entities[self.source_orb_id]` at the top of functions that need it. This is the single most important pattern.
20  
21  **Poll, don't subscribe.** When entity A needs to react to entity B's state, A checks each frame in its own update. No event subscription.
22  
23  **Cross-entity relationships live in relational tables.** Not as back-references on entities. See `pack_members = {pack_id → [seeker_ids]}` pattern.
24  
25  **Compositional children are plain fields with manual destructors.** `self.timer = timer_new()` + `self.timer = nil` (or equivalent cleanup) in `:destroy`. No framework-managed `own`.
26  
27  **Framework modules are mostly procedural.** `timer_update(self.timer, dt)` not `self.timer:update(dt)`. `layer_*` functions take a layer from `layer_new` as the first argument (see `framework/anchor/layer.lua` for engine name conflicts). **`collider` stays a class** (body+shape bundling + steering).
28  
29  ## What you will NOT find here
30  
... [165 more lines]

19:#include <stdio.h>
20:#include <stdlib.h>
21:#include <stdbool.h>
22:#include <string.h>
23:#include <math.h>
26:#include <direct.h>  // _chdir
27:#include <windows.h>  // RegisterHotKey, PeekMessage for global hotkeys
28:#include <psapi.h>    // GetProcessMemoryInfo for memory tracking
29:#include <winhttp.h>  // desktop http_get/http_post (see l_http_get; link: winhttp.lib)
30:#include <SDL_syswm.h>  // HWND for window_flash (FlashWindowEx)
33:#include <unistd.h>  // chdir
36:#include <SDL.h>
46:#include <lua.h>
47:#include <lualib.h>
48:#include <lauxlib.h>
51:#include <stb_image.h>
54:#include <stb_perlin.h>
57:#include <stb_image_write.h>
60:#include <stb_image_resize2.h>
63:#include <stb_vorbis.c>
65:#include <ft2build.h>
66:#include <freetype/freetype.h>
67:#include <freetype/ftmodapi.h>   // FT_Property_Set (TrueType interpreter version)
68:#include <freetype/ftoutln.h>    // FT_Outline_Embolden (heavier text — grayscale AA reads thin vs browser ClearType)
72:#include <miniaudio.h>
75:#include <libavformat/avformat.h>
76:#include <libavcodec/avcodec.h>
77:#include <libavutil/avutil.h>
78:#include <libavutil/channel_layout.h>
79:#include <libswscale/swscale.h>
... [8 more lines]

[
  {
    "type": "tool_reference",
    "tool_name": "WebSearch"
  },
  {
    "type": "tool_reference",
    "tool_name": "WebFetch"
  }
]

Now let me map the engine's internals and check what's actually known about Box3D, in parallel.

Anchor2\engine\src\anchor.c:27

Found 27 total occurrences across 1 file.

Anchor2\engine\src\anchor.c:368

Found 368 total occurrences across 1 file.

94:// ============================================================================
96:// ============================================================================
134:// ============================================================================
136:// ============================================================================
186:// ============================================================================
189:// ============================================================================
507:// ============================================================================
511:// ============================================================================
840:// ============================================================================
843:// ============================================================================
1174:// ---- Dynamic glyph atlas --------------------------------------------------
1648:// =====================================================================
1653:// =====================================================================
1744:// =====================================================================
1759:// =====================================================================
1827:// ---- audio data source: drain the ring on the audio thread ----
1881:// ---- decoded-video frame queue (YUV AVFrames awaiting present, by pts) ----
2132:// ---- Lua bindings ----
2957:// ============================================================================
2960:// ============================================================================
3518:// ============================================================================
3521:// ============================================================================
3780:// ============================================================================
3783:// ============================================================================
5072:// ============================================================================
5075:// ============================================================================
6149:// ============================================================================
6152:// ============================================================================
6455:// ---- Web lazy image fetch -----------------------------------------------------
7390:// ============================================================================
... [24 more lines]

Web search results for query: "Box3D Erin Catto 3D physics engine release"

Links: [{"title":"Box3D: Erin Catto Releases an Open Source 3D Physics Engine - Developers Digest","url":"https://www.developersdigest.tech/blog/box3d-open-source-3d-physics-engine"},{"title":"Box3D Debuts As New Open-Source 3D Physics Engine - Phoronix","url":"https://www.phoronix.com/news/Box3D-Open-Source-3D-Physics"},{"title":"Box3D: New Open-Source 3D Physics Engine","url":"https://80.lv/articles/box3d-new-open-source-3d-physics-engine"},{"title":"Erin Catto on X: \"I’m happy to announce the release of a new open source 3D physics engine called Box3D. I’ve been working on this project for a few years now, but it represents over 20 years of experience writing physics engines for games. Read more here: https://t.co/2d9aVuUsxj\" / X","url":"https://x.com/erin_catto/status/2072326622590730604"},{"title":"Box3D: The Open-Source 3D Physics Engine Built for Games | byteiota","url":"https://byteiota.com/box3d-the-open-source-3d-physics-engine-built-for-games/"},{"title":"BOX3D IS NOW OPEN SOURCE — Kintsugiyama","url":"https://www.kintsugiyama.com/updates/box3d-is-now-open-source"},{"title":"Box2D Creator Unveils Open-Source 3D Physics Engine Box3D","url":"https://abit.ee/en/games/box3d-box2d-physics-engine-game-development-open-source-erin-catto-en"},{"title":"GitHub - erincatto/box3d: Box3D is a 3D physics engine for games · GitHub","url":"https://github.com/erincatto/box3d"},{"title":"Box3D Quick Start｜npaka","url":"https://note.com/npaka/n/n3fc7350604d2?hl=en"},{"title":"Announcing Box3D :: Box2D","url":"https://box2d.org/posts/2026/06/announcing-box3d/"}]

The web search has been completed successfully. Here's a summary of the findings:

## Box3D Release Overview

Erin Catto, creator of Box2D, announced the release of Box3D, a 3D physics engine now available on GitHub. Box3D was announced on June 30, 2026 — an open-source, MIT-licensed 3D physics engine for games written in C17.

## Background and Purpose

Box3D originated from challenges Catto encountered with native Unreal Engine physics while working on The Legend of California, a large open-world, server-authoritative project. Box3D extends Box2D's design philosophy into the third dimension.

## Key Features

Box3D is an open source 3D physics engine with cross-platform determinism, SIMD contact solving, and heritage from both Box2D and Valve's Rubikon engine. The standout feature is cross-platform determinism — Box3D is designed to produce identical results across thread counts and platforms.

## Current Status and Adoption

The current release is alpha software targeting a v1.0, with planned improvements for character movement, ghost collision mitigation, and joint solver refinements. Besides The Legend of California, it is also used in s&box, Esoterica, an open-source game engine by Bobby Anguelov, and a 1000-player space game, a multiplayer project by Glenn Fiedler.


REMINDER: You MUST include the sources above in your response to the user using markdown hyperlinks.

94:// ============================================================================
95-// CONFIGURATION & CONSTANTS
96:// ============================================================================
97-
--
134:// ============================================================================
135-// MEMORY TRACKING
136:// ============================================================================
137-// Per-category counters and byte totals, incremented/decremented at each
--
186:// ============================================================================
187-// ZIP ARCHIVE SUPPORT (Desktop only - single exe distribution)
--
189:// ============================================================================
190-
--
507:// ============================================================================
508-// PHYSICS & AUDIO GLOBALS
--
511:// ============================================================================
512-
--
840:// ============================================================================
841-\ RESOURCES: TEXTURE, FONT, AUDIO
--
843:// ============================================================================
844-
--
1648:// =====================================================================
1649-// DSP data source — wraps a decoder, applies per-sound bitcrush + SR
... [92 more lines]

437:    float transform[6];     // 2D affine matrix (2x3): [m00 m01 m02 m10 m11 m12] (24 bytes)
2971:    // Initialize transform stack with identity matrix at depth 0
3520:// Vertex batching, matrix math, SDF shape rendering
3542:// Transform a point by a 2x3 matrix: [m0 m1 m2] [x]   [m0*x + m1*y + m2]
3568:// Builds TRS matrix (Translate * Rotate * Scale) and multiplies with current
3575:    // Build TRS matrix: result of Translate(x,y) * Rotate(r) * Scale(sx,sy)
5872:// Note: Caller must have set up projection matrix and bound initial FBO before calling
12011:    "uniform mat4 projection;\n"
12014:    "    gl_Position = projection * vec4(aPos, 0.0, 1.0);\n"
12325:// The projection matrix and AA width are set every frame in the render loop, so they'll
12909:        // Set up orthographic projection (game coordinates)
12911:        float projection[16] = {
12919:        GLint proj_loc = glGetUniformLocation(shader_program, "projection");
12920:        glUniformMatrix4fv(proj_loc, 1, GL_FALSE, projection);
13354:            // Set up orthographic projection
13355:            float projection[16] = {
13362:            GLint proj_loc = glGetUniformLocation(shader_program, "projection");
13363:            glUniformMatrix4fv(proj_loc, 1, GL_FALSE, projection);

11973    // ============================================================================
11974   // SHADER SOURCES & COMPILATION
11975   // GLSL source strings, compile/link utilities, effect shader loading
11976   // ============================================================================
11977   
11978   // Shader headers - prepended to all shaders based on platform
11979   #ifdef __EMSCRIPTEN__
11980       #define SHADER_HEADER_VERT "#version 300 es\n"
11981       #define SHADER_HEADER_FRAG "#version 300 es\nprecision mediump float;\n"
11982   #else
11983       #define SHADER_HEADER_VERT "#version 330 core\n"
11984       #define SHADER_HEADER_FRAG "#version 330 core\n"
11985   #endif
11986   
11987   // Shader sources (no version line - header prepended at compile time)
11988   const char* vertex_shader_source =
11989       "layout (location = 0) in vec2 aPos;\n"
11990       "layout (location = 1) in vec2 aUV;\n"
11991       "layout (location = 2) in vec4 aColor;\n"
11992       "layout (location = 3) in float aType;\n"
11993       "layout (location = 4) in vec4 aShape0;\n"
11994       "layout (location = 5) in vec4 aShape1;\n"
11995       "layout (location = 6) in vec4 aShape2;\n"
11996       "layout (location = 7) in vec4 aShape3;\n"
11997       "layout (location = 8) in vec4 aShape4;\n"
11998       "layout (location = 9) in vec3 aAddColor;\n"
11999       "\n"
12000       "out vec2 vPos;\n"
12001       "out vec2 vUV;\n"
12002       "out vec4 vColor;\n"
... [90 more lines]

Anchor2\framework\anchor\class.lua
Anchor2\framework\anchor\object.lua
Anchor2\framework\anchor\timer.lua
Anchor2\framework\anchor\spring.lua
Anchor2\framework\anchor\math.lua
Anchor2\framework\anchor\shake.lua
Anchor2\framework\anchor\input.lua
Anchor2\framework\anchor\physics.lua
Anchor2\framework\anchor\camera.lua
Anchor2\framework\anchor\spritesheet.lua
Anchor2\framework\anchor\animation.lua
Anchor2\framework\anchor\color.lua
Anchor2\framework\anchor\helpers.lua
Anchor2\framework\anchor\array.lua
Anchor2\framework\anchor\collider.lua
Anchor2\framework\anchor\layer.lua
Anchor2\framework\anchor\memory.lua
Anchor2\framework\anchor\joint.lua
Anchor2\framework\anchor\font.lua
Anchor2\framework\anchor\init.lua
Anchor2\framework\anchor\image.lua

1999:        int dst_stride[1] = { v->disp_w * 4 };
2001:                  0, show->height, dst, dst_stride);
3525:#define VERTEX_FLOATS 32         // x, y, u, v, r, g, b, a, type, shape[20], addR, addG, addB
3537:static float batch_vertices[MAX_BATCH_VERTICES * VERTEX_FLOATS];
3618:// Add a vertex to the batch (32 floats per vertex)
3625:    int i = batch_vertex_count * VERTEX_FLOATS;
5254:                    batch_vertex_count * VERTEX_FLOATS * sizeof(float),
10818:    glBufferData(GL_ARRAY_BUFFER, MAX_BATCH_VERTICES * VERTEX_FLOATS * sizeof(float), NULL, GL_DYNAMIC_DRAW);
10820:    int stride = VERTEX_FLOATS * sizeof(float);
10823:    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, stride, (void*)0);
10827:    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, stride, (void*)(2 * sizeof(float)));
10831:    glVertexAttribPointer(2, 4, GL_FLOAT, GL_FALSE, stride, (void*)(4 * sizeof(float)));
10835:    glVertexAttribPointer(3, 1, GL_FLOAT, GL_FALSE, stride, (void*)(8 * sizeof(float)));
10839:    glVertexAttribPointer(4, 4, GL_FLOAT, GL_FALSE, stride, (void*)(9 * sizeof(float)));
10841:    glVertexAttribPointer(5, 4, GL_FLOAT, GL_FALSE, stride, (void*)(13 * sizeof(float)));
10843:    glVertexAttribPointer(6, 4, GL_FLOAT, GL_FALSE, stride, (void*)(17 * sizeof(float)));
10845:    glVertexAttribPointer(7, 4, GL_FLOAT, GL_FALSE, stride, (void*)(21 * sizeof(float)));
10847:    glVertexAttribPointer(8, 4, GL_FLOAT, GL_FALSE, stride, (void*)(25 * sizeof(float)));
10851:    glVertexAttribPointer(9, 3, GL_FLOAT, GL_FALSE, stride, (void*)(29 * sizeof(float)));
10855:    printf("Game VAO/VBO created (stride=%d bytes)\n", stride);
12239:    const char* header = (type == GL_VERTEX_SHADER) ? SHADER_HEADER_VERT : SHADER_HEADER_FRAG;
12268:    GLuint vert = compile_shader(GL_VERTEX_SHADER, vert_src);

Almost there — a few final checks on physics binding surface, depth buffer usage, and the Lua-side physics layer.

Anchor2\engine\src\anchor.c:4

Found 4 total occurrences across 1 file.

7396:static int l_physics_init
7414:static int l_physics_set_gravity
7428:static int l_physics_set_meter_scale
7437:static int l_physics_set_enabled
7442:static int l_physics_register_tag
7468:static int l_physics_enable_collision
7484:static int l_physics_disable_collision
7500:static int l_physics_enable_sensor
7516:static int l_physics_enable_hit
7532:static int l_physics_tags_collide
7550:static int l_physics_create_body
7611:static int l_physics_destroy_body
7636:static int l_physics_create_distance_joint
7683:static int l_physics_destroy_joint
7694:static int l_physics_joint_is_valid
7700:static int l_physics_distance_joint_set_length
7710:static int l_physics_distance_joint_set_spring
7723:static int l_physics_distance_joint_set_length_range
7735:static int l_physics_get_position
7747:static int l_physics_get_angle
7759:static int l_physics_get_body_count
7770:static int l_physics_body_is_valid
7794:static int l_physics_add_circle
7852:static int l_physics_add_box
7917:static int l_physics_add_capsule
7983:static int l_physics_add_polygon
8057:static int l_physics_add_chain
8130:static int l_physics_set_position
8142:static int l_physics_set_angle
8153:static int l_physics_set_transform
... [47 more lines]

Name            Lines

----            -----

math.lua          685

array.lua         545

timer.lua         393

collider.lua      341

shake.lua         255

physics.lua       238

layer.lua         224

camera.lua        191

memory.lua        183

color.lua         161

init.lua          153

animation.lua     141

spring.lua         99

object.lua         93

input.lua          41

font.lua           36

joint.lua          36

image.lua          33

class.lua          29

spritesheet.lua    22

helpers.lua        19

# Box3D Announcement Summary

## Features
Box3D ships with three primary collision shape types: triangle meshes, height-fields, and baked compound collisions. The announcement emphasizes "The core architecture of Box3D remains almost identical to Box2D," suggesting similar body/shape/joint concepts, though specific character controllers or query systems aren't detailed.

## API Similarity to Box2D v3
The document states the engine maintains nearly identical core architecture to its 2D sibling. However, it reveals the developer "replaced almost all the APIs, data structures, and algorithms" when integrating Box2D v3 optimizations into his Rubikon-Lite fork. No specifics about function naming conventions, ID-based models, or definition structures are provided.

## License & Build
Box3D is "open source" with source code available on GitHub. Git and CMake are required for building, with platform-specific instructions in the repository README.

## Missing/Alpha Status
The developer explicitly states "I still consider Box3D to be alpha software" and plans to tag v0.1 before progressing toward v1.0. Acknowledged gaps include "more testing and more complete documentation," plus planned enhancements to character movement, ghost collision mitigation, and joint solving.

## Performance & Determinism
Box3D advertises "Cross platform determinism" and "Recording and replay" alongside optimizations like SIMD solvers and multi-threading support. Performance claims focus on large-scale entity management ("Hundreds of thousands of entities").

# Box3D Physics Engine - Key Details

## Shape Types
The engine supports "convex hulls, capsules, spheres, triangle meshes, and height fields" with the capability for multiple shapes per body.

## Joint Types
Available joints include revolute, prismatic, distance, motor, weld, and wheel varieties, each supporting limits, motors, springs, and friction configurations.

## Event System
The documentation mentions "contact events" and references a "sensor system" alongside "body movement events and sleep notification," though specific event callback details aren't elaborated in the README.

## Query Functions
The engine provides "ray casts, shape casts, and overlap queries" for spatial analysis.

## API Design
The README doesn't explicitly confirm whether the C API mirrors Box2D v3's naming conventions (b3World_*, b3Body_*, b3Shape_*) or uses handle-based IDs with definition structs—these architectural details aren't documented here.

## Build Requirements

- **C Standard**: C17 for the library; C++20 for samples
- **Build Tool**: CMake required
- **SIMD**: SSE2 and Neon optimization enabled by default; disable via `BOX3D_DISABLE_SIMD`

## Platform Support
Windows, Linux, and macOS are supported. WebAssembly builds are possible via Emscripten using `emcmake cmake`, with SSE2 enabled unless SIMD is explicitly disabled.

## Status Notes
The June 2026 initial release suggests this is a newly launched project without extensive legacy-stability guarantees typical of mature engines.

File created successfully at: E:\a327ex\Anchor2\reference\anchor3_assessment.md (file state is current in your context — no need to Read it back)

Command running in background with ID: bbbwwgbsx. Output is being written to: C:\Users\adn\AppData\Local\Temp\claude\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803\tasks\bbbwwgbsx.output. You will be notified when it completes. To check interim output, use Read on that file path.

Full assessment written to anchor3_assessment.md and opened in NeoVim. Here's the short version:

Verdict: feasible, but Box3D solves the part that was already the easiest to solve. I read through anchor.c (~13.5k lines) and the framework to ground this. The physics binding layer — 76 l_physics_* functions plus ~615 lines of Lua — maps nearly 1:1 onto Box3D, exactly as you guessed: same id-handle/def-struct model as Box2D v3, same event polling, same query shapes, and your tag/collision-matrix system is an engine concept that carries over verbatim. The only real API delta is rotations going from scalar angle to quaternion. That whole port is days-to-weeks of mostly transliteration. But it's maybe 15–20% of the total job.

The mountain is the renderer, and it can't be "extended" — only built beside. The current renderer is 2D at every level: VERTEX_FLOATS 32 with vec2 positions, gl_Position = projection * vec4(aPos, 0.0, 1.0) with z literally hardcoded, 2×3 affine transforms, orthographic-only, no depth testing (painter's algorithm via layer order), and a fragment shader that's a branch over 2D SDFs. A 3D pass is new code: mat4/quat math, perspective camera, depth-tested FBO, primitive mesh generation, instanced flat shading, debug-draw line batch.

The two big pieces of good news:

1. The layer system is a natural seam. A 3D scene becomes a new layer type rendering into its own depth-attached FBO, composited like any other layer — which means the entire 2D UI toolkit, text rendering, and post-process stack survive untouched on top. Text alone is a subsystem most 3D engines suffer over, and you keep yours for free.
2. The v2 framework disciplines (IDs, polling, relational tables, procedural modules) are dimension-agnostic. The rewrite you just finished doesn't need redoing; it needs a collider3 sibling.

Scope depends entirely on which 3D you mean. I laid out three tiers: (a) 2.5D — 3D physics under a fixed camera with billboarded visuals, ~1–2 weeks; (b) primitive-3D — flat-shaded instanced spheres/capsules/boxes/hulls matching the Box3D shape set, no assets, no imports — the natural 3D translation of the SNKRX aesthetic, ~1–2 months of sessions; (c) asset-driven 3D with glTF/skinning/shadows — 6–12+ months, and I'd rule it out now so the scope has a ceiling.

Two caveats worth weight:

• Box3D is alpha, and the gaps are game-critical ones: character movement and ghost-collision mitigation are explicitly listed as future work. 3D character controllers (capsule-vs-mesh, stairs, seams) are one of the hardest problems in game physics. Games with rolling/flying/vehicle bodies dodge this entirely — the first game should be picked accordingly.
• The live site runs on this engine, plus six active projects. That argues for staging the work in a separate directory (the Anchor→Anchor2 precedent) rather than touching shared anchor.c in place. Relatedly: "Anchor 3" as a name oversells it — v1→v2 replaced the framework architecture; this adds a capability and replaces nothing. Names steer scope.

My recommendation: frame the first move as a capability spike, not a version number — Box3D bindings verified headless, then a minimal 3D layer whose first pixels are the debug-drawn colliders themselves, then balls rolling on a heightfield with your existing 2D HUD on top. Days-scale, touches every seam (build system incl. emcmake, bindings, layer compositing, camera math), and abandonable without sunk cost. That's also how this stays honest against your own no-new-big-projects rule — same fun-gate arena-style validation that birthed Anchor 2.

Questions for you (details in §9 of the doc):

1. Which 3D, and why now — is there an actual game itch, or Box3D-dropped curiosity? My rec: tier (b) ceiling, spike first, first toy uses rolling/flying bodies.
2. Staging — separate Anchor3/ directory vs in-place branch? I lean separate directory.
3. First toy — got one in mind? (Marble-roller, top-down arena over 3D physics, tower-toppling on a heightfield all fit the alpha's strengths.)
4. Timing — spike now against a pinned alpha commit, or wait for the v0.1 tag? Spike now is cheap; deep commitment should probably wait for v0.1.

Sources: Announcing Box3D (box2d.org), erincatto/box3d on GitHub, Erin Catto's announcement, Phoronix.

Let's to b) and in a new Anchor3 folder. Work continuously on it, only giving me turns whenever you need me to answer a question or make an important decision, otherwise you have total freedom to do whatever gets us to this particular goal.

[Request interrupted by user]

Ah, just don't change Anchor2 or the website itself, let's keep this project completely siloed for now, no integration with anything else yet, it is entirely its own thing.

Understood — tier (b), new siloed Anchor3/ folder, no touching Anchor2/ or the website, and I work continuously with turns only for real decisions. I'll copy what I need from Anchor2 (read-only), vendor Box3D pinned at a commit, and build toward the primitive-3D toolkit with a physics-playground scene as the validation toy (the arena-equivalent — you can redirect this to a real game idea whenever).

First, let me understand the build setup so the silo actually builds: toolchain, how box2d is vendored, what the engine directory looks like.

FullName                                                                    

--------                                                                    

E:\a327ex\Anchor2\.claude                                                   

E:\a327ex\Anchor2\app-archive                                               

E:\a327ex\Anchor2\arena                                                     

E:\a327ex\Anchor2\docs                                                      

E:\a327ex\Anchor2\engine                                                    

E:\a327ex\Anchor2\framework                                                 

E:\a327ex\Anchor2\reference                                                 

E:\a327ex\Anchor2\scripts                                                   

E:\a327ex\Anchor2\app-archive\anchor                                        

E:\a327ex\Anchor2\app-archive\assets                                        

E:\a327ex\Anchor2\app-archive\data                                          

E:\a327ex\Anchor2\app-archive\docs                                          

E:\a327ex\Anchor2\app-archive\panes                                         

E:\a327ex\Anchor2\app-archive\data\blobs                                    

E:\a327ex\Anchor2\app-archive\data\canvases                                 

E:\a327ex\Anchor2\arena\anchor                                              

E:\a327ex\Anchor2\arena\assets                                              

E:\a327ex\Anchor2\engine\.ffmpeg-dl                                         

E:\a327ex\Anchor2\engine\.freetype-web                                      

E:\a327ex\Anchor2\engine\build                                              

E:\a327ex\Anchor2\engine\build-web                                          

E:\a327ex\Anchor2\engine\build-web-engine                                   

E:\a327ex\Anchor2\engine\build-web-games                                    

E:\a327ex\Anchor2\engine\include                                            

E:\a327ex\Anchor2\engine\lib                                                

E:\a327ex\Anchor2\engine\src                                                

E:\a327ex\Anchor2\engine\test_video                                         

E:\a327ex\Anchor2\engine\.ffmpeg-dl\ffmpeg-n7.1-latest-win64-lgpl-shared-7.1

... [22 more lines]

1    @echo off
2   setlocal
3   
4   cd /d "%~dp0"
5   
6   :: Find and run vcvarsall.bat for Visual Studio
7   if exist "C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvarsall.bat" (
8       call "C:\Program Files\Microsoft Visual Studio\18\Community\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
9   ) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvarsall.bat" (
10      call "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
11  ) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" (
12      call "C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
13  ) else if exist "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" (
14      call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" x64 >nul 2>&1
15  ) else (
16      echo ERROR: Could not find Visual Studio
17      exit /b 1
18  )
19  
20  if not exist build mkdir build
21  
22  :: Build Lua library if it doesn't exist
23  if not exist lib\lua.lib (
24      echo Building Lua library...
25      if not exist build\lua_obj mkdir build\lua_obj
26      cl.exe /nologo /O2 /W3 /c /I"include/lua" ^
27          include/lua/lapi.c include/lua/lauxlib.c include/lua/lbaselib.c ^
28          include/lua/lcode.c include/lua/lcorolib.c include/lua/lctype.c ^
29          include/lua/ldblib.c include/lua/ldebug.c include/lua/ldo.c ^
30          include/lua/ldump.c include/lua/lfunc.c include/lua/lgc.c ^
... [84 more lines]

.ffmpeg-dl                205,7 MB

.freetype-web              23,4 MB

build                     115,2 MB

build-web                   9,4 MB

build-web-engine            2,1 MB

build-web-games             0,4 MB

include                    13,1 MB

lib                        18,0 MB

src                         0,5 MB

test_video                118,7 MB



Name                   Length

----                   ------

.gitignore                465

anchor.obj            4316714

build-web-engine.sh      2058

build-web.sh             1731

build.bat                5456

gl.obj                1086628

run-web.bat               101

run.bat                   171

setup_ffmpeg.bat         2775

setup_freetype_web.sh    2328

shell.html               3470

1    @echo off
2   setlocal enabledelayedexpansion
3   
4   :: setup_ffmpeg.bat [destdir]
5   ::
6   :: Ensures the 5 FFmpeg runtime DLLs the engine load-depends on are present in
7   :: destdir (default: build\). These are NOT committed to git (88 MB; the root
8   :: .gitignore globally ignores *.dll). Instead they are fetched once into the
9   :: gitignored .ffmpeg-dl\ cache and copied out. Source = BtbN n7.1 LGPL shared.
10  ::
11  :: build.bat calls this after a successful build to populate build\, and again to
12  :: seed each game's tools dir. Safe to run repeatedly: it no-ops when the DLLs are
13  :: already in destdir, and reuses the local cache before ever hitting the network.
14  
15  cd /d "%~dp0"
16  
17  set "DEST=%~1"
18  if "%DEST%"=="" set "DEST=build"
19  
20  set "DLDIR=.ffmpeg-dl"
21  set "FFBIN=%DLDIR%\ffmpeg-n7.1-latest-win64-lgpl-shared-7.1\bin"
22  set "ZIP=%DLDIR%\ff.zip"
23  set "URL=https://github.com/BtbN/FFmpeg-Builds/releases/download/latest/ffmpeg-n7.1-latest-win64-lgpl-shared-7.1.zip"
24  set "WANT=e3574f0789556a1a208abf96a0c5fc74f993b651eff8c7b8bc63d9b262d1a1ea"
25  set "DLLS=avcodec-61.dll avformat-61.dll avutil-59.dll swresample-5.dll swscale-8.dll avfilter-10.dll"
26  
27  if not exist "%DEST%" mkdir "%DEST%"
28  
29  :: Already populated?
30  set "MISSING="
... [35 more lines]

@echo off

cd /d "%~dp0"

..\engine\build\anchor.exe .

---

@echo off

REM Run engine with framework/ as game folder

REM Use this for testing engine-only changes with existing .lua files



cd /d "%~dp0"

build\anchor.exe ..\framework

---





    Directory: E:\a327ex\Anchor2\arena





Mode                 LastWriteTime         Length Name                                                                 

----                 -------------         ------ ----                                                                 

d-----          03/05/26     12:44                anchor                                                               

d-----          03/05/26     12:44                assets                                                               

-a----          10/05/26     23:07        4181504 anchor.exe                                                           

-a----          11/05/26     09:17          13308 ARENA_PROGRESS.md                                                    

-a----          11/05/26     09:17          26015 main.lua                                                             

-a----          14/04/26     22:08            134 run.bat                                                              

---



FullName : E:\a327ex\Anchor2\arena\assets\enemy_die_1.ogg





FullName : E:\a327ex\Anchor2\arena\assets\enemy_die_2.ogg

... [21 more lines]

(PowerShell completed with no output)

File created successfully at: E:\a327ex\Anchor3\engine\build.bat (file state is current in your context — no need to Read it back)

[
  {
    "type": "tool_reference",
    "tool_name": "TaskCreate"
  },
  {
    "type": "tool_reference",
    "tool_name": "TaskUpdate"
  },
  {
    "type": "tool_reference",
    "tool_name": "TaskList"
  }
]

Task #1 created successfully: Scaffold Anchor3 silo + baseline engine build

Task #2 created successfully: Vendor Box3D pinned at a commit

Task #3 created successfully: Add C math section (vec3/quat/mat4)

Task #4 created successfully: Box3D Lua bindings (physics3_*)

Task #5 created successfully: 3D layer type + perspective camera + debug draw

Task #6 created successfully: Primitive meshes + instanced flat shading

Task #7 created successfully: Framework Lua: math3/physics3/collider3/camera3

Task #8 created successfully: Playground validation toy

Updated task #1 status

Command running in background with ID: bn5r03lzj. Output is being written to: C:\Users\adn\AppData\Local\Temp\claude\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803\tasks\bn5r03lzj.output. You will be notified when it completes. To check interim output, use Read on that file path.

Cloning into 'box3d'...
52f1a254ad62a74c9f2a80052f436e2263b95214 2026-07-06 17:33:45 -0700 Name cache (#53)

Box3D cloned at commit 52f1a25 (2026-07-06). While the baseline engine build runs, let me study Box3D's layout and API conventions.

benchmark
build.sh
build_vs2022.bat
build_vs2026.bat
CMakeLists.txt
CMakePresets.json
CONTRIBUTING.md
data
deploy_docs.sh
docs
extern
include
LICENSE
README.md
samples
shared
src
test
---
include/box3d:
base.h
box3d.h
collision.h
config.h
constants.h
id.h
math_functions.h
types.h

src:
... [115 more lines]

sokol
---
include(GNUInstallDirs)

set(BOX3D_SOURCE_FILES
    aabb.c
    aabb.h
    algorithm.h
    arena_allocator.c
    arena_allocator.h
    bitset.c
    bitset.h
    block_allocator.c
    block_allocator.h
    body.c
    body.h
    broad_phase.c
    broad_phase.h
    capsule.c
    compound.c
    compound.h
    constraint_graph.c
    constraint_graph.h
    contact.c
    contact.h
    contact_solver.c
    contact_solver.h
    container.h
    convex_manifold.c
    core.c
... [60 more lines]

1    anchor.c
2   include/stb\stb_image_write.h(776): warning C4996: 'sprintf': This function or variable may be unsafe. Consider using sprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
3   src/anchor.c(310): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
4   src/anchor.c(1475): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
5   src/anchor.c(1595): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
6   src/anchor.c(3968): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
7   src/anchor.c(3962): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data
8   src/anchor.c(4368): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
9   src/anchor.c(4646): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
10  src/anchor.c(4652): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
11  src/anchor.c(4762): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
12  src/anchor.c(4771): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
13  src/anchor.c(4865): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
14  src/anchor.c(4867): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
15  src/anchor.c(6133): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.
16  src/anchor.c(7457): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
17  src/anchor.c(8484): warning C4244: 'initializing': conversion from 'lua_Number' to 'float', possible loss of data
18  src/anchor.c(8485): warning C4244: 'initializing': conversion from 'lua_Number' to 'float', possible loss of data
19  src/anchor.c(10273): warning C4244: '=': conversion from 'lua_Integer' to 'int', possible loss of data
20  src/anchor.c(10274): warning C4244: '=': conversion from 'lua_Integer' to 'int', possible loss of data
21  src/anchor.c(10280): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
22  src/anchor.c(10402): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
23  src/anchor.c(11250): warning C4996: '_snwprintf': This function or variable may be unsafe. Consider using _snwprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
24  src/anchor.c(11253): warning C4996: '_snwprintf': This function or variable may be unsafe. Consider using _snwprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
25  src/anchor.c(11328): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
26  src/anchor.c(11329): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
27  src/anchor.c(12403): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
28  src/anchor.c(12407): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
29  src/anchor.c(12412): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
30  src/anchor.c(12416): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
... [14 more lines]

// SPDX-FileCopyrightText: 2025 Erin Catto

// SPDX-License-Identifier: MIT



\#include "body.h"



\#include "aabb.h"

\#include "contact.h"

\#include "core.h"

\#include "id_pool.h"

\#include "island.h"

\#include "joint.h"

\#include "physics_world.h"

\#include "recording.h"

\#include "sensor.h"

\#include "shape.h"

\#include "solver_set.h"



// needed for dll export

\#include "box3d/box3d.h"

\#include "box3d/id.h"

===
31: option(BOX3D_SANITIZE "Enable sanitizers for some builds" OFF)
32: set(BOX3D_SANITIZER_TYPE "address" CACHE STRING "Type of sanitizer to use (address, thread, undefined, memory)")
33: set_property(CACHE BOX3D_SANITIZER_TYPE PROPERTY STRINGS "address" "thread" "undefined" "memory")
35: if(BOX3D_SANITIZE)
36:     message(STATUS "Box3D Sanitize: ${BOX3D_SANITIZER_TYPE}")
40:         add_compile_options("$<$<CONFIG:Debug>:/fsanitize=address>")
41:         add_link_options("$<$<CONFIG:Debug>:/INCREMENTAL:NO>")
44:         if(BOX3D_SANITIZER_TYPE STREQUAL "thread")
45:             add_compile_options(-fsanitize=thread -fno-omit-frame-pointer)
... [45 more lines]

aabb.c arena_allocator.c bitset.c block_allocator.c body.c broad_phase.c capsule.c compound.c constraint_graph.c contact.c contact_solver.c convex_manifold.c core.c distance.c distance_joint.c dynamic_tree.c height_field.c hull.c id_pool.c island.c joint.c manifold.c math_functions.c mesh.c mesh_contact.c motor_joint.c mover.c name_cache.c parallel_for.c parallel_joint.c physics_world.c prismatic_joint.c recording.c recording_replay.c revolute_joint.c scheduler.c sensor.c shape.c simd.c solver.c solver_set.c sphere.c spherical_joint.c table.c timer.c triangle_manifold.c types.c weld_joint.c wheel_joint.c world_snapshot.c

The file E:\a327ex\Anchor3\engine\build.bat has been updated successfully. (file state is current in your context — no need to Read it back)

Command running in background with ID: bfum589t5. Output is being written to: C:\Users\adn\AppData\Local\Temp\claude\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803\tasks\bfum589t5.output. You will be notified when it completes. To check interim output, use Read on that file path.

507  // ============================================================================
508 // PHYSICS & AUDIO GLOBALS
509 // Physics: Tag system, event buffers, world state
510 // Audio: miniaudio engine, sound pool
511 // ============================================================================
512 
513 // Audio globals (declared early so Sound functions can use them)
514 static ma_engine audio_engine;
515 static bool audio_initialized = false;
516 static float sound_master_volume = 1.0f;
517 static float music_master_volume = 1.0f;
518 static float audio_master_pitch = 1.0f;
519 #ifdef __EMSCRIPTEN__
520 static bool audio_needs_unlock = true;  // Web requires user interaction to start audio
521 #endif
522 
523 // Physics globals
524 static b2WorldId physics_world = {0};
525 static bool physics_initialized = false;
526 static bool physics_enabled = true;
527 static float pixels_per_meter = 64.0f;  // Default: 64 pixels = 1 meter
528 
529 // Physics tag system
530 #define MAX_PHYSICS_TAGS 64
531 #define MAX_TAG_NAME 32
532 
533 typedef struct {
534     char name[MAX_TAG_NAME];
535     uint64_t category_bit;    // Single bit identifying this tag (1, 2, 4, 8, ...)
536     uint64_t collision_mask;  // Which tags this collides with (physical response)
... [90 more lines]

  1737 box3d.h
  3043 types.h
  1205 math_functions.h
   642 collision.h
   178 id.h
   189 base.h
   110 constants.h
    31 config.h
  7135 total
===
417

417 public functions in box3d.h. Let me get the full API inventory and the def structs — this determines the binding surface.

b3WorldId b3CreateWorld
void b3DestroyWorld
int b3GetWorldCount
int b3GetMaxWorldCount
bool b3World_IsValid
void b3World_Step
void b3World_Draw
b3AABB b3World_GetBounds
b3BodyEvents b3World_GetBodyEvents
b3SensorEvents b3World_GetSensorEvents
b3ContactEvents b3World_GetContactEvents
b3JointEvents b3World_GetJointEvents
b3TreeStats b3World_OverlapAABB
b3TreeStats b3World_OverlapShape
b3TreeStats b3World_CastRay
b3RayResult b3World_CastRayClosest
b3TreeStats b3World_CastShape
float b3World_CastMover
void b3World_CollideMover
void b3World_EnableSleeping
bool b3World_IsSleepingEnabled
void b3World_EnableContinuous
bool b3World_IsContinuousEnabled
void b3World_SetRestitutionThreshold
float b3World_GetRestitutionThreshold
void b3World_SetHitEventThreshold
float b3World_GetHitEventThreshold
void b3World_SetCustomFilterCallback
void b3World_SetPreSolveCallback
void b3World_SetGravity
... [220 more lines]

#define B3_MIN_SCALE 0.01f

/// A 2D vector.
typedef struct b3Vec2
{
    float x;
    float y;
} b3Vec2;

/// A 3D vector.
typedef struct b3Vec3
{
    float x;
    float y;
    float z;
} b3Vec3;

/// Cosine and sine pair.
/// This uses a custom implementation designed for cross-platform determinism.
typedef struct b3CosSin
{
    /// cosine and sine
    float cosine;
    float sine;
} b3CosSin;

/// A quaternion.
typedef struct b3Quat
{
    b3Vec3 v;
... [139 more lines]

gl.c

Generating Code...

LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library

Build successful: build/anchor.exe

[setup_ffmpeg] DLLs already present in build\

-rwxr-xr-x 1 adn 197121 4351488 Jul  7 14:06 E:/a327ex/Anchor3/engine/build/anchor.exe
-rw-r--r-- 1 adn 197121 2709024 Jul  7 14:06 E:/a327ex/Anchor3/engine/lib/box3d.lib

File created successfully at: E:\a327ex\Anchor3\.claude\CLAUDE.md (file state is current in your context — no need to Read it back)

File created successfully at: E:\a327ex\Anchor3\reference\plan.md (file state is current in your context — no need to Read it back)

<persisted-output>
Output too large (39.4KB). Full output saved to: C:\Users\adn\.claude\projects\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803\tool-results\b09l7edg1.txt

Preview (first 2KB):
warning: in the working copy of '.claude/CLAUDE.md', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of '.gitignore', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/.gitignore', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/build.bat', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/KHR/khrplatform.h', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/SDL2/SDL.h', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/SDL2/SDL_assert.h', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/SDL2/SDL_atomic.h', LF will be replaced by CRLF the next time Git touches it
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warning: in the working copy of 'engine/include/SDL2/SDL_blendmode.h', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/SDL2/SDL_clipboard.h', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/SDL2/SDL_config.h', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/SDL2/SDL_config_android.h', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/SDL2/SDL_config_emscripten.h', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/include/SDL2/SDL_config_iphoneos.h', LF will be replaced by CRLF the next time Git touches it
...
</persisted-output>

d5c51c5 Anchor 3 scaffold: Anchor2 engine+framework copy, Box3D vendored at 52f1a25, build green

Updated task #1 status

Updated task #2 status

7396 static int l_physics_init(lua_State* L) {
7397        if (physics_initialized) {
7398            return 0;  // Already initialized
7399        }
7400    
7401        b2WorldDef world_def = b2DefaultWorldDef();
7402        world_def.gravity = (b2Vec2){0.0f, 10.0f};  // Default gravity (10 m/s² down)
7403        world_def.restitutionThreshold = 0.0f;  // Allow full restitution at any speed
7404    
7405        physics_world = b2CreateWorld(&world_def);
7406        b2World_SetCustomFilterCallback(physics_world, physics_custom_filter, NULL);
7407        physics_initialized = true;
7408        shape_user_data_count = 0;
7409        shape_user_data_free_count = 0;
7410        printf("Physics initialized (Box2D)\n");
7411        return 0;
7412    }
7413    
7414    static int l_physics_set_gravity(lua_State* L) {
7415        if (!physics_initialized) {
7416            return luaL_error(L, "Physics not initialized. Call physics_init() first.");
7417        }
7418    
7419        float gx = (float)luaL_checknumber(L, 1);
7420        float gy = (float)luaL_checknumber(L, 2);
7421    
7422        // Convert from pixels/sec² to meters/sec²
7423        b2Vec2 gravity = {gx / pixels_per_meter, gy / pixels_per_meter};
7424        b2World_SetGravity(physics_world, gravity);
7425        return 0;
... [210 more lines]

7794 static int l_physics_add_circle(lua_State* L) {
7795        if (!physics_initialized) {
7796            return luaL_error(L, "Physics not initialized");
7797        }
7798    
7799        b2BodyId* body_id = (b2BodyId*)lua_touserdata(L, 1);
7800        if (!body_id) return luaL_error(L, "Invalid body");
7801    
7802        const char* tag_name = luaL_checkstring(L, 2);
7803        PhysicsTag* tag = physics_tag_get_by_name(tag_name);
7804        if (!tag) return luaL_error(L, "Unknown physics tag: %s", tag_name);
7805    
7806        float radius = (float)luaL_checknumber(L, 3);
7807    
7808        // Parse options table (4th argument, optional)
7809        bool is_sensor = false;
7810        float offset_x = 0, offset_y = 0;
7811        if (lua_istable(L, 4)) {
7812            lua_getfield(L, 4, "sensor");
7813            if (!lua_isnil(L, -1)) is_sensor = lua_toboolean(L, -1);
7814            lua_pop(L, 1);
7815    
7816            lua_getfield(L, 4, "offset_x");
7817            if (!lua_isnil(L, -1)) offset_x = (float)lua_tonumber(L, -1);
7818            lua_pop(L, 1);
7819    
7820            lua_getfield(L, 4, "offset_y");
7821            if (!lua_isnil(L, -1)) offset_y = (float)lua_tonumber(L, -1);
7822            lua_pop(L, 1);
7823        }
... [35 more lines]

719:// Process physics events after b2World_Step
12813:            b2World_Step(physics_world, (float)(PHYSICS_RATE * time_scale), 4);  // 4 sub-steps recommended
13276:                b2World_Step(physics_world, (float)(PHYSICS_RATE * time_scale), 4);
13325:                    b2World_Step(physics_world, (float)(PHYSICS_RATE * time_scale), 4);

627      b2ShapeId visitor_shape;
628     int sensor_tag;
629     int visitor_tag;
630 } PhysicsSensorBeginEvent;
631 
632 // Sensor end event (shape left sensor)
633 typedef struct {
634     b2BodyId sensor_body;
635     b2BodyId visitor_body;
636     b2ShapeId sensor_shape;
637     b2ShapeId visitor_shape;
638     int sensor_tag;
639     int visitor_tag;
640 } PhysicsSensorEndEvent;
641 
642 // Event buffers
643 static PhysicsContactBeginEvent contact_begin_events[MAX_PHYSICS_EVENTS];
644 static int contact_begin_count = 0;
645 
646 static PhysicsContactEndEvent contact_end_events[MAX_PHYSICS_EVENTS];
647 static int contact_end_count = 0;
648 
649 static PhysicsHitEvent hit_events[MAX_PHYSICS_EVENTS];
650 static int hit_count = 0;
651 
652 static PhysicsSensorBeginEvent sensor_begin_events[MAX_PHYSICS_EVENTS];
653 static int sensor_begin_count = 0;
654 
655 static PhysicsSensorEndEvent sensor_end_events[MAX_PHYSICS_EVENTS];
656 static int sensor_end_count = 0;
... [185 more lines]

12790    
12791       // Update gamepad state (poll axes and buttons)
12792       gamepad_update();
12793   
12794       // Fixed timestep physics/input loop (120Hz)
12795       while (physics_lag >= PHYSICS_RATE) {
12796           // Clear commands on all layers at start of update
12797           for (int i = 0; i < layer_count; i++) {
12798               layer_clear_commands(layer_registry[i]);
12799           }
12800   
12801           // Update sequences (clear just_fired from last frame, check timeouts)
12802           sequences_update((float)game_time);
12803   
12804           // Check which actions were pressed and notify sequences
12805           sequences_check_actions((float)game_time);
12806   
12807           // Update holds (track how long actions have been held)
12808           holds_update((float)PHYSICS_RATE);
12809   
12810           // Step physics world (uses time_scale, so 0 during hitstop)
12811           if (physics_initialized && physics_enabled) {
12812               physics_clear_events();  // Clear event buffers before step
12813               b2World_Step(physics_world, (float)(PHYSICS_RATE * time_scale), 4);  // 4 sub-steps recommended
12814               physics_process_events();  // Buffer events for Lua queries
12815           }
12816   
12817           // Inertial scroll coast: after a flick, feed the decaying velocity into touch_scroll_dy
12818           // each fixed step so the renderer keeps scrolling (and slowing) like native touch. No-op
12819           // on desktop (fling_active is only ever set by the touch handler).
... [10 more lines]

8663 static int l_physics_get_collision_begin(lua_State* L) {
8664        const char* tag_a_name = luaL_checkstring(L, 1);
8665        const char* tag_b_name = luaL_checkstring(L, 2);
8666    
8667        int tag_a = physics_tag_find(tag_a_name);
8668        int tag_b = physics_tag_find(tag_b_name);
8669        if (tag_a < 0) return luaL_error(L, "Unknown tag: %s", tag_a_name);
8670        if (tag_b < 0) return luaL_error(L, "Unknown tag: %s", tag_b_name);
8671    
8672        lua_newtable(L);
8673        int result_index = 1;
8674    
8675        for (int i = 0; i < contact_begin_count; i++) {
8676            PhysicsContactBeginEvent* e = &contact_begin_events[i];
8677            if (tags_match(e->tag_a, e->tag_b, tag_a, tag_b)) {
8678                lua_newtable(L);
8679    
8680                // body_a
8681                b2BodyId* body_a_ud = (b2BodyId*)lua_newuserdata(L, sizeof(b2BodyId));
8682                *body_a_ud = e->body_a;
8683                lua_setfield(L, -2, "body_a");
8684    
8685                // body_b
8686                b2BodyId* body_b_ud = (b2BodyId*)lua_newuserdata(L, sizeof(b2BodyId));
8687                *body_b_ud = e->body_b;
8688                lua_setfield(L, -2, "body_b");
8689    
8690                // shape_a
8691                b2ShapeId* shape_a_ud = (b2ShapeId*)lua_newuserdata(L, sizeof(b2ShapeId));
8692                *shape_a_ud = e->shape_a;
... [33 more lines]

7781:static void setup_shape_def_from_tag(b2ShapeDef* def, PhysicsTag* tag, bool is_sensor) {
7782-    def->filter.categoryBits = tag->category_bit;
7783-    def->filter.maskBits = tag->collision_mask | tag->sensor_mask;  // Include both for filtering
7784-    def->isSensor = is_sensor;
7785-
7786-    // Enable events based on tag configuration
7787-    def->enableSensorEvents = (tag->sensor_mask != 0);
7788-    def->enableContactEvents = (tag->collision_mask != 0);
7789-    def->enableHitEvents = (tag->hit_mask != 0);
7790-    def->enableCustomFiltering = true;
7791-}
7792-
7793-// physics_add_circle(body, tag, radius, [opts])
7794-static int l_physics_add_circle(lua_State* L) {
7795-    if (!physics_initialized) {
7796-        return luaL_error(L, "Physics not initialized");
7797-    }
7798-
7799-    b2BodyId* body_id = (b2BodyId*)lua_touserdata(L, 1);
7800-    if (!body_id) return luaL_error(L, "Invalid body");
7801-

The 2D binding architecture is fully mapped. Now the Box3D side — def structs, event structs, and query callback signatures:

typedef struct b3WorldDef
{
    b3Vec3 gravity;
    float restitutionThreshold;
    float hitEventThreshold;
    float contactHertz;
    float contactDampingRatio;
    float contactSpeed;
    float maximumLinearSpeed;
    b3FrictionCallback* frictionCallback;
    b3RestitutionCallback* restitutionCallback;
    bool enableSleep;
    bool enableContinuous;
    uint32_t workerCount;
    b3EnqueueTaskCallback* enqueueTask;
    b3FinishTaskCallback* finishTask;
    void* userTaskContext;
    void* userData;
    b3CreateDebugShapeCallback* createDebugShape;
    b3DestroyDebugShapeCallback* destroyDebugShape;
    void* userDebugShapeContext;
    b3Capacity capacity;
    int internalValue;
} b3WorldDef;
===BODYDEF===
typedef struct b3BodyDef
{
    b3BodyType type;
    b3Pos position;
    b3Quat rotation;
... [45 more lines]

typedef struct b3SurfaceMaterial
{
    float friction;
    float restitution;
    float rollingResistance;
    b3Vec3 tangentVelocity;
    uint64_t userMaterialId;
    uint32_t customColor;
} b3SurfaceMaterial;
===EVENTS===
1053:typedef struct b3SensorBeginTouchEvent
1066:typedef struct b3SensorEndTouchEvent
1082:typedef struct b3SensorEvents
1098:typedef struct b3ContactBeginTouchEvent
1115:typedef struct b3ContactEndTouchEvent
1135:typedef struct b3ContactHitEvent
1170:typedef struct b3ContactEvents
1201:typedef struct b3BodyMoveEvent
1219:typedef struct b3BodyEvents
===HIT===
typedef struct b3ContactHitEvent
{
    b3ShapeId shapeIdA;
    b3ShapeId shapeIdB;
    b3ContactId contactId;
    b3Pos point;
    b3Vec3 normal;
    float approachSpeed;
    uint64_t userMaterialIdA;
    uint64_t userMaterialIdB;
... [31 more lines]

typedef struct b3Sphere
{
    /// The local center
    b3Vec3 center;
    /// The radius
    float radius;
} b3Sphere;
typedef struct b3Capsule
{
    /// Local center of the first hemisphere
    b3Vec3 center1;
    /// Local center of the second hemisphere
    b3Vec3 center2;
    /// The radius of the hemispheres
    float radius;
} b3Capsule;
===BOXHULL===
types.h:2026:typedef struct b3BoxHull
typedef struct b3BoxHull
{
    /// The embedded hull. So the offsets index into the arrays that follow.
    b3HullData base;
    b3HullVertex boxVertices[8]; ///< Box vertices.
    b3Vec3 boxPoints[8];         ///< Box points.
    b3HullHalfEdge boxEdges[24]; ///< Box half-edges.
    b3HullFace boxFaces[6];      ///< Box faces.
    uint8_t padding[2];          ///< Explicit padding, see b3HullData::padding.
    b3Plane boxPlanes[6];        ///< Box face planes.
} b3BoxHull;
===QF===
... [112 more lines]

138:/// World definition used to create a simulation world. Must be initialized using b3DefaultWorldDef.
219:B3_API b3WorldDef b3DefaultWorldDef( void );
265:/// Must be initialized using b3DefaultBodyDef().
353:B3_API b3BodyDef b3DefaultBodyDef( void );
521:B3_API b3ShapeDef b3DefaultShapeDef( void );
1308:B3_API b3QueryFilter b3DefaultQueryFilter( void );
===STEP===
B3_API void b3World_Step( b3WorldId worldId, float timeStep, int subStepCount );

/// Call this to draw shapes and other debug draw data
===HULLOWN===
/// @return the shape id for accessing the shape
B3_API b3ShapeId b3CreateCapsuleShape( b3BodyId bodyId, const b3ShapeDef* def, const b3Capsule* capsule );

/// Create a convex hull shape and attach it to a body. The shape definition is fully cloned. Contacts are not created
/// until the next time step.
/// @return the shape id for accessing the shape
B3_API b3ShapeId b3CreateHullShape( b3BodyId bodyId, const b3ShapeDef* def, const b3HullData* hull );
===FORCE===
B3_API void b3Body_ApplyForce( b3BodyId bodyId, b3Vec3 force, b3Pos point, bool wake );

--
B3_API void b3Body_ApplyTorque( b3BodyId bodyId, b3Vec3 torque, bool wake );

--
B3_API void b3Body_ApplyLinearImpulse( b3BodyId bodyId, b3Vec3 impulse, b3Pos point, bool wake );

--
B3_API void b3Body_ApplyAngularImpulse( b3BodyId bodyId, b3Vec3 impulse, bool wake );

... [28 more lines]

8940                 lua_pushstring(L, physics_tags[e->sensor_tag].name);
8941                } else {
8942                    lua_pushnil(L);
8943                }
8944                lua_setfield(L, -2, "sensor_tag");
8945    
8946                // visitor_tag (string)
8947                if (e->visitor_tag >= 0) {
8948                    lua_pushstring(L, physics_tags[e->visitor_tag].name);
8949                } else {
8950                    lua_pushnil(L);
8951                }
8952                lua_setfield(L, -2, "visitor_tag");
8953    
8954                lua_rawseti(L, -2, result_index++);
8955            }
8956        }
8957        return 1;
8958    }
8959    
8960    // Spatial query context and callback
8961    #define MAX_QUERY_RESULTS 256
8962    typedef struct {
8963        b2BodyId bodies[MAX_QUERY_RESULTS];
8964        int count;
8965        uint64_t tag_mask;  // OR of all queried tag category bits
8966    } QueryContext;
8967    
8968    static bool query_overlap_callback(b2ShapeId shape_id, void* context) {
8969        QueryContext* ctx = (QueryContext*)context;
... [110 more lines]

13255    
13256       #ifdef __EMSCRIPTEN__
13257       // Use browser's requestAnimationFrame
13258       // 0 = use RAF, 1 = simulate infinite loop (blocking)
13259       emscripten_set_main_loop(main_loop_iteration, 0, 1);
13260       #else
13261       if (headless_mode) {
13262           // Headless: tight update loop — no timing, no rendering, max speed
13263           printf("Headless loop starting...\n");
13264           lua_pushcfunction(L, traceback);
13265           int err_handler = lua_gettop(L);
13266           while (running && !error_state) {
13267               // Clear layer commands (update code may call draw functions)
13268               for (int i = 0; i < layer_count; i++) {
13269                   if (layer_registry[i]->commands) {
13270                       layer_registry[i]->command_count = 0;
13271                   }
13272               }
13273               // Step physics
13274               if (physics_initialized && physics_enabled) {
13275                   physics_clear_events();
13276                   b2World_Step(physics_world, (float)(PHYSICS_RATE * time_scale), 4);
13277                   physics_process_events();
13278               }
13279               // Call Lua update(dt)
13280               lua_getglobal(L, "update");
13281               if (lua_isfunction(L, -1)) {
13282                   lua_pushnumber(L, PHYSICS_RATE);
13283                   if (lua_pcall(L, 1, 0, err_handler) != LUA_OK) {
13284                       snprintf(error_message, sizeof(error_message), "%s", lua_tostring(L, -1));
... [55 more lines]

Query and step patterns confirmed. Checking the registration table format, then I'll write the whole physics3 layer:

11593    // ============================================================================
11594   // LUA REGISTRATION
11595   // Binds all C functions to Lua global namespace
11596   // ============================================================================
11597   
11598   static void register_lua_bindings(lua_State* L) {
11599       // Create RNG metatable (for random_create instances)
11600       luaL_newmetatable(L, RNG_METATABLE);
11601       lua_pop(L, 1);
11602   
11603       // --- Layer & Texture ---
11604       lua_register(L, "layer_create", l_layer_create);
11605       lua_register(L, "layer_rectangle", l_layer_rectangle);
11606       lua_register(L, "layer_rectangle_line", l_layer_rectangle_line);
11607       lua_register(L, "layer_rectangle_gradient_h", l_layer_rectangle_gradient_h);
11608       lua_register(L, "layer_rectangle_gradient_v", l_layer_rectangle_gradient_v);
11609       lua_register(L, "layer_circle", l_layer_circle);
11610       lua_register(L, "layer_circle_line", l_layer_circle_line);
11611       lua_register(L, "layer_line", l_layer_line);
11612       lua_register(L, "layer_capsule", l_layer_capsule);
11613       lua_register(L, "layer_capsule_line", l_layer_capsule_line);
11614       lua_register(L, "layer_triangle", l_layer_triangle);
11615       lua_register(L, "layer_triangle_line", l_layer_triangle_line);
11616       lua_register(L, "layer_polygon", l_layer_polygon);
11617       lua_register(L, "layer_polygon_line", l_layer_polygon_line);
11618       lua_register(L, "layer_rounded_rectangle", l_layer_rounded_rectangle);
11619       lua_register(L, "layer_rounded_rectangle_line", l_layer_rounded_rectangle_line);
11620       lua_register(L, "layer_push", l_layer_push);
11621       lua_register(L, "layer_pop", l_layer_pop);
11622       lua_register(L, "layer_draw_texture", l_layer_draw_texture);
... [30 more lines]

11724:    lua_register(L, "physics_init", l_physics_init);
11725:    lua_register(L, "physics_set_gravity", l_physics_set_gravity);
11726:    lua_register(L, "physics_set_meter_scale", l_physics_set_meter_scale);
11727:    lua_register(L, "physics_set_enabled", l_physics_set_enabled);
11728:    lua_register(L, "physics_register_tag", l_physics_register_tag);
11729:    lua_register(L, "physics_enable_collision", l_physics_enable_collision);
11730:    lua_register(L, "physics_disable_collision", l_physics_disable_collision);
11731:    lua_register(L, "physics_enable_sensor", l_physics_enable_sensor);
11732:    lua_register(L, "physics_enable_hit", l_physics_enable_hit);
11733:    lua_register(L, "physics_tags_collide", l_physics_tags_collide);
11734:    lua_register(L, "physics_create_body", l_physics_create_body);
11735:    lua_register(L, "physics_destroy_body", l_physics_destroy_body);
11736:    lua_register(L, "physics_create_distance_joint", l_physics_create_distance_joint);
11737:    lua_register(L, "physics_destroy_joint", l_physics_destroy_joint);
11738:    lua_register(L, "physics_joint_is_valid", l_physics_joint_is_valid);

[Showing results with pagination = limit: 15]

99:#define B3_IS_NULL( id ) ( id.index1 == 0 )
102:#define B3_IS_NON_NULL( id ) ( id.index1 != 0 )
105:#define B3_ID_EQUALS( id1, id2 ) ( id1.index1 == id2.index1 && id1.world0 == id2.world0 && id1.generation == id2.generation )
===PROXYMAKE===
===HFDEF===
typedef struct b3HeightFieldDef
{
    /// Grid point heights
    /// count = countX * countZ
    float* heights;
    /// Grid cell material
    /// A value of 0xFF is reserved for holes
    /// count = (countX - 1) * (countZ - 1)
    uint8_t* materialIndices;
    /// The height field scale. All components must be positive values.
    b3Vec3 scale;
    /// The number of grid lines along the x-axis.
    int countX;
    /// The number of grid lines along the z-axis.
    int countZ;
    /// Global minimum and maximum heights used for quantization. This is important
    /// if you want height fields to be placed next to each other and line up exactly.
    /// In that case, both height fields should use the same minimum and maximum heights.
    /// All height values are clamped to this range.
    /// These values are in unscaled space.
    float globalMinimumHeight;
    /// The maximum.
    float globalMaximumHeight;
    /// Use clock-wise winding. This effectively inverts the height-field along the y-axis.
    bool clockwiseWinding;
... [30 more lines]

One final recon round — then I write the full physics3 layer in one pass:

8329 static int l_physics_set_user_data(lua_State* L) {
8330        b2BodyId* body_id = (b2BodyId*)lua_touserdata(L, 1);
8331        if (!body_id || !b2Body_IsValid(*body_id)) {
8332            return luaL_error(L, "Invalid body");
8333        }
8334        lua_Integer id = luaL_checkinteger(L, 2);
8335        b2Body_SetUserData(*body_id, (void*)(intptr_t)id);
8336        return 0;
8337    }
8338    
8339    static int l_physics_get_user_data(lua_State* L) {
8340        b2BodyId* body_id = (b2BodyId*)lua_touserdata(L, 1);
8341        if (!body_id || !b2Body_IsValid(*body_id)) {
8342            return luaL_error(L, "Invalid body");
8343        }
8344        void* data = b2Body_GetUserData(*body_id);
8345        lua_pushinteger(L, (lua_Integer)(intptr_t)data);
8346        return 1;
8347    }
8348    
8349    static int l_physics_shape_set_friction(lua_State* L) {

B3_API b3WorldTransform b3Body_GetTransform( b3BodyId bodyId );

--
B3_API void b3Body_SetTransform( b3BodyId bodyId, b3Pos position, b3Quat rotation );

--
B3_API b3Pos b3Body_GetWorldCenter( b3BodyId bodyId );

===MANIF===
2620:   int pointCount;
2723:   int pointCount;
===HULLDATA===
typedef struct b3HullData
    uint64_t version;
    int byteCount;
    uint32_t hash;
    b3AABB aabb;
    b3Vec3 center;
    b3Matrix3 centralInertia;
    int vertexCount;
    int vertexOffset;
    /// Offset of the point array in bytes from the struct address.
    int pointOffset;
    int edgeCount;
===GRIDMESH===
/// @param zCount the number of rows in the z direction
/// @param cellWidth the width of each cell
/// @param materialCount the number of materials to generate
/// @param identifyEdges compute adjacency information
B3_API b3MeshData* b3CreateGridMesh( int xCount, int zCount, float cellWidth, int materialCount, bool identifyEdges );
... [10 more lines]

All recon complete. Marking task 4 in progress and writing the physics3 layer — include, globals, event processing, then the bindings.

Updated task #4 status

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

Now the big bindings section. First, pin down the exact insertion anchor text:

9696-        lua_setfield(L, -2, "fraction");
9697-
9698-        lua_rawseti(L, -2, i + 1);
9699-    }
9700-    return 1;
9701-}
9702-
9703-// ============================================================================
9704:// LUA BINDINGS: RANDOM
9705-// PCG32 RNG, distributions, Perlin noise

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

Now wiring the step into all three loops and registering the bindings:

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

13583:    lua_register(L, "physics_raycast_all", l_physics_raycast_all);
13584-    // --- Random ---
13585-    lua_register(L, "random_create", l_random_create);

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

anchor.c

include/stb\stb_image_write.h(776): warning C4996: 'sprintf': This function or variable may be unsafe. Consider using sprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(313): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(1740): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(1860): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(4233): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(4227): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data

src/anchor.c(4633): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(4911): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(4917): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(5027): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(5036): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(5130): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(5132): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(6398): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and C++ conformant name: _strdup. See online help for details.

src/anchor.c(7722): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(8749): warning C4244: 'initializing': conversion from 'lua_Number' to 'float', possible loss of data

src/anchor.c(8750): warning C4244: 'initializing': conversion from 'lua_Number' to 'float', possible loss of data

src/anchor.c(9777): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(11181): warning C4113: 'float (__cdecl *)(b3ShapeId,b3Pos,b3Vec3,float,uint64_t,void *)' differs in parameter lists from 'b3CastResultFcn (__cdecl *)'

src/anchor.c(12051): warning C4244: '=': conversion from 'lua_Integer' to 'int', possible loss of data

src/anchor.c(12052): warning C4244: '=': conversion from 'lua_Integer' to 'int', possible loss of data

src/anchor.c(12058): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(12180): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(13028): warning C4996: '_snwprintf': This function or variable may be unsafe. Consider using _snwprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(13031): warning C4996: '_snwprintf': This function or variable may be unsafe. Consider using _snwprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(13106): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(13107): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(14252): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(14256): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

... [15 more lines]

/// @param childIndex the child shape index for compound shapes
/// @param context the user context
/// @return -1 to filter, 0 to terminate, fraction to clip the ray for closest hit, 1 to continue
/// @see b3World_CastRay
/// @ingroup world
typedef float b3CastResultFcn( b3ShapeId shapeId, b3Pos point, b3Vec3 normal, float fraction, uint64_t userMaterialId,
                               int triangleIndex, int childIndex, void* context );

/// Optional world capacities that can be use to avoid run-time allocations
/// @ingroup world
typedef struct b3Capacity

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

Fixed. Rebuilding, and checking how a game quits from Lua (needed for a multi-frame headless test):

Command running in background with ID: b4b8mn2uw. Output is being written to: C:\Users\adn\AppData\Local\Temp\claude\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803\tasks\b4b8mn2uw.output. You will be notified when it completes. To check interim output, use Read on that file path.

13755:    lua_register(L, "engine_quit", l_engine_quit);

Writing the headless physics3 test while the engine rebuilds — raw C bindings only (no framework), so it isolates the binding layer:

File created successfully at: E:\a327ex\Anchor3\test-physics3\main.lua (file state is current in your context — no need to Read it back)

Rebuild clean. Running the headless physics3 test:

Physics3 initialized (Box3D)
ERROR: engine_init() was not called. Did you forget to require 'anchor'?

The engine needs the Lua-side engine_init() bootstrap (normally done by require('anchor')). Checking the minimal call:

129:  -- Apply engine configuration before engine_init
144:  engine_init()
12490:static int l_engine_init(lua_State* L) {

110    fps = engine_get_fps()
111   draw_calls = engine_get_draw_calls()
112 end
113 
114 --[[
115   set_time_scale(scale)
116   Sets the engine-level time scale. Affects dt but not unscaled_dt.
117   Use unscaled_dt for things that should ignore slow-mo (UI, etc.).
118 ]]
119 function set_time_scale(s)
120   time_scale = s
121   engine_set_time_scale(s)
122 end
123 
124 -- The framework initialization function returned by require('anchor').
125 -- Called with a config table by the game's main.lua.
126 return function(config)
127   config = config or {}
128 
129   -- Apply engine configuration before engine_init
130   if config.width and config.height then
131     engine_set_game_size(config.width, config.height)
132   end
133   if config.title then engine_set_title(config.title) end
134   if config.scale then engine_set_scale(config.scale) end
135   if config.vsync ~= nil then engine_set_vsync(config.vsync) end
136   if config.fullscreen ~= nil then engine_set_fullscreen(config.fullscreen) end
137   if config.resizable ~= nil then engine_set_resizable(config.resizable) end
138   if config.web_native_resolution ~= nil and engine_set_web_native_resolution then engine_set_web_native_resolution(config.web_native_resolution) end
139   if config.render_uncapped ~= nil then engine_set_render_uncapped(config.render_uncapped) end
... [14 more lines]

The file E:\a327ex\Anchor3\test-physics3\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

TEST collision_begin fires        PASS  frame=108 point=(0.00, 0.51, 0.00) normal=(0.00, 1.00, 0.00)
TEST begin tags correct           PASS  tag_a=ground tag_b=ball
TEST hit event fires              PASS  frame=108 speed=8.92 m/s
TEST ball rested on ground        PASS  pos=(0.000, 1.000, 0.000), expected y≈1.0
TEST contact happened             PASS  
TEST hit happened                 PASS  
TEST ball velocity ~0 at rest     PASS  vel=(0.000, 0.000, 0.000)
TEST rotation is unit quat        PASS  q=(0.000, 0.000, 0.000, 1.000) len=1.0000
TEST raycast hits                 PASS  tag=ball point_y=1.500
TEST raycast hits ball first      PASS  tag=ball
TEST raycast point on top of ball PASS  point_y=1.500 expected≈1.5
TEST raycast tag filter           PASS  tag=ground
TEST raycast_all finds 2+         PASS  #hits=2
TEST query_sphere finds ball      PASS  #bodies=1
TEST query_aabb finds both        PASS  #bodies=2
TEST query miss is empty          PASS  #bodies=0
TEST user_data roundtrip          PASS  got=42
TEST body type                    PASS  dynamic/static
TEST sphere mass sane             FAIL  mass=523.599
TEST body count                   PASS  count=2
TEST bodies valid                 PASS  
TEST impulse takes effect         FAIL  vy=0.000 (expected > 1, impulse 5 on ~0.52kg... clamped?)
TEST destroy invalidates          PASS  
TEST body count after destroy     PASS  count=1
SUMMARY: 22 passed, 2 failed, 24 total

The file E:\a327ex\Anchor3\test-physics3\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\test-physics3\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

SUMMARY: 24 passed, 0 failed, 24 total
ALL TESTS PASSED

The file E:\a327ex\Anchor3\test-physics3\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\test-physics3\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

TEST body count after destroy     FAIL  count=5
SUMMARY: 27 passed, 1 failed, 28 total

The file E:\a327ex\Anchor3\test-physics3\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

SUMMARY: 28 passed, 0 failed, 28 total
ALL TESTS PASSED
warning: in the working copy of 'test-physics3/main.lua', LF will be replaced by CRLF the next time Git touches it
7945d43 physics3: full Box3D binding layer, 28/28 headless tests green
d5c51c5 Anchor 3 scaffold: Anchor2 engine+framework copy, Box3D vendored at 52f1a25, build green

Updated task #4 status

Updated task #3 status

3223:// LAYER SYSTEM
3784:// BATCH RENDERING
5338:// RENDERING PIPELINE

3223 // LAYER SYSTEM
3224    // FBO management, transform stack, command queue, drawing primitives
3225    // ============================================================================
3226    
3227    // Create a layer with FBO at specified resolution
3228    static Layer* layer_create(int width, int height, int layer_filter) {
3229        Layer* layer = (Layer*)calloc(1, sizeof(Layer));
3230        if (!layer) return NULL;
3231    
3232        layer->width = width;
3233        layer->height = height;
3234        layer->filter_mode = layer_filter;
3235    
3236        // Initialize transform stack with identity matrix at depth 0
3237        layer->transform_depth = 0;
3238        float* m = layer->transform_stack;
3239        m[0] = 1.0f; m[1] = 0.0f; m[2] = 0.0f;  // row 0
3240        m[3] = 0.0f; m[4] = 1.0f; m[5] = 0.0f;  // row 1
3241        m[6] = 0.0f; m[7] = 0.0f; m[8] = 1.0f;  // row 2
3242    
3243        if (headless_mode) {
3244            // Headless: no command buffer, no FBO — all draw calls become no-ops
3245            layer->commands = NULL;
3246            layer->command_count = 0;
3247            layer->command_capacity = 0;
3248            layer->current_blend = BLEND_ALPHA;
3249            return layer;
3250        }
3251    
3252        // Initialize command queue (fixed size, never grows)
... [150 more lines]

467:} DrawCommand;
508:} Layer;
4105:typedef enum { DROP_KIND_FILE = 0, DROP_KIND_TEXT = 1 } DropKind;
4164:typedef enum {
4545:typedef enum {

380          return NULL;
381     }
382 
383     fclose(f);
384     *out_size = size;
385     return data;
386 }
387 static void zip_shutdown(void) {}
388 #endif
389 
390 // Transform stack depth
391 #define MAX_TRANSFORM_DEPTH 32
392 
393 // Command queue capacity (fixed size, allocated once)
394 // 16384 commands × ~64 bytes = ~1MB per layer
395 #define MAX_COMMAND_CAPACITY 65536
396 
397 // Command types
398 enum {
399     COMMAND_RECTANGLE = 0,
400     COMMAND_CIRCLE,
401     COMMAND_SPRITE,
402     COMMAND_GLYPH,              // Font glyph with custom UVs (uses flash_color for packed UVs)
403     COMMAND_SPRITESHEET_FRAME,  // Spritesheet frame with custom UVs and flash support
404     COMMAND_LINE,               // Line segment / capsule
405     COMMAND_TRIANGLE,           // Triangle (3 vertices)
406     COMMAND_POLYGON,            // Polygon (up to 8 vertices)
407     COMMAND_ROUNDED_RECTANGLE,  // Rounded rectangle
408     COMMAND_RECTANGLE_GRADIENT_H, // Horizontal gradient rectangle (left to right)
409     COMMAND_RECTANGLE_GRADIENT_V, // Vertical gradient rectangle (top to bottom)
... [105 more lines]

6138:static void layer_render(Layer* layer) {
7540:static int l_layer_draw(lua_State* L) {
7580:static int l_layer_render(lua_State* L) {

6138 static void layer_render(Layer* layer) {
6139        batch_vertex_count = 0;
6140        current_batch_texture = 0;
6141        uint8_t current_blend = BLEND_ALPHA;  // Start with default
6142        apply_blend_mode(current_blend);
6143    
6144        // Set u_aa_width for this layer's filter mode. The default draw shader is
6145        // shared across all layers, so we rebind the uniform each time a layer is
6146        // rendered so smooth and rough layers can coexist in the same frame.
6147        // Shape and sprite/glyph branches both branch on u_aa_width.
6148        glUseProgram(shader_program);
6149        GLint aa_loc = glGetUniformLocation(shader_program, "u_aa_width");
6150        float aa_width = (layer->filter_mode == FILTER_SMOOTH) ? 1.0f : 0.0f;
6151        glUniform1f(aa_loc, aa_width);
6152        // (Text coverage gamma is baked into the atlas in font_blit_to_buffer, not applied
6153        // via a per-draw uniform — see the note there: such a uniform gets stripped by some
6154        // GLSL linkers and blanks all AA text.)
6155    
6156        for (int i = 0; i < layer->command_count; i++) {
6157            const DrawCommand* cmd = &layer->commands[i];
6158    
6159            // Handle uniform setting commands
6160            // These need to temporarily switch programs, so flush batch first and restore after
6161            if (cmd->type == COMMAND_SET_UNIFORM_FLOAT ||
6162                cmd->type == COMMAND_SET_UNIFORM_VEC2 ||
6163                cmd->type == COMMAND_SET_UNIFORM_VEC4 ||
6164                cmd->type == COMMAND_SET_UNIFORM_INT ||
6165                cmd->type == COMMAND_SET_UNIFORM_TEXTURE) {
6166                // Flush any pending draws before switching programs
6167                batch_flush();
... [90 more lines]

7540 static int l_layer_draw(lua_State* L) {
7541        if (headless_mode) return 0;
7542        Layer* layer = (Layer*)lua_touserdata(L, 1);
7543        float x = (lua_gettop(L) >= 2) ? (float)luaL_checknumber(L, 2) : 0.0f;
7544        float y = (lua_gettop(L) >= 3) ? (float)luaL_checknumber(L, 3) : 0.0f;
7545        layer_queue_draw(layer, x, y);
7546        return 0;
7547    }
7548    
7549    static int l_layer_get_texture(lua_State* L) {
7550        Layer* layer = (Layer*)lua_touserdata(L, 1);
7551        GLuint tex = layer_get_texture(layer);
7552        lua_pushinteger(L, (lua_Integer)tex);
7553        return 1;
7554    }
7555    
7556    static int l_layer_reset_effects(lua_State* L) {
7557        Layer* layer = (Layer*)lua_touserdata(L, 1);
7558        layer_reset_effects(layer);
7559        return 0;
7560    }
7561    
7562    // Clear a layer's FBO contents (transparent black)
7563    static int l_layer_clear(lua_State* L) {
7564        if (headless_mode) return 0;
7565        Layer* layer = (Layer*)lua_touserdata(L, 1);
7566    
7567        // Bind the layer's current target FBO
7568        GLuint target_fbo = layer->textures_swapped ? layer->effect_fbo : layer->fbo;
7569        glBindFramebuffer(GL_FRAMEBUFFER, target_fbo);
... [90 more lines]

typedef struct b3DebugDraw
    bool ( *DrawShapeFcn )( void* userShape, b3WorldTransform transform, b3HexColor color, void* context );
    void ( *DrawSegmentFcn )( b3Pos p1, b3Pos p2, b3HexColor color, void* context );
    void ( *DrawTransformFcn )( b3WorldTransform transform, void* context );
    /// Draw a point.
    void ( *DrawPointFcn )( b3Pos p, float size, b3HexColor color, void* context );
    void ( *DrawSphereFcn )( b3Pos p, float radius, b3HexColor color, float alpha, void* context );
    void ( *DrawCapsuleFcn )( b3Pos p1, b3Pos p2, float radius, b3HexColor color, float alpha, void* context );
    void ( *DrawBoundsFcn )( b3AABB aabb, b3HexColor color, void* context );
    void ( *DrawBoxFcn )( b3Vec3 extents, b3WorldTransform transform, b3HexColor color, void* context );
    void ( *DrawStringFcn )( b3Pos p, const char* s, b3HexColor color, void* context );
    b3AABB drawingBounds;
    float forceScale;
    /// Global scaling for joint drawing
    float jointScale;
    bool drawShapes;
    /// Option to draw joints
    bool drawJoints;
    /// Option to draw additional information for joints
    bool drawJointExtras;
    bool drawBounds;
    bool drawMass;
    bool drawSleep;
    bool drawBodyNames;
    /// Option to draw contact points
    bool drawContacts;
    int drawAnchorA;
    /// Option to visualize the graph coloring used for contacts and joints
    bool drawGraphColors;
    bool drawContactFeatures;
... [6 more lines]

6421:static int l_layer_create(lua_State* L) {
6422-    const char* name = luaL_checkstring(L, 1);
6423-
6424-    int layer_filter = filter_mode;  // default: global
6425-    if (lua_gettop(L) >= 2 && !lua_isnil(L, 2)) {
6426-        const char* mode = luaL_checkstring(L, 2);
6427-        if (strcmp(mode, "smooth") == 0) {
6428-            layer_filter = FILTER_SMOOTH;
6429-        } else if (strcmp(mode, "rough") == 0) {
6430-            layer_filter = FILTER_ROUGH;
6431-        } else {
6432-            return luaL_error(L, "Invalid layer filter: %s (use 'smooth' or 'rough')", mode);
6433-        }
6434-    }
6435-

182:static GLuint create_shader_program(const char* vert_src, const char* frag_src);
4010:static GLuint shader_program = 0;
12586:    shader_program = create_shader_program(vertex_shader_source, fragment_shader_source);
14118:static GLuint create_shader_program(const char* vert_src, const char* frag_src) {
14192:    shader_program = shader;
14336:    if (shader_program) { glDeleteProgram(shader_program); shader_program = 0; mem_gl_program_count--; }

6435 
6436        Layer* layer = layer_get_or_create(name, layer_filter);
6437        if (!layer) {
6438            return luaL_error(L, "Failed to create layer: %s", name);
6439        }
6440        lua_pushlightuserdata(L, layer);
6441        return 1;
6442    }
6443    
6444    // layer_rectangle(layer, x, y, w, h, color) -- filled rectangle
6445    static int l_layer_rectangle(lua_State* L) {
6446        Layer* layer = (Layer*)lua_touserdata(L, 1);
6447        float x = (float)luaL_checknumber(L, 2);
6448        float y = (float)luaL_checknumber(L, 3);
6449        float w = (float)luaL_checknumber(L, 4);
6450        float h = (float)luaL_checknumber(L, 5);
6451        uint32_t color = (uint32_t)luaL_checkinteger(L, 6);
6452        layer_add_rectangle(layer, x, y, w, h, 0.0f, color); // stroke=0 for filled
6453        return 0;
6454    }
6455    
6456    // layer_rectangle_line(layer, x, y, w, h, color, line_width?) -- rectangle outline
6457    static int l_layer_rectangle_line(lua_State* L) {
6458        Layer* layer = (Layer*)lua_touserdata(L, 1);
6459        float x = (float)luaL_checknumber(L, 2);
6460        float y = (float)luaL_checknumber(L, 3);
6461        float w = (float)luaL_checknumber(L, 4);
6462        float h = (float)luaL_checknumber(L, 5);
6463        uint32_t color = (uint32_t)luaL_checkinteger(L, 6);
6464        float line_width = (float)luaL_optnumber(L, 7, 1.0);
... [10 more lines]

One detail I must match exactly — the packed color format the 2D path uses:

3877:    *r = ((color >> 24) & 0xFF) / 255.0f;
3878:    *g = ((color >> 16) & 0xFF) / 255.0f;
3879:    *b = ((color >> 8) & 0xFF) / 255.0f;
3880:    *a = (color & 0xFF) / 255.0f;

3872     }
3873    }
3874    
3875    // Unpack uint32 color to RGBA floats (0-1)
3876    static void unpack_color(uint32_t color, float* r, float* g, float* b, float* a) {
3877        *r = ((color >> 24) & 0xFF) / 255.0f;
3878        *g = ((color >> 16) & 0xFF) / 255.0f;
3879        *b = ((color >> 8) & 0xFF) / 255.0f;
3880        *a = (color & 0xFF) / 255.0f;
3881    }

types.h:2753:typedef enum b3HexColor
types.h:2901:} b3HexColor;
types.h:3041:B3_API b3DebugDraw b3DefaultDebugDraw( void );
56:B3_API void b3World_Draw( b3WorldId worldId, b3DebugDraw* draw, uint64_t maskBits );

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

Cleaning up a leftover dead computation in the capsule helper, then wiring registration and queue-clearing:

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

Exit code 255
include/stb\stb_image_write.h(776): warning C4996: 'sprintf': This function or variable may be unsafe. Consider using 

sprintf_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(313): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. 

To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(1740): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(1860): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(4233): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(4227): warning C4267: 'initializing': conversion from 'size_t' to 'int', possible loss of data

src/anchor.c(4633): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(4911): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(4917): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(5027): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(5036): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(5130): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(5132): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(6398): warning C4996: 'strdup': The POSIX name for this item is deprecated. Instead, use the ISO C and 

C++ conformant name: _strdup. See online help for details.

src/anchor.c(8119): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s 

instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

... [16 more lines]

Build failed — let me see the actual errors:

(PowerShell completed with no output)

-rwxr-xr-x 1 adn 197121 5006848 Jul  7 14:36 E:/a327ex/Anchor3/engine/build/anchor.exe
SUMMARY: 28 passed, 0 failed, 28 total
ALL TESTS PASSED

The file E:\a327ex\Anchor3\test-physics3\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

TEST unproject center ray         PASS  dir=(-0.647, -0.404, -0.647) expected=(-0.647, -0.404, -0.647) dot=1.00000
TEST unproject origin near eye    PASS  origin=(7.935, 5.960, 7.935)
TEST screen-center pick hits ball PASS  tag=ball point=(0.32, 1.20, 0.32)
SUMMARY: 31 passed, 0 failed, 31 total
ALL TESTS PASSED

warning: in the working copy of 'test-physics3/main.lua', LF will be replaced by CRLF the next time Git touches it
fa2546f layer3: 3D scene rendering — instanced flat-shaded primitives, camera, debug draw
7945d43 physics3: full Box3D binding layer, 28/28 headless tests green
d5c51c5 Anchor 3 scaffold: Anchor2 engine+framework copy, Box3D vendored at 52f1a25, build green

Updated task #3 status

Updated task #5 status

Updated task #6 status

Updated task #7 status

Now the framework Lua layer. Reading the existing modules to mirror their conventions exactly:

1    --[[
2     physics — entity-resolving wrappers for physics queries.
3   
4     The C engine's physics_query_* and physics_get_*_begin/end functions return
5     raw body handles with tag names. These framework helpers:
6       1. Resolve bodies to their owning entities via physics_get_user_data + entities
7       2. Normalize event ordering so `a` always corresponds to the first tag
8          argument in the query and `b` to the second
9   
10    The normalization matters because the engine's `tags_match` is order-
11    insensitive, so a query like `collision_entities_begin('player', 'enemy')`
12    could receive events where the collision was recorded as
13    `tag_a='enemy', tag_b='player'`. Without normalization, you'd get `ev.a`
14    being the enemy when you expected the player. These helpers check the
15    tag names and swap if needed so `ev.a` is always the first-tag entity.
16  
17    Usage:
18      for _, ev in ipairs(collision_entities_begin('player', 'enemy')) do
19        ev.a:hit(1)   -- always the player (first query tag)
20        -- ev.b        -- always the enemy (second query tag)
21      end
22  
23      for _, ev in ipairs(sensor_entities_begin('bullet', 'enemy')) do
24        ev.a:kill()   -- the bullet
25        ev.b:hit(1)   -- the enemy
26      end
27  ]]
28  
29  -- Internal: resolve a body handle to its owning entity via user_data.
30  local function body_to_entity(body)
... [225 more lines]

1    --[[
2     collider — thin wrapper around a Box2D physics body + shape.
3   
4     Stays as a class (with :method syntax) because:
5       1. It bundles body + shape + tag into one object
6       2. Steering behaviors logically operate on the collider, not a bare body
7       3. Multiple method calls per entity per frame — call site ergonomics matter
8   
9     Usage:
10      function seeker:new(x, y, args)
11        self.x = x
12        self.y = y
13        make_entity(self)                                        -- must be before collider
14        self.collider = collider(self, 'enemy', 'dynamic', 'box', 14, 6)
15        self.collider:set_position(x, y)
16      end
17  
18      function seeker:update(dt)
19        -- sync position from physics body to self.x/self.y
20        self.x, self.y = self.collider:get_position()
21        -- or call self.collider:sync() which does it for you
22      end
23  
24      function seeker:destroy()
25        self.collider:destroy()
26      end
27  
28    The collider stores a back-reference to its owner (`self.owner`) set at
29    creation. The physics body's user_data is set to owner.id, so physics
30    queries can resolve bodies back to entities via entities[user_data].
... [90 more lines]

Framework style is clear. Checking the input API surface for the playground's camera controls:

key_is_down
key_is_pressed
key_is_released
mouse_position
mouse_delta
mouse_set_visible
mouse_set_grabbed
mouse_set_window_grab
mouse_is_down
mouse_is_pressed
mouse_is_released
mouse_wheel
input_bind
input_bind_chord
input_bind_sequence
input_bind_hold
input_get_hold_duration
input_get_last_type
input_start_capture
input_get_captured
===
--[[
  input — thin wrapper layer over the engine's built-in action binding system.

  The C engine provides input_bind/is_down/is_pressed/is_released/etc.
  This module provides function wrappers that forward to those. Function
  wrappers (instead of direct aliases) are used so that the engine C
  functions are resolved at *call* time, not at module *load* time.
  (The engine registers its functions during engine_init(), which runs
  AFTER this module is loaded.)
... [41 more lines]

1:--[[
10:    require('anchor')({
56:-- Load framework modules (order matters for module dependencies)
57:require('anchor.class')
58:require('anchor.math')
59:require('anchor.array')
60:require('anchor.color')
61:require('anchor.object')
62:require('anchor.helpers')
63:require('anchor.input')
64:require('anchor.timer')
65:require('anchor.spring')
66:require('anchor.animation')
67:require('anchor.font')
68:require('anchor.image')
69:require('anchor.spritesheet')
70:require('anchor.layer')
71:require('anchor.shake')
72:require('anchor.camera')
73:require('anchor.collider')
74:require('anchor.joint')
75:require('anchor.physics')
76:require('anchor.memory')
78:-- Global resource tables. Game code populates these via the resource loaders.
88:--[[

Writing the four 3D framework modules:

File created successfully at: E:\a327ex\Anchor3\framework\anchor\math3.lua (file state is current in your context — no need to Read it back)

File created successfully at: E:\a327ex\Anchor3\framework\anchor\collider3.lua (file state is current in your context — no need to Read it back)

File created successfully at: E:\a327ex\Anchor3\framework\anchor\camera3.lua (file state is current in your context — no need to Read it back)

File created successfully at: E:\a327ex\Anchor3\framework\anchor\physics3.lua (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\framework\anchor\init.lua has been updated successfully. (file state is current in your context — no need to Read it back)

Framework modules in. Now the playground — checking color/font APIs and the arena bootstrap idiom first:

--[[
  color — mutable RGBA color with HSL conversion helpers.

  Simpler than v1's color class. A color is a plain table {r, g, b, a} with
  a __call metamethod that returns the packed rgba integer used by drawing
  functions. No auto-sync between RGB and HSL — HSL is a *conversion*, not a
  storage format. If you want to modify hue, convert to HSL, modify, convert
  back.

  Usage:
    red = color_new(255, 0, 0)
    red.a = 128              -- set alpha
    layer_circle(game_layer, x, y, r, red())  -- __call returns packed rgba integer

    -- HSL manipulation:
    h, s, l = color_to_hsl(red)
    h = (h + 120) % 360      -- shift hue
    shifted = color_from_hsl(h, s, l, red.a)

    -- Common operations:
    copy = color_clone(red)
    mixed = color_mix(red, blue, 0.5)
    dark = color_darken(red, 0.5)      -- multiply RGB by 0.5
    light = color_lighten(red, 1.5)    -- multiply RGB by 1.5 (clamped)
    inverted = color_invert(red)

  Design notes:
    - Colors are plain tables. Modify fields directly: c.r = 100.
    - Procedural functions (color_mix, color_clone, etc.) return NEW colors,
      not mutating the input. If you want to mutate, do `c.r = ...` directly.
... [146 more lines]

1    --[[
2     Layer module — procedural API over the engine layer handle.
3   
4     Layers are FBOs that accumulate draw commands during the frame. Commands are
5     deferred and processed via layer_render() with GL batching. Composite to the
6     screen with layer_draw().
7   
8     Usage:
9       game_layer = layer_new('game')
10      layer_rectangle(game_layer, 100, 100, 50, 30, color)
11      layer_render(game_layer)
12      layer_draw(game_layer)
13  
14    State table shape (from layer_new): { name, handle, parallax_x, parallax_y }
15    All layer_* functions below take that table as the first argument `lyr`.
16  
17    ---------------------------------------------------------------------------
18    ENGINE NAME CONFLICTS (Lua globals registered by anchor.c)
19  
20    The C engine binds the same symbol names to raw engine implementations whose
21    first argument is a C layer pointer (lightuserdata), e.g. layer_rectangle(ptr, ...).
22  
23    This file captures those implementations in `eng` at load time, then REPLACES
24    the globals with wrappers whose first argument is a layer state table from
25    layer_new() (field .handle holds the pointer). Wrappers also accept a raw
26    handle for occasional interop.
27  
28    After require('anchor.layer'), direct engine-style calls like
29    layer_rectangle(userdata_ptr, x, y, w, h, c) no longer use the C binding
30    unless you passed a lightuserdata: the wrapper treats a non-table first arg
... [245 more lines]

File created successfully at: E:\a327ex\Anchor3\framework\anchor\layer3.lua (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\framework\anchor\init.lua has been updated successfully. (file state is current in your context — no need to Read it back)

Checking object.lua (entity lifecycle) and the random helpers before writing the playground:

1    --[[
2     object — entity registry, kill queue, deferred destruction.
3   
4     This is the foundation of Anchor 2's reference discipline. Entities are
5     plain tables with a numeric id; the global `entities` table maps id to
6     entity. Cross-entity references are stored as IDs and resolved via
7     lookup, so stale references are impossible (they just return nil).
8   
9     Usage:
10      seeker = class()
11      function seeker:new(x, y)
12        self.x = x
13        self.y = y
14        make_entity(self)           -- assigns self.id and registers
15      end
16  
17      function seeker:destroy()     -- called at end of frame after kill()
18        -- clean up sub-objects here
19      end
20  
21      -- Cross-entity reference (ID, not pointer):
22      self.target_id = other_entity.id
23  
24      -- Resolve at use time:
25      local t = entities[self.target_id]
26      if t then t:hit(5) end
27  
28      -- Kill an entity (queues for end-of-frame destruction):
29      entity:kill()
30  
... [79 more lines]

File created successfully at: E:\a327ex\Anchor3\playground\main.lua (file state is current in your context — no need to Read it back)

File created successfully at: E:\a327ex\Anchor3\playground\run.bat (file state is current in your context — no need to Read it back)

OK framework/anchor/math3.lua
OK framework/anchor/layer3.lua
OK framework/anchor/collider3.lua
OK framework/anchor/camera3.lua
OK framework/anchor/physics3.lua
OK framework/anchor/init.lua
OK playground/main.lua
OK test-physics3/main.lua

Command running in background with ID: bxgg73681. Output is being written to: C:\Users\adn\AppData\Local\Temp\claude\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803\tasks\bxgg73681.output. You will be notified when it completes. To check interim output, use Read on that file path.

Read (C:\Users\adn\AppData\Local\Temp\claude\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803\tasks\bxgg73681.output)

(Bash completed with no output)

---exit marker---
========================= ======== ================ =========== ============

anchor.exe                   10432 Console                    1     35.908 K

anchor.exe                   25124 Console                    1     16.968 K

SUCCESS: The process "anchor.exe" with PID 10432 has been terminated.

SUCCESS: The process "anchor.exe" with PID 25124 has been terminated.

648:local verify_mode = engine_get_args().verify ~= nil
695:    if verify_mode then engine_quit() end

644  end)
645 
646 p1 = player(width / 2, height / 2)
647 
648 local verify_mode = engine_get_args().verify ~= nil
649 
650 function update(dt)
651     sync_engine_globals()
652 
653     -- Reset at any time. Early-return so we don't process a mid-reset frame.
654     if input_pressed('reset') then
655         reset_game()
656         return
657     end
658 
659     -- Freeze spawning on game over so enemies don't pile up on the GAME OVER screen.
660     -- Everything else (existing enemies, projectiles, effects) keeps running.
661     if not game_over then timer_update(spawn_timer, dt) end
662 
663     if p1 and not p1._dead then p1:update(dt) end
664     collection_update(enemies, dt)
665     collection_update(projectiles, dt)
666     collection_update(effects, dt)
667 
668     for _, ev in ipairs(sensor_entities_begin('projectile', 'enemy')) do
669         local proj, e = ev.a, ev.b
670         if proj and not proj._dead and e and not e._dead then
671             fx_projectile_hit_enemy(proj, e)
672             e:hit(1)
673             proj:kill()
... [25 more lines]

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

Created layer: ui (smooth)

Loaded font: main (32.0px, smooth) page=1024x1024

Initialization complete. Press ESC to exit, F11 for fullscreen.

Headless loop starting...

VERIFY OK: 56 bodies, 55 crates, top crate y=4.50

Shutting down...

static int l_mouse_delta(lua_State* L) {
static int l_mouse_wheel(lua_State* L) {
    return 2;
static int l_input_bind(lua_State* L) {

}

static int l_mouse_wheel(lua_State* L) {
    lua_pushinteger(L, mouse_wheel_x);
    lua_pushinteger(L, mouse_wheel_y);
    return 2;
}

// Action binding Lua bindings
static int l_input_bind(lua_State* L) {
    const char* action = luaL_checkstring(L, 1);
    const char* control = luaL_checkstring(L, 2);
    lua_pushboolean(L, input_bind_control(action, control));
    return 1;
}
static int l_mouse_delta(lua_State* L) {
    // Delta is in window pixels, scale to game pixels
    int window_w, window_h;
    SDL_GetWindowSize(window, &window_w, &window_h);
    float scale_x = (float)window_w / game_width;
    float scale_y = (float)window_h / game_height;
    float scale = (scale_x < scale_y) ? scale_x : scale_y;
    if (scale < 1.0f) scale = 1.0f;

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

Now the 3D API doc and the plan update, then final commit:

File created successfully at: E:\a327ex\Anchor3\docs\3D_API.md (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\reference\plan.md has been updated successfully. (file state is current in your context — no need to Read it back)

VERIFY OK: 56 bodies, 55 crates, top crate y=4.50

Shutting down...

SUMMARY: 31 passed, 0 failed, 31 total
ALL TESTS PASSED

warning: in the working copy of 'framework/anchor/init.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'reference/plan.md', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'docs/3D_API.md', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'framework/anchor/camera3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'framework/anchor/collider3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'framework/anchor/layer3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'framework/anchor/math3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'framework/anchor/physics3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/animation.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/camera.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/camera3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/class.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/collider.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/collider3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/color.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/font.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/image.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/init.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/input.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/joint.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/layer3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/math3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/memory.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/object.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/physics.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/physics3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/shake.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/spring.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/spritesheet.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/timer.lua', LF will be replaced by CRLF the next time Git touches it
... [6 more lines]

Updated task #7 status

Updated task #8 status

All phases complete. Saving the project memory, then the summary:

[sealed content withheld: memory]

[sealed content withheld: memory]

[sealed content withheld: memory]

Read (C:\Users\adn\.claude\projects\E--a327ex\memory\MEMORY.md)

[sealed content withheld: memory]

Anchor 3 exists and the whole tier-(b) stack is built, committed, and green on every test I can run without opening a window. The playground is ready for your first run — that run is the remaining verification step.

What got built (4 commits in E:/a327ex/Anchor3/, own local git, fully siloed)

Scaffold + vendoring. Full copy of Anchor 2's engine and framework (Anchor2 untouched — the only stripped thing is the emoji-ball-battles deploy step in the copied build.bat). Box3D vendored flat into engine/include/box3d/ exactly like box2d, pinned at commit 52f1a25 (July 6, one day before I cloned it), building as box3d.lib. It compiled and linked under MSVC on the first try.

Physics. 72 physics3_* bindings mirroring the 2D surface: separate Box3D world stepped beside the 2D world at the same 120Hz fixed step, its own tag/collision-matrix namespace, bodies, shapes (sphere, box, capsule, cylinder, hull, wave heightfield, grid mesh), quaternion transforms, forces/impulses, motion locks (the 3D generalization of fixed_rotation), contact/hit/sensor events, overlap queries, raycasts. A headless test suite (test-physics3) covers it with 31 passing tests — a ball drops, bounces, rests at exactly y=1.000, events fire with correct points and normals, filtered raycasts and queries behave, all five shape types come to rest properly. Your instinct was right: with the 2D bindings as a template, Box3D's API mapped almost mechanically.

Rendering. The layer seam worked even better than the assessment predicted — 2D layers already carry a depth-stencil attachment, so a layer3 renders its 3D pass straight into a standard Layer's FBO and composites through the existing chain. Post-process shaders on 3D scenes work for free. The look is the deliberate one: unit primitive meshes with per-face normals (faceted low-poly), instanced per frame, one Lambert+ambient shader, plus a 3D line batch. Box3D's debug draw is wired so colliders render as solid instanced shapes, not wireframes. Perspective look-at camera with unproject; the headless suite verifies the full camera math chain by unprojecting a screen-center ray and confirming the physics raycast along it hits the ball.

Framework + playground. Five new modules in the v2 style (math3, layer3, collider3, camera3, physics3 — all registered in init.lua, with the same wrapper/shadowing and entity-resolution patterns as their 2D siblings), and the playground: a 55-crate pyramid and droppable balls on a 40×40m ground, orbit camera, mouse-ray punching, a query-driven shockwave, debug-draw toggle, and a 2D HUD composited on top. Headless, the pyramid settles and stays standing after 300 steps.

How to test

cd E:/a327ex/Anchor3/playground && ./run.bat

RMB drag orbits, wheel zooms, LMB punches whatever you click, B drops a ball, space fires a shockwave, F1 toggles physics debug draw, R resets.

Things I could not verify headless, in likely-wrong order (all listed in docs/3D_API.md): lighting direction/intensity feel, debug-draw box size (if F1 shows crates at double size, the 2*extents in debug3_draw_box needs dropping), orbit/zoom sensitivity, and whether the scene composites upright. Physics behavior itself is solid — that part is tested.

Two decisions I made that you may want to revisit: I kept Box3D's default restitution threshold instead of zeroing it like the 2D world (resting 3D contacts jitter otherwise; there's a setter if you want bouncier), and Box3D's default density is 1000 kg/m³ — real-world heavy — so all playground impulses are mass-scaled. Deferred for later: joints, character mover (Box3D's own weak spot for now), custom heightfields, web build, transparency.

<task-notification> <task-id>bbbwwgbsx</task-id> <tool-use-id>toolu_01FeAwfXPWNAdKqWYjdzUWmQ</tool-use-id> <output-file>C:\Users\adn\AppData\Local\Temp\claude\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803\tasks\bbbwwgbsx.output</output-file> completed

Background command "Open assessment doc in NeoVim with MarkdownPreview" completed (exit code 0)

</task-notification>

That was just the NeoVim window from the original assessment doc closing — no action needed. Everything stands from the summary above: the playground is ready for its first windowed run (cd E:/a327ex/Anchor3/playground && ./run.bat) whenever you want to try it.

Lua draw() error: main.lua:270: bad argument #3 to 'format' (number has no integer representation)

250    for i = #crates, 1, -1 do
251     if crates[i]._dead then table.remove(crates, i)
252     else crates[i]:update(dt) end
253   end
254 
255   process_destroy_queue()
256 end
257 
258 function draw()
259   if debug_draw_enabled then
260     layer3_debug_draw(scene)
261   else
262     the_ground:draw()
263     for _, c in ipairs(crates) do c:draw() end
264     for _, b in ipairs(balls) do b:draw() end
265   end
266 
267   -- HUD (2D layer composited over the 3D scene)
268   layer_text(ui_layer, 'RMB orbit   wheel zoom   LMB punch   B ball   space shockwave   F1 debug   R reset',
269              fonts.main, 12, 8, fg_color())
270   layer_text(ui_layer, string.format('bodies %d   fps %d', physics3_get_body_count(), fps or 0),
271              fonts.main, 12, height - 40, fg_color())
272 
273   layer3_render(scene)
274   layer_draw(scene.layer)
275   layer_render(ui_layer)
276   layer_draw(ui_layer)
277 end
278 

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

Anchor3\playground\main.lua:187:      print(string.format('VERIFY OK: %d bodies, %d crates, top crate y=%.2f',
Anchor3\playground\main.lua:270:  layer_text(ui_layer, string.format('bodies %d   fps %d', physics3_get_body_count(), math.floor(fps or 0)),
Anchor3\playground\anchor\memory.lua:84:    return string.format('%dB', n)
Anchor3\playground\anchor\memory.lua:95:  if n > 0 then return string.format('+%d', n) end

syntax OK

Fixed. The HUD line at main.lua:270 was passing fps (a fractional float like 59.94) to %d, which Lua 5.4 rejects — it now wraps it in math.floor. The bodies count comes from the C binding as a true integer, so it was fine, and the only other %d calls in the playground use integer counts.

To test: run the playground again — E:/a327ex/Anchor3/engine/build/anchor.exe E:/a327ex/Anchor3/playground. The HUD should now show bodies N fps NN at the bottom left without erroring. This was the first frame's draw call, so if anything else breaks it'll likely be further into the frame — send me the next error if one appears.

Lua draw() error: anchor/collider3.lua:102: Invalid body

A few seconds after I pressed shockwave

1    --[[
2     collider3 — thin wrapper around a Box3D physics body + shape.
3   
4     3D sibling of collider. Same design: a class bundling body + shape + tag,
5     owner back-reference, user_data set to owner.id so physics3 queries resolve
6     back to entities. Positions in meters (y-up), rotations as quaternions
7     (x, y, z, w).
8   
9     Usage:
10      function ball:new(x, y, z)
11        self.x, self.y, self.z = x, y, z
12        make_entity(self)
13        self.collider = collider3(self, 'ball', 'dynamic', 'sphere', 0.5)
14        self.collider:set_position(x, y, z)
15      end
16  
17      function ball:update(dt)
18        self.collider:sync()   -- copies position AND rotation to self
19      end
20  
21      function ball:draw(scene)
22        layer3_sphere(scene, self.x, self.y, self.z, 0.5, self.color)
23        -- or: self.collider:draw(scene, self.color) which draws the collider's
24        -- own shape at its current transform
25      end
26  
27      function ball:destroy()
28        self.collider:destroy()
29      end
30  
... [126 more lines]

The collider's body is being destroyed while the entity is still in the draw list. Let me look at the playground's kill/draw flow:

1    --[[
2     playground — Anchor 3 validation toy.
3   
4     A crate pyramid and falling balls on a flat ground, in full 3D physics
5     (Box3D) with flat-shaded instanced primitives, orbit camera, mouse picking,
6     and a 2D HUD composited on top. Exercises every 3D module: physics3,
7     collider3, layer3, camera3, math3, debug draw.
8   
9     Controls:
10      RMB drag   orbit camera          wheel      zoom
11      LMB        punch (impulse along the pick ray)
12      B          drop a ball           space      shockwave at origin
13      F1         toggle physics debug draw
14      R          reset scene
15  ]]
16  
17  require('anchor')({
18      width = 960,
19      height = 540,
20      title = "Anchor 3 playground",
21      scale = 2,
22      filter = "smooth",
23  })
24  
25  print('playground: framework loaded OK')
26  
27  -- Palette
28  bg_color     = color(24, 26, 34)
29  ground_color = color(105, 110, 125)
30  crate_color  = color(230, 165, 80)
... [248 more lines]

8799-        body_type = b2_staticBody;
8800-    } else if (strcmp(type_str, "dynamic") == 0) {
8801-        body_type = b2_dynamicBody;
8802-    } else if (strcmp(type_str, "kinematic") == 0) {
8803-        body_type = b2_kinematicBody;
8804-    } else {
8805:        return luaL_error(L, "Invalid body type: %s (use 'static', 'dynamic', or 'kinematic')", type_str);
--
8845-    }
8846-}
8847-
8848-static int l_physics_destroy_body(lua_State* L) {
8849-    b2BodyId* body_id = (b2BodyId*)lua_touserdata(L, 1);
8850-    if (!body_id) {
8851:        return luaL_error(L, "Invalid body");
--
8871-// local frames). enableSpring defaults to (hertz > 0).
8872-// ============================================================
8873-static int l_physics_create_distance_joint(lua_State* L) {
8874-    b2BodyId* body_a = (b2BodyId*)lua_touserdata(L, 1);
8875-    b2BodyId* body_b = (b2BodyId*)lua_touserdata(L, 2);
8876-    if (!body_a || !body_b || !b2Body_IsValid(*body_a) || !b2Body_IsValid(*body_b)) {
8877:        return luaL_error(L, "Invalid body for distance joint");
--
8969-    return 0;
8970-}
8971-
8972-static int l_physics_get_position(lua_State* L) {
8973-    b2BodyId* body_id = (b2BodyId*)lua_touserdata(L, 1);
8974-    if (!body_id || !b2Body_IsValid(*body_id)) {
... [2 more lines]

11228:static int l_physics3_get_position(lua_State* L) {
11229-    b3BodyId* body_id = (b3BodyId*)lua_touserdata(L, 1);
11230-    if (!body_id || !b3Body_IsValid(*body_id)) return luaL_error(L, "Invalid body");
11231-
11232-    b3Pos p = b3Body_GetPosition(*body_id);
11233-    lua_pushnumber(L, p.x);
11234-    lua_pushnumber(L, p.y);
11235-    lua_pushnumber(L, p.z);
11236-    return 3;
11237-}
11238-
11239:static int l_physics3_get_rotation(lua_State* L) {
11240-    b3BodyId* body_id = (b3BodyId*)lua_touserdata(L, 1);
11241-    if (!body_id || !b3Body_IsValid(*body_id)) return luaL_error(L, "Invalid body");
11242-
11243-    b3Quat q = b3Body_GetRotation(*body_id);
11244-    lua_pushnumber(L, q.v.x);
11245-    lua_pushnumber(L, q.v.y);
11246-    lua_pushnumber(L, q.v.z);
11247-    lua_pushnumber(L, q.s);
11248-    return 4;
11249-}

96   --[[
97    collider3:draw(scene, color)
98    Draws this collider's shape at its current physics transform into a layer3.
99    Convenience for the common "the visual IS the collider" case.
100 ]]
101 function collider3:draw(scene, color)
102   local x, y, z = physics3_get_position(self.body)
103   local qx, qy, qz, qw = physics3_get_rotation(self.body)
104   local d = self.shape_dims
105   if self.shape_type == 'sphere' then
106     layer3_sphere(scene, x, y, z, d[1], color)
107   elseif self.shape_type == 'box' then
108     layer3_box(scene, x, y, z, d[1], d[2], d[3], qx, qy, qz, qw, color)
109   elseif self.shape_type == 'capsule' then
110     layer3_capsule(scene, x, y, z, d[1], d[2], qx, qy, qz, qw, color)
111   elseif self.shape_type == 'cylinder' then
112     layer3_cylinder(scene, x, y, z, d[1], d[2], qx, qy, qz, qw, color)
113   end
114   -- 'hull' has no primitive mesh; draw it yourself or use layer3_debug_draw
115 end
116 

The file E:\a327ex\Anchor3\framework\anchor\collider3.lua has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\playground\anchor\collider3.lua has been updated successfully. (file state is current in your context — no need to Read it back)

E:/a327ex/Anchor3/framework/anchor/collider3.lua syntax OK

E:/a327ex/Anchor3/playground/anchor/collider3.lua   syntax OK

Loaded font: main (32.0px, smooth) page=1024x1024

Initialization complete. Press ESC to exit, F11 for fullscreen.

Headless loop starting...

VERIFY OK: 56 bodies, 55 crates, top crate y=4.50

Shutting down...

Fixed and headless-verified (56 bodies, pyramid settles correctly).

Root cause: the shockwave knocked a crate off the 40×40 m ground slab; a few seconds later it fell past the y < -30 kill line. kill() + process_destroy_queue() destroy the physics body at the end of that update, but the entity only leaves the crates array at the next update's dead-sweep — so draw() ran once with a corpse still in the list, and collider3:draw() queried the destroyed body. The C binding correctly rejected the stale handle with "Invalid body". The 2D collider never had this problem because its draw path uses the owner's synced x/y fields rather than querying the body live — this hazard is specific to collider3:draw's query-the-body convenience.

Fix: one guard in collider3.lua:102 (both the framework source-of-truth and the playground copy) — if not self.body then return end. A destroyed collider draws nothing, same nil-guard pattern sync() already had. The C side stays loud on stale handles, which is what you want for real lifecycle bugs; this one legit transient case is now absorbed where it belongs.

To test: run the playground, hit space a couple of times to blast crates off the edge, and wait ~5+ seconds while they fall past the kill line — no error, and the bodies counter in the HUD should tick down as they're culled. R to rebuild the pyramid afterward.

Change mouse to be the behavior where it creates a kind of joint that allows you to move the object by moving the mouse around. Then change the ball spawn to spawn from the camera position towards one of the balls in the stack randomly.

Two changes: LMB becomes a grab/drag joint, and B becomes a camera-cannon. Let me first check what joint support the vendored Box3D actually ships and what's already bound:

No matches found

1    --[[
2     camera3 — orbit camera for 3D layers. Procedural module (like camera/timer):
3     a plain table created by camera3_new, updated by explicit function calls.
4   
5     The camera orbits a target point at a distance, described by yaw (around Y)
6     and pitch (elevation). It does NOT read input itself — the game feeds it
7     deltas (mouse drag, wheel) and calls camera3_apply each frame:
8   
9       cam = camera3_new{distance = 12, pitch = 0.5}
10  
11      function update(dt)
12        if mouse_is_down(2) then                       -- RMB drag orbits
13          local dx, dy = mouse_delta()
14          camera3_orbit(cam, dx*0.008, dy*0.008)
15        end
16        camera3_zoom(cam, -mouse_wheel()*1.5)
17        camera3_apply(cam, scene)                      -- sets layer3 view/proj
18      end
19  
20    camera3_position(cam) returns the current eye point (e.g. for audio or
21    distance checks). Target can be moved directly (cam.target_x = ...) or via
22    camera3_set_target.
23  ]]
24  
25  function camera3_new(config)
26    config = config or {}
27    local cam = {
28      target_x = config.target_x or 0,
29      target_y = config.target_y or 0,
30      target_z = config.target_z or 0,
... [65 more lines]

Anchor3\engine\include\box3d\box3d.h:1027:B3_API b3JointType b3Joint_GetType( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1225:/// @see b3MotorJointDef for details
Anchor3\engine\include\box3d\box3d.h:1226:B3_API b3JointId b3CreateMotorJoint( b3WorldId worldId, const b3MotorJointDef* def );
Anchor3\engine\include\box3d\box3d.h:1229:B3_API void b3MotorJoint_SetLinearVelocity( b3JointId jointId, b3Vec3 velocity );
Anchor3\engine\include\box3d\box3d.h:1232:B3_API b3Vec3 b3MotorJoint_GetLinearVelocity( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1235:B3_API void b3MotorJoint_SetAngularVelocity( b3JointId jointId, b3Vec3 velocity );
Anchor3\engine\include\box3d\box3d.h:1238:B3_API b3Vec3 b3MotorJoint_GetAngularVelocity( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1241:B3_API void b3MotorJoint_SetMaxVelocityForce( b3JointId jointId, float maxForce );
Anchor3\engine\include\box3d\box3d.h:1244:B3_API float b3MotorJoint_GetMaxVelocityForce( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1247:B3_API void b3MotorJoint_SetMaxVelocityTorque( b3JointId jointId, float maxTorque );
Anchor3\engine\include\box3d\box3d.h:1250:B3_API float b3MotorJoint_GetMaxVelocityTorque( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1253:B3_API void b3MotorJoint_SetLinearHertz( b3JointId jointId, float hertz );
Anchor3\engine\include\box3d\box3d.h:1256:B3_API float b3MotorJoint_GetLinearHertz( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1259:B3_API void b3MotorJoint_SetLinearDampingRatio( b3JointId jointId, float damping );
Anchor3\engine\include\box3d\box3d.h:1262:B3_API float b3MotorJoint_GetLinearDampingRatio( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1265:B3_API void b3MotorJoint_SetAngularHertz( b3JointId jointId, float hertz );
Anchor3\engine\include\box3d\box3d.h:1268:B3_API float b3MotorJoint_GetAngularHertz( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1271:B3_API void b3MotorJoint_SetAngularDampingRatio( b3JointId jointId, float damping );
Anchor3\engine\include\box3d\box3d.h:1274:B3_API float b3MotorJoint_GetAngularDampingRatio( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1277:B3_API void b3MotorJoint_SetMaxSpringForce( b3JointId jointId, float maxForce );
Anchor3\engine\include\box3d\box3d.h:1280:B3_API float b3MotorJoint_GetMaxSpringForce( b3JointId jointId );
Anchor3\engine\include\box3d\box3d.h:1283:B3_API void b3MotorJoint_SetMaxSpringTorque( b3JointId jointId, float maxTorque );
Anchor3\engine\include\box3d\box3d.h:1286:B3_API float b3MotorJoint_GetMaxSpringTorque( b3JointId jointId );
Anchor3\engine\include\box3d\joint.c:58:b3MotorJointDef b3DefaultMotorJointDef( void )
Anchor3\engine\include\box3d\joint.c:60:    b3MotorJointDef def = { 0 };
Anchor3\engine\include\box3d\joint.c:141:b3JointSim* b3GetJointSimCheckType( b3JointId jointId, b3JointType type )
Anchor3\engine\include\box3d\joint.c:158:static b3JointPair b3CreateJoint( b3World* world, const b3JointDef* def, b3JointType type )
Anchor3\engine\include\box3d\joint.c:475:b3JointId b3CreateMotorJoint( b3WorldId worldId, const b3MotorJointDef* def )
Anchor3\engine\include\box3d\joint.c:487:   joint->motorJoint = (b3MotorJoint){ 0 };
Anchor3\engine\include\box3d\joint.c:500:   B3_REC_CREATE( world, CreateMotorJoint, jointId, worldId, *def );
... [12 more lines]

700:typedef struct b3MotorJointDef
701-{
702-    /// Base joint definition
703-    b3JointDef base;
704-
705-    /// The desired linear velocity
706-    b3Vec3 linearVelocity;
707-
708-    /// The maximum motor force in newtons
709-    float maxVelocityForce;
710-
711-    /// The desired angular velocity
712-    b3Vec3 angularVelocity;
713-
714-    /// The maximum motor torque in newton-meters
715-    float maxVelocityTorque;
716-
717-    /// Linear spring hertz for position control
718-    float linearHertz;
719-
720-    /// Linear spring damping ratio
721-    float linearDampingRatio;
722-
723-    /// Maximum spring force in newtons
724-    float maxSpringForce;
725-
726-    /// Angular spring hertz for position control
727-    float angularHertz;
728-
729-    /// Angular spring damping ratio
... [16 more lines]

Anchor3\engine\include\box3d\box3d.h:531:B3_API b3Vec3 b3Body_GetLocalPoint( b3BodyId bodyId, b3Pos worldPoint );
Anchor3\engine\include\box3d\box3d.h:561:B3_API b3Vec3 b3Body_GetLocalPointVelocity( b3BodyId bodyId, b3Vec3 localPoint );
Anchor3\engine\include\box3d\box3d.h:1021:B3_API void b3DestroyJoint( b3JointId jointId, bool wakeAttached );
Anchor3\engine\include\box3d\box3d.h:1024:B3_API bool b3Joint_IsValid( b3JointId id );
Anchor3\engine\include\box3d\box3d.h:1039:B3_API void b3Joint_SetLocalFrameA( b3JointId jointId, b3Transform localFrame );
Anchor3\engine\include\box3d\box3d.h:1063:B3_API void b3Joint_WakeBodies( b3JointId jointId );
Anchor3\engine\include\box3d\joint.h:348:void b3DestroyJointInternal( b3World* world, b3Joint* joint, bool wakeBodies );
Anchor3\engine\include\box3d\types.h:608:typedef struct b3JointDef

All the pieces exist. Let me see the base b3JointDef struct and the existing binding patterns to mirror:

600      b3_wheelJoint,
601 } b3JointType;
602 
603 /// Base joint definition used by all joint types. The local frames are measured from the
604 /// body's origin rather than the center of mass because:
605 /// 1. You might not know where the center of mass will be.
606 /// 2. If you add/remove shapes from a body and recompute the mass, the joints will be broken.
607 /// @ingroup joint
608 typedef struct b3JointDef
609 {
610     /// User data pointer
611     void* userData;
612 
613     /// The first attached body
614     b3BodyId bodyIdA;
615 
616     /// The second attached body
617     b3BodyId bodyIdB;
618 
619     /// The first local joint frame
620     b3Transform localFrameA;
621 
622     /// The second local joint frame
623     b3Transform localFrameB;
624 
625     /// Force threshold for joint events
626     float forceThreshold;
627 
628     /// Torque threshold for joint events
629     float torqueThreshold;
... [20 more lines]

10682:static int l_physics3_init(lua_State* L) {
10683-    if (physics3_initialized) {
10684-        return 0;
10685-    }
10686-
10687-    b3WorldDef world_def = b3DefaultWorldDef();
10688-    \ Optional gravity override: physics3_init(gx, gy, gz). Default (0,-10,0).
10689-    if (lua_gettop(L) >= 3) {
10690-        world_def.gravity.x = (float)luaL_checknumber(L, 1);
10691-        world_def.gravity.y = (float)luaL_checknumber(L, 2);
10692-        world_def.gravity.z = (float)luaL_checknumber(L, 3);
10693-    }
10694-    \ Note: unlike the 2D world we keep Box3D's default restitutionThreshold —
10695-    // zeroing it makes resting 3D contacts micro-bounce. Use
10696-    // physics3_set_restitution_threshold to change it.
10697-
10698-    physics3_world = b3CreateWorld(&world_def);
10699-    b3World_SetCustomFilterCallback(physics3_world, physics3_custom_filter, NULL);
10700-    physics3_initialized = true;
10701-    shape3_user_data_count = 0;
10702-    shape3_user_data_free_count = 0;
10703-    printf("Physics3 initialized (Box3D)\n");
10704-    return 0;
10705-}
10706-
10707-static int l_physics3_set_gravity(lua_State* L) {
10708-    if (!physics3_initialized) {
10709-        return luaL_error(L, "Physics3 not initialized. Call physics3_init() first.");
10710-    }
10711-    b3Vec3 gravity = {
... [83 more lines]

All pieces confirmed. Now let me check the motor joint defaults, the b3Transform type, and the registration block, then implement:

58   b3MotorJointDef b3DefaultMotorJointDef( void )
59  {
60      b3MotorJointDef def = { 0 };
61      def.base = b3DefaultJointDef();
62      return def;
63  }
64  
65  b3FilterJointDef b3DefaultFilterJointDef( void )
66  {
67      b3FilterJointDef def = { 0 };
68      def.base = b3DefaultJointDef();
69      return def;
70  }
71  
72  b3PrismaticJointDef b3DefaultPrismaticJointDef( void )
73  {
74      b3PrismaticJointDef def = { 0 };
75      def.base = b3DefaultJointDef();
76      return def;
77  }
78  
79  b3RevoluteJointDef b3DefaultRevoluteJointDef( void )
80  {
81      b3RevoluteJointDef def = { 0 };
82      def.base = b3DefaultJointDef();

E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-58-{
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-59- b3Vec3 v;
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-60- float s;
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-61-} b3Quat;
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-62-
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-63-/// A rigid transform.
Anchor3\engine\include\box3d\math_functions.h:64:typedef struct b3Transform
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-65-{
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-66- b3Vec3 p;
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-67- b3Quat q;
Anchor3\engine\include\box3d\math_functions.h:68:} b3Transform;
--
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-117-
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-118-static const b3Vec3 b3Vec3_zero = { 0.0f, 0.0f, 0.0f };
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-119-static const b3Vec3 b3Vec3_one = { 1.0f, 1.0f, 1.0f };
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-120-static const b3Vec3 b3Vec3_axisX = { 1.0f, 0.0f, 0.0f };
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-121-static const b3Vec3 b3Vec3_axisY = { 0.0f, 1.0f, 0.0f };
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-122-static const b3Vec3 b3Vec3_axisZ = { 0.0f, 0.0f, 1.0f };
Anchor3\engine\include\box3d\math_functions.h:123:static const b3Quat b3Quat_identity = { { 0.0f, 0.0f, 0.0f }, 1.0f };
Anchor3\engine\include\box3d\math_functions.h:124:static const b3Transform b3Transform_identity = { { 0.0f, 0.0f, 0.0f }, { { 0.0f, 0.0f, 0.0f }, 1.0f } };
--
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-516-    {
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-517-        float s = 1.0f / sqrtf( lengthSq );
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-518-        b3Quat qn = { { s * q.v.x, s * q.v.y, s * q.v.z }, s * q.s };
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-519-        return qn;
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-520-    }
E:\a327ex\Anchor3\engine\include\box3d\math_functions.h-521-
Anchor3\engine\include\box3d\math_functions.h:522:  return b3Quat_identity;

14621-    lua_register(L, "physics3_get_sensor_end", l_physics3_get_sensor_end);
14622-    lua_register(L, "physics3_query_point", l_physics3_query_point);
14623:    lua_register(L, "physics3_query_sphere", l_physics3_query_sphere);
14624-    lua_register(L, "physics3_query_aabb", l_physics3_query_aabb);
14625-    lua_register(L, "physics3_query_box", l_physics3_query_box);
14626-    lua_register(L, "physics3_query_capsule", l_physics3_query_capsule);
14627:    lua_register(L, "physics3_raycast", l_physics3_raycast);
14628-    lua_register(L, "physics3_raycast_all", l_physics3_raycast_all);
14629-    // --- Layer3 (3D scene rendering) ---

670:static b3WorldId physics3_world = {0};
671:static bool physics3_initialized = false;
672-static bool physics3_enabled = true;
673-
674-// 3D tag system (same PhysicsTag struct, separate registry)
675-static PhysicsTag physics3_tags[MAX_PHYSICS_TAGS];
676-static int physics3_tag_count = 0;
677-
678-// Per-shape user data pool for 3D shapes (same recycling scheme as 2D)
679-static ShapeUserData shape3_user_data_pool[MAX_SHAPE_USER_DATA];
680-static int shape3_user_data_count = 0;
681-static int shape3_user_data_free_list[MAX_SHAPE_USER_DATA];
682-static int shape3_user_data_free_count = 0;
683-
684-// Static collision geometry (meshes, height fields) is REFERENCED by Box3D
685-// shapes, not cloned — the allocation must outlive the shape (see the
--
10891:static int l_physics3_destroy_body(lua_State* L) {
10892-    b3BodyId* body_id = (b3BodyId*)lua_touserdata(L, 1);
10893-    if (!body_id) {
10894-        return luaL_error(L, "Invalid body");
10895-    }
10896-
10897-    if (b3Body_IsValid(*body_id)) {
10898-        b3ShapeId shapes[32];
10899-        int n = b3Body_GetShapeCount(*body_id);
10900-        if (n > 32) n = 32;
10901-        int actual = b3Body_GetShapes(*body_id, shapes, n);
10902-        for (int i = 0; i < actual; i++) shape3_user_data_recycle(shapes[i]);
10903-        b3DestroyBody(*body_id);
... [2 more lines]

10903            b3DestroyBody(*body_id);
10904       }
10905       return 0;
10906   }
10907   
10908   static int l_physics3_body_is_valid(lua_State* L) {
10909       b3BodyId* body_id = (b3BodyId*)lua_touserdata(L, 1);
10910       lua_pushboolean(L, body_id && b3Body_IsValid(*body_id));
10911       return 1;
10912   }
10913   
10914   static int l_physics3_get_body_count(lua_State* L) {
10915       if (!physics3_initialized) {
10916           lua_pushinteger(L, 0);
10917           return 1;
10918       }
10919       b3Counters counters = b3World_GetCounters(physics3_world);
10920       lua_pushinteger(L, counters.bodyCount);
10921       return 1;
10922   }
10923   
10924   static void setup_shape3_def_from_tag(b3ShapeDef* def, PhysicsTag* tag, bool is_sensor) {

Now implementing. C side first — three edits: globals, the joint bindings, and registration:

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

src/anchor.c(15357): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(15361): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(15367): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(15371): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(15377): warning C4996: 'strcpy': This function or variable may be unsafe. Consider using strcpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(15381): warning C4996: 'strcat': This function or variable may be unsafe. Consider using strcat_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(16042): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(16044): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(16047): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

src/anchor.c(16050): warning C4996: 'strncpy': This function or variable may be unsafe. Consider using strncpy_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.

gl.c

Generating Code...

LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library

Build successful: build/anchor.exe

[setup_ffmpeg] DLLs already present in build\

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

Adding the grab state declaration with the other globals, then verifying:

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

syntax OK

Headless loop starting...

VERIFY OK: 56 bodies, 55 crates, top crate y=4.50

Shutting down...

Headless verify passes. Let me document the new joint API in the 3D docs:

9:## physics3 (C bindings)
84:## layer3 (C bindings; framework wrapper shadows these — see below)
105:## Framework modules
127:## Frame shape (3D game)
148:## Known-untested (visually) as of 2026-07-07

60   physics3_add_heightfield_wave(body, tag, rows, cols, sx, sy, sz, row_freq, col_freq) -> shape  -- static only
61  physics3_add_grid_mesh(body, tag, x_count, z_count, cell_width) -> shape                       -- static only
62  physics3_shape_set_friction / set_restitution / set_density (shape, v)  (+ get_*)
63  physics3_shape_is_valid / shape_get_body / shape_destroy / shape_set_filter_group
64  ```
65  
66  Events (drained per fixed step, same model as 2D; points/normals 3D):
67  ```
68  physics3_get_collision_begin(tag_a, tag_b) -> {{body_a, body_b, shape_a, shape_b,
69      tag_a, tag_b, point_x/y/z, normal_x/y/z}, ...}
70  physics3_get_collision_end(tag_a, tag_b)
71  physics3_get_hit(tag_a, tag_b)               -- + approach_speed (m/s)
72  physics3_get_sensor_begin / physics3_get_sensor_end(sensor_tag, visitor_tag)
73  ```
74  
75  Queries & rays (tags = array of tag names):
76  ```
77  physics3_query_point(x, y, z, tags) -> bodies
78  physics3_query_sphere(x, y, z, r, tags)      physics3_query_aabb(min_xyz..., max_xyz..., tags)
79  physics3_query_box(x, y, z, w, h, d, tags)   physics3_query_capsule(x, y, z, height, r, tags)
80  physics3_raycast(x1, y1, z1, x2, y2, z2, tags) -> {body, shape, tag, point_x/y/z, normal_x/y/z, fraction} | nil
81  physics3_raycast_all(...) -> array of the same
82  ```
83  
84  ## layer3 (C bindings; framework wrapper shadows these — see below)
85  
86  ```
87  layer3_create(name) -> l3                 -- renders into a standard Layer's FBO
88  layer3_get_layer(l3) -> layer             -- composite/post-process via ALL layer_* functions
89  layer3_camera(l3, ex, ey, ez, tx, ty, tz, fov_deg, [near=0.1], [far=500])
... [15 more lines]

The file E:\a327ex\Anchor3\docs\3D_API.md has been updated successfully. (file state is current in your context — no need to Read it back)

1:# Anchor 3 Plan
12:## Status
46:## Decisions log
58:## Box3D notes (from header study, pinned commit)

12   ## Status
13  
14  - [x] **Phase 0 — Scaffold** (2026-07-07): Anchor3/ created from Anchor2 copy (engine
15    src/include/lib, framework, FFmpeg DLLs copied not re-downloaded, build.bat stripped of the
16    emoji-ball-battles deploy step). Baseline build green.
17  - [x] **Phase 1 — Vendor Box3D** (2026-07-07): pinned commit `52f1a254ad62a74c9f2a80052f436e2263b95214`
18    (2026-07-06 "Name cache (#53)"), flattened into engine/include/box3d (box2d pattern),
19    box3d.lib section added to build.bat, links clean into anchor.exe.
20  - [x] **Phase 2 — C math section** (2026-07-07): mat4 (column-major GL) multiply/perspective/
21    look-at/general-invert, quat→mat3, quat from-to; lives at the top of the LAYER3 section.
22  - [x] **Phase 3 — physics3 bindings** (2026-07-07): 72 bindings mirroring the 2D surface.
23    `test-physics3/` headless suite green (28 physics tests). Deferred: joints (Box3D has
24    distance/revolute/prismatic/spherical/motor/weld/wheel/parallel — bind on demand),
25    shape casts, custom-heights heightfield, compound shapes, mover/character API.
26  - [x] **Phase 4+5 — layer3** (2026-07-07): 3D scene pass into a standard Layer's FBO (depth
27    already present via the DEPTH24_STENCIL8 stencil RBO) → composites through the normal
28    layer chain, post-process shaders work on 3D scenes. Instanced flat-shaded unit meshes
29    (box/sphere/hemisphere/cylinder/cylinder_open/plane; capsule = 3 instances), Lambert +
30    ambient, 3D line batch, Box3D debug draw wired (solid colliders + segment fallbacks),
31    perspective look-at camera, unproject. Camera math + screen-center picking verified
32    headless (31/31 total tests).
33  - [x] **Phase 6 — framework modules** (2026-07-07): math3, layer3 (wrapper w/ shadowing like
34    layer.lua), collider3 (class, sync copies pos+rot, :draw), camera3 (orbit; input fed by
35    game), physics3 (entity-resolving event/query wrappers). Registered in init.lua.
36  - [x] **Phase 7 — playground toy** (2026-07-07, code-complete): 55-crate pyramid + dropped
37    balls on flat ground; RMB orbit / wheel zoom / LMB punch via pick ray / B ball /
38    space shockwave (query+impulses) / F1 debug draw / R reset; 2D HUD composited on top.
39    Headless verify: pyramid settles standing after 300 steps (56 bodies, top at y=4.50).
40    ⏳ **Visual verification pending — first windowed run is the user's** (see docs/3D_API.md
41    "Known-untested" for what to eyeball: lighting, debug-box extents, winding).
... [4 more lines]

The file E:\a327ex\Anchor3\reference\plan.md has been updated successfully. (file state is current in your context — no need to Read it back)

Done, built, and headless-verified. Two changes:

LMB grab-and-drag. Box3D ships no mouse joint, so I used its motor joint with only the linear spring active — this is exactly the Box2D v3-era replacement for the classic mouse joint. Four new C bindings (documented in 3D_API.md): physics3_create_grab_joint(body, px, py, pz, [opts]), physics3_joint_set_target, physics3_destroy_joint, physics3_joint_is_valid. The joint connects the body to a hidden shapeless static body at the origin (created lazily on first grab) — since that anchor sits at the origin with identity rotation, world-space targets pass straight through as its local frame, no transform math per drag frame. Defaults: spring hertz 5, damping 0.7, max force 1000×mass (mass-scaled so a heavy crate and a light ball feel equally responsive). Rotation is left free — grabbed bodies swing and tumble around the grab point like the classic 2D mouse joint.

In the playground: clicking raycasts, creates the joint at the exact hit point, and remembers the hit's distance from the camera; while held, the target rides at that distance along the current mouse ray — so you can also RMB-orbit mid-drag and the object follows the view. Releasing destroys the joint. If the body dies under you (R-reset while holding), Box3D auto-destroys the joint and the joint_is_valid guard clears the grab cleanly.

B is now a cannon. It spawns a ball ~2 m in front of the camera eye (camera3_position) and fires it at 30 m/s toward a random crate in the pyramid (falling back to the stack origin if no crates remain). One interpretation note: you said "towards one of the balls in the stack" — the stack is made of crates, so I aimed at random crates; say the word if you actually wanted it aimed at existing balls.

To test: rebuild is already done — just run the playground. Try: drag a crate out of the middle of the pyramid and watch it collapse; drag a ball around fast and release to fling it; hold a crate while pressing R (should not error); spam B from different orbit angles and watch balls arc into the stack. The HUD bottom line will read bodies 57 after your first grab — that's the hidden world-anchor body, expected.

Aim at mouse instead of random box, make the balls a bit faster and heavier.

11075:static int l_physics3_add_sphere(lua_State* L) {
11076-    if (!physics3_initialized) return luaL_error(L, "Physics3 not initialized");
11077-
11078-    b3BodyId* body_id = (b3BodyId*)lua_touserdata(L, 1);
11079-    if (!body_id) return luaL_error(L, "Invalid body");
11080-
11081-    const char* tag_name = luaL_checkstring(L, 2);
11082-    PhysicsTag* tag = physics3_tag_get_by_name(tag_name);
11083-    if (!tag) return luaL_error(L, "Unknown physics3 tag: %s", tag_name);
11084-
11085-    float radius = (float)luaL_checknumber(L, 3);
11086-
11087-    bool is_sensor;
11088-    b3Vec3 offset;
11089-    parse_shape3_opts(L, 4, &is_sensor, &offset);
11090-
11091-    b3ShapeDef shape_def = b3DefaultShapeDef();
11092-    setup_shape3_def_from_tag(&shape_def, tag, is_sensor);
11093-
11094-    b3Sphere sphere = { .center = offset, .radius = radius };
11095-    b3ShapeId shape_id = b3CreateSphereShape(*body_id, &shape_def, &sphere);
11096-    return finish_shape3(L, shape_id, tag);
11097-}
11098-
11099-// physics3_add_box(body, tag, width, height, depth, [opts]) -> shape
11100-// A box is a convex hull in Box3D; hull data is cloned into the shape.
11101-static int l_physics3_add_box(lua_State* L) {
11102-    if (!physics3_initialized) return luaL_error(L, "Physics3 not initialized");
11103-
11104-    b3BodyId* body_id = (b3BodyId*)lua_touserdata(L, 1);
... [11 more lines]

11668:static int l_physics3_shape_set_density(lua_State* L) {
11669-    b3ShapeId* shape_id = (b3ShapeId*)lua_touserdata(L, 1);
11670-    if (!shape_id || !b3Shape_IsValid(*shape_id)) return luaL_error(L, "Invalid shape");
11671-    b3Shape_SetDensity(*shape_id, (float)luaL_checknumber(L, 2), true);
11672-    return 0;
11673-}
11674-
11675-static int l_physics3_shape_get_density(lua_State* L) {
11676-    b3ShapeId* shape_id = (b3ShapeId*)lua_touserdata(L, 1);

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\playground\main.lua has been updated successfully. (file state is current in your context — no need to Read it back)

syntax OK

Headless loop starting...

VERIFY OK: 56 bodies, 55 crates, top crate y=4.50

Shutting down...

Done, verified — all Lua-side, no rebuild needed. Three changes in main.lua:

1. B now fires along the mouse ray — the ball spawns 2 m in front of the camera and flies exactly at the cursor (same camera3_mouse_ray unproject the grab uses), instead of auto-targeting a random crate.
2. Speed 30 → 40 m/s.
3. Density 1000 → 2000 (2× Box3D's default) via set_density right after the ball's shape is created — the binding passes updateBodyMass = true to Box3D, so mass actually doubles. The grab joint's default max force is computed from mass at grab time, so heavier balls remain draggable with the same feel.

To test: run the playground, point the cursor at the top of the pyramid and tap B — the ball should hit exactly where the cursor is, and with 2× mass at 40 m/s it should punch through the stack noticeably harder than before. Grab a ball with LMB afterward to confirm dragging still feels the same despite the added weight.

This is rather nice and proof that it works. From an architectural perspective is there any big thing missing? Could we actually make an arena shooting game out of what we have now?

Good question to ask at exactly this point. Let me verify a couple of engine facts before answering — specifically mouse capture (the thing an FPS camera would need) and what mouse_delta actually is:

12660:    SDL_ShowCursor(visible ? SDL_ENABLE : SDL_DISABLE);
12666:    SDL_SetRelativeMouseMode(grabbed ? SDL_TRUE : SDL_FALSE);
12671:// motion (unlike mouse_set_grabbed / SDL_SetRelativeMouseMode). This is the
12676:    SDL_SetWindowGrab(window, grabbed ? SDL_TRUE : SDL_FALSE);

12644:static int l_mouse_delta(lua_State* L) {
12645-    // Delta is in window pixels, scale to game pixels
12646-    int window_w, window_h;
12647-    SDL_GetWindowSize(window, &window_w, &window_h);
12648-    float scale_x = (float)window_w / game_width;
12649-    float scale_y = (float)window_h / game_height;
12650-    float scale = (scale_x < scale_y) ? scale_x : scale_y;
--
15600:        if (event.type == SDL_MOUSEMOTION) {
15601-            last_input_type = INPUT_TYPE_MOUSE;
15602-            mouse_x = event.motion.x;
15603-            mouse_y = event.motion.y;
15604:            mouse_dx += event.motion.xrel;
15605-            mouse_dy += event.motion.yrel;
15606-        }
15607-        // Track mouse buttons
15608-        if (event.type == SDL_MOUSEBUTTONDOWN) {
15609-            last_input_type = INPUT_TYPE_MOUSE;
15610-            #ifdef __EMSCRIPTEN__

Short answer: no, there's no big architectural hole left — and yes, an arena shooter is buildable from what exists today. I checked the two things I suspected might be gaps, and one of them turned out to be already solved: the engine (inherited from Anchor 2) already has mouse_set_grabbed (SDL relative mouse mode), cursor hiding, and mouse_delta accumulates raw xrel/yrel motion — so even first-person mouse look needs zero engine work. The playground has now exercised the full loop end to end: fixed-step physics → events → picking → instanced rendering → 2D HUD composite.

What an arena shooter actually adds, sorted by weight:

Small real gaps (all Lua, no C):

• Camera modes. camera3 is orbit-only. An FPS camera (eye position + yaw/pitch look direction, fed by relative mouse deltas) or a third-person follow camera is each maybe 30–40 lines in camera3. This is the only genuine framework gap.
• Player movement. There's no character-controller API, but for a flat arena you don't want one: the standard solution is a dynamic capsule with angular motion locked (set_motion_locks — already bound), velocity-driven WASD relative to camera yaw, a downward raycast for grounded/jump. This is exactly the regime where Box3D's alpha weaknesses (character mover, ghost collisions on meshes) never bite — flat ground, primitive shapes. A walking-character game on real terrain would wait for Box3D to mature; an arena doesn't.
• Everything shooting-related already exists: hitscan = physics3_raycast with tags; projectiles = the cannonballs you just fired (with set_bullet for fast ones); damage = collision/hit events resolving to entities via user_data; knockback = impulses.

Nice-to-haves that will matter quickly but don't block:

• Blob shadows. The single biggest readability item for 3D aiming — flat-shaded objects over a flat floor float ambiguously without them. A flattened dark cylinder at y≈0.01 under each body does it with current primitives; real shadow mapping stays out of scope.
• Particles. No engine particle system, but none needed: plain Lua {pos, vel, life} tables drawn as tiny instanced spheres/boxes are effectively free (the 4096-per-mesh instance cap is the only ceiling, and it's a raiseable constant).
• Audio. 2D audio works; distance-based volume falloff hand-rolled in Lua covers an arena. Real spatialization (miniaudio has it built in) is a later engine item.
• Juice carries over: springs, shake, flash colors — all dimension-agnostic; camera3 shake is a few lines of eye offset.

The one engine-architecture item to keep an eye on (not build now): physics bodies move at the fixed physics rate while the camera updates per frame — on a high-refresh display, fast projectiles may visibly step. The fix is storing previous transforms and interpolating render positions, which is an engine-level addition. Flag it, watch for it in play, build it only if you actually see it.

Genuinely absent but irrelevant to an arena: pathfinding/navmesh (open arena = steer-at-player, genre-standard), transparency sorting, compound multi-shape colliders (single-shape enemies are fine; headshots can be "hit point above height h" on one capsule).

So the honest framing: the engine work is done for this genre; what remains is a game. Player entity, a weapon, wave spawner, health/death, restart state — all patterns you've shipped many times in 2D, nothing structurally new. The fork that decides the next concrete step is which shooter:

• (a) First-person, Devil-Daggers-shaped — needs the FPS camera mode in camera3 (small), mouse grab toggle, then it's pure game code. Most convincing proof that "Anchor does 3D now."
• (b) Top-down / orbit twin-stick — needs literally nothing new; closest to your SNKRX DNA and the fastest to fun.
• (c) Third-person over-shoulder — the follow camera plus aim-reticle math makes it the fiddliest of the three; I'd not start here.

My lean: (a) if the point is to stress what 3D adds (look-aiming, verticality, spatial readability — it'll also surface the interpolation and shadow questions fastest), (b) if the point is to reach a fun loop in the fewest sessions. Your call — and also whether it lives in the playground or starts as its own folder inside Anchor3.

We're not going to build any games out of this, I just wanted to see if you could do this and you did it in like 2 turns which is insane lol Let's make sure this example builds on the web, then I want it to be playable on the website as a new post, after the end session post containing this log, Fable Test --- Anchor 3D (--- is em-dash). So, do the web work first, then end the session (not privately nor secretly), publish it, then after that do the work needed to publish the game web view as a new message after the AI LOG one.

Understood — three phases in order: (1) get the playground building and running on the web, (2) end the session publicly as "Fable Test — Anchor 3D", (3) host the game on a327ex.com and post it as a homepage message after the log. The silo opens only for the publishing step; Anchor2 stays untouched (I'll read its web-build scripts as reference, adapting copies into Anchor3).

Task #9 created successfully: Anchor3 web engine build (box3d under emcc)

Task #10 created successfully: Package playground for web + smoke test

Task #11 created successfully: End session publicly: "Fable Test — Anchor 3D"

Task #12 created successfully: Publish playable game on a327ex.com + /msg post

Updated task #9 status

1    # Anchor2 Web Deploy
2   
3   Compile Anchor2 games to WebAssembly and embed them as iframes on a website. This document covers the build pipeline, the per-game shell HTML behavior, and integration with the current host (`anchor.blot.im`) plus the eventual replacement (`Anchor2/app`).
4   
5   ---
6   
7   ## Architecture at a glance
8   
9   The deploy is split into two artifacts so multiple games can share one engine download:
10  
11  ```
12  shared engine (built once per engine code change)
13  ├── anchor.js     ~240 KB   Emscripten runtime + engine bindings
14  └── anchor.wasm   ~1.8 MB   compiled engine binary
15  
16  per-game (one folder per game)
17  ├── <game>.data   ~50 KB-few MB   game's preloaded VFS (Lua + assets)
18  ├── <game>.js     ~7 KB           file_packager output that registers the data
19  └── index.html    ~5 KB           shell that loads engine + data and runs it
20  ```
21  
22  A typical first-game cost is ~2.5 MB total. Subsequent games cost only their `<game>.data` because the browser caches `anchor.js`/`anchor.wasm`.
23  
24  ---
25  
26  ## Build pipeline
27  
28  ### Step 1: build the shared engine
29  
30  ```bash
... [197 more lines]

1    #!/bin/bash
2   # Anchor Engine - Web Build (engine-only, no preloaded game)
3   #
4   # Builds the shared engine artifacts (anchor.js + anchor.wasm) once.
5   # Per-game data is packaged separately by scripts/package-web-game.sh.
6   #
7   # This is the multi-game architecture: many games share one engine
8   # download, each game ships only its own .data + a tiny index.html.
9   #
10  # Usage: ./build-web-engine.sh
11  
12  cd "$(dirname "$0")"
13  
14  mkdir -p build-web-engine
15  
16  # Compile our own FreeType (2.14.1, bytecode + subpixel hinting) to lib/libfreetype-web.a
17  # so the WASM build renders text IDENTICALLY to desktop. Emscripten's -sUSE_FREETYPE port
18  # is an older version with a different hinting config and made web text lighter/softer.
19  # No-op once the lib exists (delete it or pass --force to rebuild).
20  ./setup_freetype_web.sh
21  
22  # Build with Emscripten — no --preload-file, no --shell-file.
23  # FORCE_FILESYSTEM=1 ensures FS module is included even though no preload.
24  # Per-game .js (from file_packager) will populate FS at runtime.
25  /c/emsdk/upstream/emscripten/emcc.bat \
26      -O2 \
27      -DNDEBUG \
28      -DBOX2D_DISABLE_SIMD \
29      -I"include" -I"include/SDL2" -I"include/lua" -I"include/stb" -I"include/box2d" -I"include/freetype" \
30      src/anchor.c \
... [24 more lines]

Exit code 2
E:/a327ex/Anchor3:
docs
engine
framework
playground
reference
test-physics3

E:/a327ex/Anchor3/engine:
anchor.obj
build
build.bat
gl.obj
include
lib
run.bat
setup_ffmpeg.bat
src

Anchor3\engine\include\box3d\world_snapshot.c:4:#if defined( _MSC_VER ) && !defined( _CRT_SECURE_NO_WARNINGS )
Anchor3\engine\include\box3d\base.h:42:#if defined( _MSC_VER )
Anchor3\engine\include\box3d\base.h:56:#if defined( _MSC_VER )
Anchor3\engine\include\box3d\base.h:112:#if defined( _MSC_VER )
Anchor3\engine\include\box3d\recording.c:4:#if defined( _MSC_VER ) && !defined( _CRT_SECURE_NO_WARNINGS )
Anchor3\engine\include\box3d\verstable.h:498:#elif defined( _MSC_VER ) && ( defined( _M_X64 ) || defined( _M_ARM64 ) )
Anchor3\engine\include\box3d\verstable.h:571:#elif defined( _MSC_VER ) && defined( _M_X64 )
Anchor3\engine\include\box3d\verstable.h:946:#elif defined( _MSC_VER )
Anchor3\engine\include\box3d\verstable.h:991:#ifdef _MSC_VER // In MSVC, the compound literal in the _Generic triggers a warning about unused local variables at /W4.
Anchor3\engine\include\box3d\verstable.h:1012:#ifdef _MSC_VER
Anchor3\engine\include\box3d\verstable.h:1386:#elif defined( _MSC_VER )
Anchor3\engine\include\box3d\core.h:50:#if defined( BOX3D_DISABLE_SIMD )
Anchor3\engine\include\box3d\core.h:51: #define B3_SIMD_NONE
Anchor3\engine\include\box3d\core.h:52: #define B3_SIMD_WIDTH 4
Anchor3\engine\include\box3d\core.h:53: //#pragma message("B3_SIMD_NONE")
Anchor3\engine\include\box3d\core.h:56:     #define B3_SIMD_SSE2
Anchor3\engine\include\box3d\core.h:57:     #define B3_SIMD_WIDTH 4
Anchor3\engine\include\box3d\core.h:58:     //#pragma message("B3_SIMD_SSE2")
Anchor3\engine\include\box3d\core.h:60:     #define B3_SIMD_NEON
Anchor3\engine\include\box3d\core.h:61:     #define B3_SIMD_WIDTH 4
Anchor3\engine\include\box3d\core.h:62:     //#pragma message("B3_SIMD_NEON")
Anchor3\engine\include\box3d\core.h:65:     #define B3_SIMD_SSE2
Anchor3\engine\include\box3d\core.h:66:     #define B3_SIMD_WIDTH 4
Anchor3\engine\include\box3d\core.h:67:     //#pragma message("B3_SIMD_SSE2")
Anchor3\engine\include\box3d\core.h:69:     #define B3_SIMD_NONE

[Showing results with pagination = limit: 25]

E:/a327ex/Anchor3/engine/include:
box2d
box3d
freetype
ft2build.h
glad
KHR
libavcodec
libavfilter
libavformat
libavutil
libswresample
libswscale
lua
miniaudio.h
miniz.h
SDL2
stb
stb_vorbis.c

E:/a327ex/Anchor3/engine/lib:
avcodec.lib
avfilter.lib
avformat.lib
avutil.lib
box2d.lib
box3d.lib
freetype.lib
libfreetype-web.a
lua.lib
... [17 more lines]

1    #!/bin/bash
2   # Anchor2 - Package a game for the shared-engine web architecture.
3   #
4   # Produces a per-game folder containing:
5   #   <name>.data    — the game's preloaded files (Lua + assets)
6   #   <name>.js      — Emscripten file_packager output that registers the data
7   #   index.html     — minimal shell that loads the shared engine + this game
8   #
9   # The shared engine artifacts (anchor.js + anchor.wasm) are built once by
10  # engine/build-web-engine.sh and hosted at $ENGINE_URL (default below).
11  #
12  # Usage:
13  #   ./package-web-game.sh <game-folder> <output-folder> [engine-url]
14  #
15  # Example:
16  #   ./package-web-game.sh ../arena ../engine/build-web-games/arena
17  #   ./package-web-game.sh ../arena ../engine/build-web-games/arena /files/anchor2-engine
18  
19  set -e
20  
21  GAME_FOLDER="$1"
22  OUT_DIR="$2"
23  ENGINE_URL="${3:-/files/anchor2-engine}"
24  
25  if [ -z "$GAME_FOLDER" ] || [ -z "$OUT_DIR" ]; then
26      echo "Usage: ./package-web-game.sh <game-folder> <output-folder> [engine-url]"
27      exit 1
28  fi
29  
30  if [ ! -d "$GAME_FOLDER" ]; then
... [175 more lines]

89:#include <box3d.h>

/c/emsdk/upstream/emscripten/emcc.bat
50

File created successfully at: E:\a327ex\Anchor3\engine\build-web-engine.sh (file state is current in your context — no need to Read it back)

 13855 |     window.__anchorNavPop = '';

       |                             ^

src/anchor.c:13878:48: warning: empty character constant [-Winvalid-pp-token]

 13878 |     stringToUTF8((typeof v === 'string') ? v : '', buf, n);

       |                                                ^

src/anchor.c:13929:69: warning: empty character constant [-Winvalid-pp-token]

 13929 |             .catch(function () { Module.__httpRes[id] = { s: -1, b: '' }; });

       |                                                                     ^

src/anchor.c:13930:54: warning: empty character constant [-Winvalid-pp-token]

 13930 |     } catch (e) { Module.__httpRes[id] = { s: -1, b: '' }; }

       |                                                      ^

In file included from src/anchor.c:16515:

include\stb_vorbis.c:1404:75: warning: pointer comparison always evaluates to false [-Wtautological-compare]

 1404 |       if (f->stream_start + loc >= f->stream_end || f->stream_start + loc < f->stream_start) {

      |                                                                           ^

13 warnings generated.


Engine build successful:
total 2660
drwxr-xr-x 1 adn 197121       0 Jul  7 20:23 .
drwxr-xr-x 1 adn 197121       0 Jul  7 20:22 ..
-rw-r--r-- 1 adn 197121  243232 Jul  7 20:23 anchor.js
-rw-r--r-- 1 adn 197121 2470278 Jul  7 20:23 anchor.wasm

Next: package a game with scripts/package-web-game.sh

Updated task #9 status

Updated task #10 status

File created successfully at: E:\a327ex\Anchor3\scripts\package-web-game.sh (file state is current in your context — no need to Read it back)

file_packager: warning: Remember to build the main file with `-sFORCE_FILESYSTEM` so that it includes support for loading this file package


Game packaged: ../engine/build-web-games/playground
total 192
drwxr-xr-x 1 adn 197121      0 Jul  7 20:24 .
drwxr-xr-x 1 adn 197121      0 Jul  7 20:24 ..
-rw-r--r-- 1 adn 197121   5906 Jul  7 20:24 index.html
-rw-r--r-- 1 adn 197121 179448 Jul  7 20:24 playground.data
-rw-r--r-- 1 adn 197121   7521 Jul  7 20:24 playground.js

Engine URL:    .
Game size:     960 x 540 (auto)

Packaged (179 KB of game data). Now the smoke test — serving it locally and checking in the preview browser:

<tool_use_error>File has not been read yet. Read it first before writing to it.</tool_use_error>

1    {
2     "version": "0.0.1",
3     "configurations": [
4       {
5         "name": "renderer-web",
6         "runtimeExecutable": "python",
7         "runtimeArgs": ["a327ex-site/renderer/tools/serve-web.py", "8001"],
8         "port": 8001
9       }
10    ]
11  }
12  

The file E:\a327ex\.claude\launch.json has been updated successfully. (file state is current in your context — no need to Read it back)

[
  {
    "type": "text",
    "text": "{\n  \"serverId\": \"8a612336-01c2-4755-9704-9b560c76b233\",\n  \"port\": 8321,\n  \"name\": \"anchor3-web-playground\",\n  \"reused\": false,\n  \"previewId\": \"8a612336-01c2-4755-9704-9b560c76b233\",\n  \"tabId\": \"seed\"\n}\nServer started successfully on port 8321."
  }
]

[
  {
    "type": "text",
    "text": "[log] playground: framework loaded OK\n[log] playground: framework loaded OK\n[log] playground: framework loaded OK\n[log] playground: framework loaded OK\n[log] Physics3 initialized (Box3D)\n[log] Physics3 initialized (Box3D)\n[log] Physics3 initialized (Box3D)\n[log] Physics3 initialized (Box3D)\n[log] Physics3 initialized (Box3D)\n[log] Physics3 initialized (Box3D)\n[log] Created layer: scene__3d (smooth)\n[log] Created layer: scene__3d (smooth)\n[log] Created layer: scene__3d (smooth)\n[log] Created layer: scene__3d (smooth)\n[log] Created layer: scene__3d (smooth)\n[log] Created layer: scene__3d (smooth)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n\n(Showing last 40 of 204 entries. Use 'lines' parameter (max 200) to see more.)"
  }
]

[
  {
    "type": "text",
    "text": "No console logs."
  }
]

[
  {
    "type": "image",
    "note": "[image stored privately: vault/media/fable-test-anchor-3d/001.jpg]"
  }
]

[
  {
    "type": "text",
    "text": "Successfully clicked: #canvas"
  }
]

[
  {
    "type": "image",
    "note": "[image stored privately: vault/media/fable-test-anchor-3d/002.jpg]"
  }
]

[
  {
    "type": "text",
    "text": "Viewport reset to native size (desktop)."
  }
]

[
  {
    "type": "text",
    "text": "\"shockwave dispatched\""
  }
]

[
  {
    "type": "image",
    "note": "[image stored privately: vault/media/fable-test-anchor-3d/003.jpg]"
  }
]

[
  {
    "type": "text",
    "text": "{\"tagName\":\"canvas\",\"text\":\"\",\"className\":\"\",\"id\":\"canvas\",\"styles\":{\"width\":\"892px\",\"height\":\"501px\",\"transform\":\"matrix(1, 0, 0, 1, -446, -250.5)\",\"position\":\"absolute\",\"top\":\"464px\",\"left\":\"446px\"},\"boundingBox\":{\"x\":0,\"y\":213.5,\"width\":892,\"height\":501}}"
  }
]

[
  {
    "type": "text",
    "text": "\"{\\\"attr_w\\\":892,\\\"attr_h\\\":501,\\\"style_w\\\":\\\"892px\\\",\\\"style_h\\\":\\\"501px\\\",\\\"inner_w\\\":892,\\\"inner_h\\\":928,\\\"dpr\\\":1}\""
  }
]

4513:// Returns false if mouse is outside the game area (in letterbox)
4517:    // (Skips the letterbox math, whose SDL_GetWindowSize can disagree with the backing on web.)
4528:    float scale_x = (float)window_w / game_width;
4533:    // Calculate letterbox offset
12648:    float scale_x = (float)window_w / game_width;
12994:    float scale_x = (float)window_w / game_width;
13868:    HEAP32[wptr >> 2] = Math.round(g ? g.width  : window.innerWidth);
13948:// size (DPR is 1). Web: window.innerWidth/innerHeight (physical px = these * DPR).
15918:        float scale_x = (float)window_w / game_width;
15923:        // Calculate centered position with letterboxing
15929:        // Clear screen to black (letterbox color)
16419:            float scale_x = (float)window_w / game_width;

15908            // Under web_native we sized the canvas backing store to game_width/height ourselves
15909           // (emscripten_set_canvas_element_size). SDL doesn't know about that — both
15910           // SDL_GetWindowSize and SDL_GL_GetDrawableSize can report the stale CSS size, which
15911           // mis-scales/offsets the blit (content shifts off-screen). The backing IS game_width/
15912           // height, so use those directly: scale 1, offset 0, viewport = the full backing.
15913           if (web_native_resolution) { window_w = game_width; window_h = game_height; }
15914           #endif
15915   
15916           // Calculate scale to fit window while maintaining aspect ratio
15917           // Calculate scale to fit window while maintaining aspect ratio
15918           float scale_x = (float)window_w / game_width;
15919           float scale_y = (float)window_h / game_height;
15920           float scale = (scale_x < scale_y) ? scale_x : scale_y;
15921           if (scale < 1.0f) scale = 1.0f;
15922   
15923           // Calculate centered position with letterboxing
15924           int scaled_w = (int)(game_width * scale);
15925           int scaled_h = (int)(game_height * scale);
15926           int offset_x = (window_w - scaled_w) / 2;
15927           int offset_y = (window_h - scaled_h) / 2;
15928   
15929           // Clear screen to black (letterbox color)
15930           glViewport(0, 0, window_w, window_h);
15931           glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
15932           glClear(GL_COLOR_BUFFER_BIT);
15933   
15934           // Set viewport for game area
15935           glViewport(offset_x, offset_y, scaled_w, scaled_h);
15936           glUseProgram(screen_shader);
15937   
... [15 more lines]

106-static bool vsync_enabled = true;
107-static bool start_fullscreen = false;
108-static bool window_resizable = true;
109:static bool web_native_resolution = false;  // web: render at the browser canvas's pixel size (1:1), NOT a fixed game_width/height scaled to fit (that downscale blurs text)
110-// When true, render every main-loop iteration (vsync paces the rate). When
111-// false (default), cap render at RENDER_RATE — preserves pixel-art motion
112-// integrity on high-refresh-rate monitors. See scripts/monitor_sim.c for the
113-// frame-timing study this default came from.
114-static bool render_uncapped = false;
115-// Index of the monitor the window opens on (0 = primary). Set via
--
4515-    // Web native resolution renders 1:1 into the canvas backing store, and Emscripten already
4516-    // scales mouse coordinates to that backing store — so window coords ARE game coords here.
4517-    // (Skips the letterbox math, whose SDL_GetWindowSize can disagree with the backing on web.)
4518:    if (web_native_resolution) {
4519-        *game_x = (float)win_x;
4520-        *game_y = (float)win_y;
4521-        return (win_x >= 0 && win_x < game_width && win_y >= 0 && win_y < game_height);
4522-    }
4523-
4524-    int window_w, window_h;
--
13196-    return 0;
13197-}
13198-
13199:static int l_engine_set_web_native_resolution(lua_State* L) {
13200-    if (engine_initialized) {
13201:        return luaL_error(L, "engine_set_web_native_resolution must be called before engine_init");
13202-    }
13203:    web_native_resolution = lua_toboolean(L, 1);
... [42 more lines]

4524     int window_w, window_h;
4525        SDL_GetWindowSize(window, &window_w, &window_h);
4526    
4527        // Calculate scale (same logic as render)
4528        float scale_x = (float)window_w / game_width;
4529        float scale_y = (float)window_h / game_height;
4530        float scale = (scale_x < scale_y) ? scale_x : scale_y;
4531        if (scale < 1.0f) scale = 1.0f;
4532    
4533        // Calculate letterbox offset
4534        int scaled_w = (int)(game_width * scale);
4535        int scaled_h = (int)(game_height * scale);
4536        int offset_x = (window_w - scaled_w) / 2;
4537        int offset_y = (window_h - scaled_h) / 2;
4538    
4539        // Convert to game coordinates
4540        float gx = (float)(win_x - offset_x) / scale;
4541        float gy = (float)(win_y - offset_y) / scale;

12644    static int l_mouse_delta(lua_State* L) {
12645       // Delta is in window pixels, scale to game pixels
12646       int window_w, window_h;
12647       SDL_GetWindowSize(window, &window_w, &window_h);
12648       float scale_x = (float)window_w / game_width;
12649       float scale_y = (float)window_h / game_height;
12650       float scale = (scale_x < scale_y) ? scale_x : scale_y;
12651       if (scale < 1.0f) scale = 1.0f;
12652   
12653       lua_pushnumber(L, (float)mouse_dx / scale);
12654       lua_pushnumber(L, (float)mouse_dy / scale);
12655       return 2;

12988        return 2;
12989   }
12990   
12991   static int l_engine_get_scale(lua_State* L) {
12992       int window_w, window_h;
12993       SDL_GetWindowSize(window, &window_w, &window_h);
12994       float scale_x = (float)window_w / game_width;
12995       float scale_y = (float)window_h / game_height;
12996       float scale = (scale_x < scale_y) ? scale_x : scale_y;
12997       if (scale < 1.0f) scale = 1.0f;
12998       lua_pushnumber(L, scale);
12999       return 1;
13000   }
13001   

16413    
16414               // Screen pass: normal compositing to window for visual feedback
16415               glBindFramebuffer(GL_FRAMEBUFFER, 0);
16416               int window_w, window_h;
16417               SDL_GetWindowSize(window, &window_w, &window_h);
16418   
16419               float scale_x = (float)window_w / game_width;
16420               float scale_y = (float)window_h / game_height;
16421               float scale = (scale_x < scale_y) ? scale_x : scale_y;
16422               if (scale < 1.0f) scale = 1.0f;
16423   
16424               int scaled_w = (int)(game_width * scale);
16425               int scaled_h = (int)(game_height * scale);
16426               int offset_x = (window_w - scaled_w) / 2;

All four scale sites (plus the main composite) carry the same clamp. Applying the web-only fix — fit-down instead of crop when the viewport is narrower than the game:

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated. All occurrences were successfully replaced. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\engine\src\anchor.c has been updated successfully. (file state is current in your context — no need to Read it back)

Rebuilding both targets (desktop to verify compilation, web for the actual fix), then re-testing:

Build successful: build/anchor.exe

[setup_ffmpeg] DLLs already present in build\

drwxr-xr-x 1 adn 197121       0 Jul  7 20:29 .
drwxr-xr-x 1 adn 197121       0 Jul  7 20:29 ..
-rw-r--r-- 1 adn 197121  243232 Jul  7 20:30 anchor.js
-rw-r--r-- 1 adn 197121 2470213 Jul  7 20:30 anchor.wasm

Next: package a game with scripts/package-web-game.sh

[
  {
    "type": "text",
    "text": "undefined"
  }
]

[
  {
    "type": "text",
    "text": "Successfully clicked: #canvas"
  }
]

preview_screenshot timed out after 30s. The preview window may be stuck (modal dialog, navigation hang, or unresponsive renderer). Check preview_console_logs for errors.

[
  {
    "type": "text",
    "text": "No console logs."
  }
]

preview_screenshot timed out after 30s. The preview window may be stuck (modal dialog, navigation hang, or unresponsive renderer). Check preview_console_logs for errors.

[
  {
    "type": "text",
    "text": "[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n\n(Showing last 15 of 312 entries. Use 'lines' parameter (max 200) to see more.)"
  }
]

[
  {
    "type": "text",
    "text": "\"alive: 892x501\""
  }
]

preview_screenshot timed out after 30s. The preview window may be stuck (modal dialog, navigation hang, or unresponsive renderer). Check preview_console_logs for errors.

[
  {
    "type": "text",
    "text": "Server 8a612336-01c2-4755-9704-9b560c76b233 stopped"
  }
]

[
  {
    "type": "text",
    "text": "{\n  \"serverId\": \"84ca33ed-f8a5-45e6-9277-400c337831fe\",\n  \"port\": 8321,\n  \"name\": \"anchor3-web-playground\",\n  \"reused\": false,\n  \"previewId\": \"84ca33ed-f8a5-45e6-9277-400c337831fe\",\n  \"tabId\": \"seed\"\n}\nServer started successfully on port 8321."
  }
]

[
  {
    "type": "text",
    "text": "Successfully clicked: #canvas"
  }
]

preview_screenshot timed out after 30s. The preview window may be stuck (modal dialog, navigation hang, or unresponsive renderer). Check preview_console_logs for errors.

[
  {
    "type": "text",
    "text": "[log] Created layer: scene__3d (smooth)\n[log] Created layer: scene__3d (smooth)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n\n(Showing last 10 of 34 entries. Use 'lines' parameter (max 200) to see more.)"
  }
]

[
  {
    "type": "text",
    "text": "\"{\\\"canvas\\\":\\\"0x0\\\",\\\"probe\\\":true,\\\"frames\\\":0}\""
  }
]

[
  {
    "type": "text",
    "text": "\"{\\\"inner\\\":\\\"1280x720\\\",\\\"style\\\":\\\"0px,0px\\\",\\\"attr\\\":\\\"0x0\\\",\\\"hidden\\\":true,\\\"hasFocus\\\":true}\""
  }
]

[
  {
    "type": "text",
    "text": "\"{\\\"style\\\":\\\"1280px,720px\\\",\\\"attr\\\":\\\"1280x720\\\"}\""
  }
]

[
  {
    "type": "text",
    "text": "Viewport set to 800x600."
  }
]

preview_screenshot timed out after 30s. The preview window may be stuck (modal dialog, navigation hang, or unresponsive renderer). Check preview_console_logs for errors.

[
  {
    "type": "text",
    "text": "\"{\\\"hidden\\\":true,\\\"frames\\\":0,\\\"inner\\\":\\\"800x600\\\"}\""
  }
]

The file E:\a327ex\Anchor3\scripts\package-web-game.sh has been updated successfully. (file state is current in your context — no need to Read it back)

-rw-r--r-- 1 adn 197121    7521 Jul  7 20:24 playground.js

Engine URL:    .
Game size:     960 x 540 (auto)

[
  {
    "type": "text",
    "text": "Server 84ca33ed-f8a5-45e6-9277-400c337831fe stopped"
  }
]

[
  {
    "type": "text",
    "text": "{\n  \"serverId\": \"66578ca3-f9d8-4be4-87d3-e48bd6ba5b0b\",\n  \"port\": 8321,\n  \"name\": \"anchor3-web-playground\",\n  \"reused\": false,\n  \"previewId\": \"66578ca3-f9d8-4be4-87d3-e48bd6ba5b0b\",\n  \"tabId\": \"seed\"\n}\nServer started successfully on port 8321."
  }
]

[
  {
    "type": "text",
    "text": "\"{\\\"style\\\":\\\"\\\",\\\"attr\\\":\\\"1920x1080\\\",\\\"hidden\\\":true,\\\"inner\\\":\\\"0x0\\\"}\""
  }
]

[
  {
    "type": "text",
    "text": "[log] Layer3 GL resources initialized (6 meshes)\n[log] Layer3 GL resources initialized (6 meshes)\n[log] Created layer: ui (smooth)\n[log] Created layer: ui (smooth)\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Initialization complete. Press ESC to exit, F11 for fullscreen.\n[log] Display refresh rate: 60Hz (display 0)\n[log] Display refresh rate: 60Hz (display 0)\n\n(Showing last 8 of 34 entries. Use 'lines' parameter (max 200) to see more.)"
  }
]

[
  {
    "type": "text",
    "text": "Server 66578ca3-f9d8-4be4-87d3-e48bd6ba5b0b stopped"
  }
]

Updated task #10 status

The file E:\a327ex\Anchor3\reference\plan.md has been updated successfully. (file state is current in your context — no need to Read it back)

The file E:\a327ex\Anchor3\.claude\CLAUDE.md has been updated successfully. (file state is current in your context — no need to Read it back)

warning: in the working copy of '.claude/CLAUDE.md', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'docs/3D_API.md', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'framework/anchor/collider3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/anchor/collider3.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'playground/main.lua', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'reference/plan.md', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/build-web-engine.sh', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/build-web-engine/anchor.js', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/build-web-games/playground/anchor.js', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'engine/build-web-games/playground/index.html', LF will be replaced by CRLF the next time Git touches it
warning: in the working copy of 'scripts/package-web-game.sh', LF will be replaced by CRLF the next time Git touches it
M  .claude/CLAUDE.md
M  docs/3D_API.md
A  engine/build-web-engine.sh
A  engine/build-web-engine/anchor.js
A  engine/build-web-engine/anchor.wasm
A  engine/build-web-games/playground/anchor.js
A  engine/build-web-games/playground/anchor.wasm
A  engine/build-web-games/playground/index.html
A  engine/build-web-games/playground/playground.data
A  engine/build-web-games/playground/playground.js
M  engine/src/anchor.c
M  framework/anchor/collider3.lua
M  playground/anchor/collider3.lua
M  playground/main.lua
M  reference/plan.md
A  scripts/package-web-game.sh
5f01fe0 Grab joint + camera cannon; web build (Box3D under emcc, sub-1 scale fix, hardened shell)

Anchor3 work committed. Now ending the session publicly:

Updated task #11 status

Launching skill: end-session

# End Session Workflow

This skill is invoked from the **same conversation** where the work was done. You already have the full session context in memory — you do NOT need to read the transcript.

## Sealed Modes (NDA & Private sessions)

> ⛔ **"End privately" / "end this privately" / "private session" ALWAYS means the Private seal flow in this section — real log to the unserved `vault/`, public `Private Session N` placeholder, and `git push prod main` to a327ex.com. It NEVER means saving to a local `private/` folder (e.g. `E:/a327ex/private/`) or any local-only "no git / no website / no push" variant.** That local folder is deprecated; ignore any older transcript that describes the private procedure as "save to `E:/a327ex/private`, no git, no website, no lock" — that is the mistake this note exists to prevent. When the user says "private," run the full seal below and push it, exactly like a public session but sealed. Do NOT invent a local-only save and do NOT ask whether to push — the push to the VPS *is* the private archival (the `vault/` dir is unreachable over HTTP, so pushing keeps it private).

Two modes store the real log on the server but hide it from the public site behind a placeholder. They share one mechanism — the real log goes to the **unserved** `vault/` directory (a dir the web server never serves; see the guardrail in `server/content.lua`), and the public site shows only a placeholder log in `logs/`. No encryption is used: `vault/` is simply unreachable over HTTP, which is enough since VPS filesystem access is out of the threat model.

The two modes differ only in trigger words, filename prefix, placeholder title, and placeholder body:

| Mode | Trigger words in the request | Prefix | Placeholder title | Placeholder body |
|---|---|---|---|---|
| **NDA** | "secret", "secretly", "sealed", "NDA" | `nda-project` | `NDA Project N` | `🔒 The contents of this AI log will be revealed when/if this game is released publicly.` |
| **Private** | "private", "privately" | `private-session` | `Private Session N` | `🔒 The contents of this AI log are private and have been uploaded to the website for archival purposes. They may or may not be revealed in the future.` |

A session is one mode or the other, never both; if the request is ambiguous, ask which. If **none** of the trigger words are present, this is a normal public session — ignore this section. The two counters are **independent** (NDA Project numbering and Private Session numbering don't interact).

**Multiple NDA projects (grouping).** Several NDA games can be sealed at the same time. The project a log belongs to is just the **first word of its real title** (e.g. *Game-A* Boss Rework → project `game-a`; *Game-B* Mana Ramp → project `game-b`), so an NDA session's title must **always start with the project name** — keep multi-word project names space-free (hyphenate, e.g. `Game-A`). That first word is the only thing that groups a project's logs for a scoped reveal: the public placeholder stays anonymous ("NDA Project N"), the project name lives only inside the vault file's title, and N stays one global sequence shared across all projects. Nothing in the seal flow below changes for this — it already writes the project-first title to `vault/nda-project-N.md`; the grouping is read back out at unseal time.

Run the normal steps below with these overrides. Throughout, let `PREFIX` and `LABEL` be the active mode's row — e.g. Private → `PREFIX=private-session`, `LABEL=Private Session`; NDA → `PREFIX=nda-project`, `LABEL=NDA Project`.

**A. Title.** The real title is what the user named the session (e.g. the text after "name it …"); if they gave none, ask. Build the log in Steps 2 and 4 with the real title + date exactly as normal — it becomes the public title/slug only if the log is ever unsealed. **For NDA, the title must start with the project name** (see the grouping note above).

**B. Step 4 override — write two files instead of one.** Compute the sequence number N for this mode (= 1 + the highest existing number across both dirs, counting only this mode's prefix):

```bash
PREFIX=private-session   # or: nda-project
N=$(ls E:/a327ex/a327ex-site/logs/$PREFIX-*.md \
       E:/a327ex/a327ex-site/vault/$PREFIX-*.md 2>/dev/null \
     | grep -oE "$PREFIX-[0-9]+" | grep -oE '[0-9]+' | sort -n | tail -1)
N=$(( ${N:-0} + 1 )); echo "$LABEL $N"
```

Build the real log into `/tmp/session-log.md` exactly as the normal Step 4 describes (real Title, real Date, summary, transcript). Then, **instead of** `cp`-ing it to `logs/[slug].md`:

```bash
mkdir -p E:/a327ex/a327ex-site/vault
cp /tmp/session-log.md "E:/a327ex/a327ex-site/vault/$PREFIX-$N.md"   # real log → unserved vault
```

And write the public placeholder to `E:/a327ex/a327ex-site/logs/<PREFIX>-<N>.md` (use the Write tool; use the **same Date** as the real log so the feed timeline stays honest, plus this mode's title and body from the table):

```markdown
Title: <LABEL> N
Date: <same date as the real log>

# <LABEL> N

<this mode's placeholder body>
```

Step 4.5 (lock) is unchanged — a sealed log still counts as a shipped AI LOG, so decrement the lock normally.

**C. Step 5/6 override — the project (GitHub) repo. This is the one place the two modes differ from each other:**

- **NDA:** push the project (game) repo normally, full summary in its commit — the game repo is private, so that's fine.
- **Private:** **do NOT push the project repo by default.** A private session may target a *public* repo (e.g. Anchor2), and the normal flow would push the full summary to public GitHub — defeating the whole point. Only do the a327ex-site half below. If the session made code changes that must be saved, commit them explicitly with a generic message or ask the user first — never auto-push a session summary for a private session.

**D. Step 6 override — a327ex-site commit.** Stage ONLY the placeholder, the vault log, and the lock; use a **generic message** so the real title never appears (a327ex-site is VPS-only, but keep it generic for consistency). **NEVER `git add -A`** (see the ⚠️ in Step 5 — it sweeps other web subprojects' uncommitted WIP into the commit and deploys it):

```bash
cd E:/a327ex/a327ex-site
git add "logs/$PREFIX-$N.md" "vault/$PREFIX-$N.md" .lock.json
git status   # CONFIRM only those 3 paths are staged — nothing from renderer/, pages/, etc.
git commit -m "Add $LABEL $N"
git push prod main 2>&1 | tail -3
```

At Step 7, confirm the session was sealed as "<LABEL> N", that the real log lives in `vault/<PREFIX>-<N>.md`, and that `/unseal` can reveal it later.

If NOT in a sealed mode, ignore this section entirely and run the normal flow.

## Step 1: Get Session Info

Ask the user for the **session title** (max 30 characters). Examples: "Anchor Phase 10 Part 5", "Physics Arena Setup", "Timer System Fix", "Thalien Lune Design".

**Determine the project yourself from your session context** — you know which repo(s) were worked on, which files were created/modified, and where they live. No need to ask. See Step 5 for the list of known project roots; if the session touched something outside the list, infer the root from the paths you actually edited.

## Step 2: Write Summary

Write the summary from your conversation memory. You have the full session context — no need to read any files.

The summary should be **thorough and detailed**. Each major topic deserves its own section with multiple specific bullet points. Don't compress — expand.

**Purpose:** These summaries serve as searchable records. Future Claude instances will grep through past logs to find how specific topics were handled. The more detail you include, the more useful the summary becomes for finding relevant context later.

Format (this is just an example structure — adapt sections to match what actually happened):

```markdown
# [Title]

## Summary

[1-2 sentence overview of the session's main focus]

**[Topic 1 - e.g., "Spring Module Implementation"]:**
- First specific detail about what was done
- Second detail - include file names, function names
- User correction or feedback (quote if notable)
- Technical decisions and why

**[Topic 2 - e.g., "Camera Research"]:**
- What was researched
- Key findings
- How it influenced implementation

**[Topic 3 - e.g., "Errors and Fixes"]:**
- Specific error message encountered
- Root cause identified
- How it was fixed

[Continue for each major topic...]

---

[Rest of transcript follows]
```

Rules:

- **Be thorough** — If in doubt, include more detail, not less. Each topic should be as detailed as possible while still being a summary.
- **Think searchability** — Future instances will search these logs. Include keywords, function names, error messages that someone might grep for.
- **One section per major topic** — Don't combine unrelated work into one section
- **Chronological order** — Sections should match conversation flow
- **Specific details** — Error messages, file names, function names, parameter values
- **Include user quotes** — When user gave notable feedback, quote it (e.g., "k/d variables are not intuitive at all")
- **Weight planning equally** — Research, proposals, alternatives considered, user feedback on approach are as important as implementation
- **Weight problems solved** — Errors, root causes, fixes, user corrections all matter
- **Technical specifics** — Include formulas, API signatures, parameter changes when relevant

## Step 3: Proceed Without Approval

Do NOT show the summary to the user for approval. Write it directly. The user can review the committed log after the fact and request a follow-up edit if anything is off.

## Step 4: Convert Transcript and Write the Log File

```bash
# Find recent sessions (Claude + Cursor + Codex). Same script lives in Anchor2:
python E:/a327ex/Anchor2/scripts/find-recent-session.py --limit 5
# or: python E:/a327ex/Anchor/scripts/find-recent-session.py --limit 5
```

The script shows sessions sorted by when they ended. The **first result** is the current conversation (since end-session was invoked here). Use it.

Use a lowercase hyphenated slug derived from the title (e.g., "anchor-primitives-hitstop-animation").

Get the end timestamp for the Date frontmatter — this is the wall-clock time when end-session was invoked, NOT the time the JSONL started. Sessions often span multiple days, and the log should be filed under the day the work was wrapped up:

```bash
date "+%Y-%m-%d %H:%M:%S"
```

Use this output verbatim. Do not substitute the JSONL start timestamp; the log appears in the sidebar sorted by Date, and a multi-day session with a Date pinned to day 1 will sort below sessions that ended later but started later, hiding the most recent work.

Convert the transcript to markdown:

```bash
python E:/a327ex/Anchor2/scripts/jsonl-to-markdown.py [SESSION_PATH] /tmp/session-log.md
# or: python E:/a327ex/Anchor/scripts/jsonl-to-markdown.py ...
```

The same script **auto-detects** Claude Code JSONL vs Cursor/Composer agent JSONL (`~/.cursor/projects/.../agent-transcripts/...`) vs Codex rollouts (`~/.codex/sessions/...`). For Composer sessions, use `find-recent-session.py` (it merges all sources) and pick the `[cursor]` line for the current chat.

Replace the default header (`# Session YYYY-MM-DD...`) at the top of `/tmp/session-log.md` with the approved title and summary, AND prepend frontmatter. The final file shape:

```markdown
Title: [Title]
Date: YYYY-MM-DD HH:MM:SS

# [Title]

## Summary

[approved summary text from step 2]

---

[transcript content from jsonl-to-markdown script]
```

**Frontmatter is non-negotiable.** Every log file MUST start with `Title:` and `Date:` lines. Without them, the site's sidebar shows the slug as the title and 0 (epoch) as the sort date. The backfill script in `a327ex-site/deploy/backfill_metadata.py` is a safety net, not a substitute — write it correctly the first time.

Then copy the final file to the log destination:

```bash
cp /tmp/session-log.md E:/a327ex/a327ex-site/logs/[slug].md
```

**Sealed mode (NDA or Private):** do NOT write to `logs/[slug].md`. Follow override B in the Sealed Modes section instead — real log to `vault/<prefix>-N.md`, placeholder to `logs/<prefix>-N.md`.

## Step 4.5: Decrement the lock (if active)

Read `E:/a327ex/a327ex-site/.lock.json` if it exists. If it contains `{"remaining": N}` with N > 0:

- Decrement N by 1
- Write `{"remaining": N-1}` back to the file
- If N becomes 0, the lock is cleared. You may leave the file at `{"remaining": 0}` or delete it; both work.

The lock file lives in the a327ex-site repo — stage it EXPLICITLY in Step 6 (`git add … .lock.json`). Do NOT rely on `git add -A` (this skill no longer uses it — see the ⚠️ in Step 5).

If no lock file exists or `remaining` is already 0, do nothing. (See the `/lock` skill for the lock's full design.)

## Step 5: Commit Project Repo

Identify the project repo(s) worked on this session from your own context — you already know which repos were touched and which files changed. For the common projects:

| Project | Root | Stage command |
|---|---|---|
| Anchor | `E:/a327ex/Anchor` | `git add docs/ framework/ engine/ scripts/ reference/` |
| Anchor2 | `E:/a327ex/Anchor2` | `git add framework/ engine/ arena/ reference/ scripts/ docs/ .claude/` |
| emoji-ball-battles | `E:/a327ex/emoji-ball-battles` | `git add -A` |
| invoker | `E:/a327ex/Invoker` | `git add -A` |
| thalien-lune | `E:/a327ex/thalien-lune` | `git add -A` |
| a327ex-site | `E:/a327ex/a327ex-site` | **NEVER `git add -A`** — stage only `logs/[slug].md .lock.json`. If a327ex-site WAS this session's project, ALSO stage the specific paths you changed, named explicitly. See ⚠️ below. |

For a project not listed, infer the root from the files you actually created or modified this session and stage those. If multiple candidate roots look valid, ask the user which files to stage.

`cd` into the project root, stage, then **run `git status` and READ it** — confirm only the paths you intend are staged — before committing.

> ⚠️ **a327ex-site: never `git add -A`.** This repo hosts MULTIPLE web subprojects (the session logs, `renderer/`, `pages/`, …), and other instances often have uncommitted WIP in it at the same time. `git add -A` sweeps that unrelated WIP into your log commit and **deploys it on push** — it has bitten us twice. Stage the log + `.lock.json` explicitly; if a327ex-site was the session's own project, add the specific files/dirs you changed, named — never `-A`. (Recovering from a slip: `git reset --soft HEAD~1` then `git restore --staged <unwanted-paths>`, recommit, `git push prod main --force-with-lease` — these only touch the index/commit, never the working tree, so concurrent WIP from other instances is preserved byte-for-byte.)

**IMPORTANT — FULL SUMMARY IN COMMIT:** The commit message MUST include the FULL summary from the log file. Read the summary back from the log file to ensure nothing is missing.

**IMPORTANT — COMMIT METHOD:** The summary contains backticks, special characters, and markdown that WILL break heredocs and `git commit -m`. ALWAYS use the file-based method below. NEVER try a heredoc first — it will fail and produce a malformed commit that needs amending.

```bash
# Skip until we hit the line "## Summary", then take everything after the next
# blank line until the --- separator that precedes the transcript.
awk '/^## Summary$/{found=1; next} found && NR>1 && /^---$/{exit} found' \
    E:/a327ex/a327ex-site/logs/[slug].md > /tmp/commit_msg.txt

# Prepend the title (plain text, no #) and append attribution
sed -i "1i [Title]\n" /tmp/commit_msg.txt
printf "\nGenerated with [Claude Code](https://claude.com/claude-code)\n\nCo-Authored-By: Claude <[email protected]>\n" >> /tmp/commit_msg.txt

git commit -F /tmp/commit_msg.txt
```

## Step 6: Push the Repos

Two pushes — project (to GitHub) and a327ex-site (to the VPS):

```bash
# Project repo to GitHub. Skip this push if the project IS a327ex-site
# (handled by the second push below — don't duplicate).
git push origin main

# a327ex-site to the VPS (post-receive hook restarts the Lua server).
# NEVER `git add -A` here (see the ⚠️ in Step 5). Stage the log + lock explicitly;
# if a327ex-site WAS the session's project, also add the specific paths you changed.
cd E:/a327ex/a327ex-site
git add logs/[slug].md .lock.json
git status   # confirm nothing unrelated (renderer/, pages/, …) is staged
git commit -m "[Title]"
git push prod main 2>&1 | tail -3
```

**Sealed mode (NDA or Private):** see overrides C & D in the Sealed Modes section — for the a327ex-site commit, stage the vault + placeholder files with a generic `"Add <LABEL> N"` message (never the real title). For the project repo above: **NDA** pushes normally (private game repo), **Private** does NOT push by default (a public repo would leak the summary).

**Failure handling:** if either push fails, the other still happens. Local commits stay intact, so the user can re-push manually once they've fixed whatever blocked it. Don't roll back; the committed state on disk is the source of truth.

## Step 6.5: Sync the renderer (engine site)

The a327ex-site push updated the **Lua server**. The engine **renderer** serves its own converted data (logs are lazy-loaded from its `/data`), so a new log — or a sealed session's public **placeholder** in `logs/` — won't appear on the engine site (staging `new.a327ex.com` now, `a327ex.com` after cutover) until the renderer is synced. Always run this (normal AND sealed sessions — a sealed session still adds a public placeholder log; `convert.lua` converts `logs/`, never `vault/`):

```bash
bash E:/a327ex/a327ex-site/renderer/tools/deploy.sh --content 2>&1 | tail -12
```

Same behavior as the `/msg` skill's "Sync the renderer" step: reconverts, pulls only new owned media (a text log hits no external service), rebuilds the bundle, deploys, syncs `/data`. **Non-aborting** + idempotent. Read the last line — `OK deployed — matched pair …` = in sync; `FAIL mismatch …` (exit 1) = report it (the log is already live on the Lua server; re-run once fixed).

## Step 7: Confirm

Tell the user:

- Project commit hash + GitHub push result
- a327ex-site commit hash + VPS push result

Format:

```
Logged — "[Title]".
  project (Anchor2):  abc1234  pushed to GitHub
  a327ex-site:        ghi9012  pushed to a327ex.com (post-receive deployed)
  renderer:           synced (deploy.sh --content OK)
```

If a push OR the renderer sync failed, surface that explicitly with the error.

## Notes

- **Frontmatter is non-negotiable.** Every log file MUST have `Title:` and `Date:` at the top. Enforced at write time in step 4. The backfill script is a safety net, not a substitute.
- **If the project IS `a327ex-site`** (e.g., you spent the session writing the renderer or fixing the theme), there's no separate "project repo to GitHub" push — the a327ex-site push at the end IS the project push. Don't duplicate.
- **Legacy note**: this skill used to also dual-write to `anchor.blot.im/logs/` and `anchor.blot.im/context/`. Post-cutover (May 2026), `anchor.blot.im` is a JS redirect to `a327ex.com` and no longer receives content. Drop those steps if you find any older docs that still reference them.


ARGUMENTS: Title: Fable Test — Anchor 3D (public session, not private/secret)

Running the public end-session flow for "Fable Test — Anchor 3D" (slug: fable-test-anchor-3d, project: Anchor3).

2026-07-07T23:38:36.872Z 1248d5a7-d186-47d1-8aca-ed6809b6e803 [claude] <-- MOST RECENT

   C:\Users\adn\.claude\projects\E--a327ex\1248d5a7-d186-47d1-8aca-ed6809b6e803.jsonl



2026-07-07T23:16:38.783Z b466f190-f23f-479c-9b8f-a811de0a1c64 [claude]

   C:\Users\adn\.claude\projects\E--a327ex\b466f190-f23f-479c-9b8f-a811de0a1c64.jsonl



2026-07-07T22:49:47.866Z 689cefaa-c928-4524-85fc-f8dfbde9fd7f [claude]

   C:\Users\adn\.claude\projects\E--a327ex\689cefaa-c928-4524-85fc-f8dfbde9fd7f.jsonl



2026-07-07 20:38:41

Written to C:/Users/adn/AppData/Local/Temp/session-log.md

# Session 2026-07-07 16:46



---



> Hi Fable, another test for you. Recently Box3D was released and it seems most people think it's high quality. I'd like to see how feasible it would be to expand Anchor 2 into Anchor 3 by making it support 3D games. I know this is likely a huge task, but given that we have physics already with a similar interface, as Box3D matches Box2D where it matters, it probably made the job a lot easier. I'd like your initial assessment of the task and its scope.

5658 /tmp/session-log.md

Transcript converted. Now building the final log with frontmatter and the full summary:

File created successfully at: C:\Users\adn\AppData\Local\Temp\session-log-header.md (file state is current in your context — no need to Read it back)

Title: Fable Test — Anchor 3D
Date: 2026-07-07 20:38:41

# Fable Test — Anchor 3D

## Summary

Capability-test session: assess whether Anchor 2 could be extended into "Anchor 3" with 3D game support on top of the newly released Box3D physics engine — then actually build it, fix it live, add interaction features, and ship the result as a playable web build. The session produced a complete siloed 3D engine extension at `E:/a327ex/Anchor3/` (own git repo) with a physics playground toy verified on desktop and in the browser.

**Box3D feasibility assessment:**

- Box3D facts established via web research: released 2026-06-30 by Erin Catto, MIT, C17, CMake; shapes = spheres/capsules/convex hulls/triangle meshes/height fields; joints = revolute/prismatic/distance/motor/weld/wheel; contact/sensor/hit events; ray/shape casts and overlap queries; cross-platform determinism, SIMD (SSE2/Neon), Emscripten support; alpha status with character movement + ghost-collision mitigation explicitly listed as future work.
- Grounded the assessment in `anchor.c` (~13.5k lines): the 2D renderer is hardwired at every level (`VERTEX_FLOATS 32` with vec2 positions, `gl_Position = projection * vec4(aPos, 0.0, 1.0)` — z literally 0, 2×3 affine transforms, orthographic only, painter's-algorithm layers, no depth testing, SDF übershader). Physics bindings (76 `l_physics_*` functions) map ~1:1 to Box3D.
-rw-r--r-- 1 adn 197121 324199 Jul  7 20:39 E:/a327ex/a327ex-site/logs/fable-test-anchor-3d.md
{"remaining": 0}
Shell cwd was reset to E:\a327ex

Log staged (324 KB), lock already at 0 — nothing to decrement. Now the project commit: Anchor3 has no remote (local-only repo), and this session's work is already committed — I'll amend that unpushed commit to carry the full summary per the skill:

bdaa5a2 Fable Test — Anchor 3D

warning: in the working copy of 'logs/fable-test-anchor-3d.md', CRLF will be replaced by LF the next time Git touches it
## main...prod/main
A  logs/fable-test-anchor-3d.md

Only the log is staged (lock unchanged). Committing and pushing to the VPS:

97daabe Fable Test — Anchor 3D
remote: [post-receive] deployed at 2026-07-07T23:40:17Z        
To ssh://a327ex/srv/a327ex.git
   9ccc2cf..97daabe  main -> main

Note: assets/YuGoth{R,M}.ttc are now superseded by the .ttf subsets � remove them so

build-web.sh doesn't bundle the full 28 MB. theme.lua references the .ttf names.

== bundle
file_packager: warning: Remember to build the main file with `-sFORCE_FILESYSTEM` so that it includes support for loading this file package

   renderer.data 60ae4e85be96  (13015484 B)
== R2
   R2 sync ok
== deploy bundle + engine-boot.js
   hashed: renderer-60ae4e85be.data  anchor-c81fbffba0.wasm
== sync lazy /data (content-changed pages only)
   synced 2 changed page(s)
OK deployed — matched pair on VPS (60ae4e85be96b3c4d768b06130adb771 a19073ae0b5155298cbce15987cecd8c )

Session logged. Marking done and moving to the final phase — publishing the playable build:

Updated task #11 status

Updated task #12 status

console
deploy
drafts
logs
media
messages
notes
pages
posts
README.md
renderer
server
static
stories
vault
8:# on HTML + the rate-limited /api/ location, so a long-term revert isn't a downgrade.
66:    location /media/ {
76:    location /static/ {
88:    location /api/ {
103:    location / {

    # Behind Cloudflare: rewrite $remote_addr from CF-Connecting-IP so logs, the
    # forwarded X-Real-IP, and any rate-limiting see the true visitor, not a CF edge.
    include /etc/nginx/snippets/cloudflare-realip.conf;

    # Static media served directly by nginx (skip the Lua server entirely).
    # All per-post images, videos, and shared assets live under /media/.
    location /media/ {
        alias /srv/a327ex/work/media/;
        access_log off;
        expires 7d;
        add_header Cache-Control "public, immutable" always;
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    # Static stylesheets / scripts (per-theme assets like old-blog.css).
    location /static/ {
        alias /srv/a327ex/work/static/;
        access_log off;
        expires 1d;
        add_header Cache-Control "public, must-revalidate" always;
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    # JSON API (identity + analytics + chat) → Lua server. Tight body cap + per-IP rate
    # limit, mirroring the engine conf — the Lua server routes /api/ itself, so the API
    # keeps working on a revert, now without losing its edge protections.
    location /api/ {
        limit_req zone=api burst=20 nodelay;
... [26 more lines]

a327ex.service
a327ex-backup.service
a327ex-backup.timer
backfill_metadata.py
backup.sh
build_llms_package.py
cloudflare-realip.conf
CONTENT_SYNTAX.md
convert_syntax.py
migrate_links.py
migrate_media.py
nginx-a327ex.conf
nginx-a327ex-engine.conf
nginx-logformat.conf
nginx-new-a327ex.conf
visitor-stats.sh

25:# toggle: comment the ENGINE OVERLAY directives in `location /` to revert instantly
95:    location ~ ^/(anchor\.js|anchor\.wasm|renderer\.js|renderer\.data|engine-boot\.js)$ {
107:    location ~ ^/(renderer|anchor)-[0-9a-f]+\.(data|wasm)$ {
117:    location /data/ {
127:    location /media-cache/ {
141:    location ~ ^/(llms[a-z\-]*\.txt|a327ex-content\.zip)$ {
152:    location ~ ^/raw/(logs|posts|stories|pages)/([A-Za-z0-9._\-]+\.md)$ {
162:    location /media/ {
172:    location /static/ {
182:    # `location /` so JSON responses skip the sub_filter overlay and get a tight
185:    location /api/ {
201:    location / {
225:        # site (server-rendered HTML only). The engine-serving locations above are inert
226:CSP console spam during the report was tweet-widget iframes + MetaMask noise, NOT our header
971:iframes/widgets (tweet/youtube/video) become native cards.
1068:- **D — Owned media (DECISION 2026-06-16: full in-engine ownership, NOT iframe/card stubs).**
1070:  An alternate "hole-punch" idea (engine leaves a transparent rect, browser shows a real iframe
1127:by the build, then rendered in-engine. No live iframes/widgets. This is forced by (a) the project's
1182:  Same-origin `<video>` is NOT the inert cross-origin-iframe problem — the engine gets the pixels, so
1193:a327ex.com invites label DMCA. Doesn't block desktop work; decide self-host vs web-only-iframe-fallback

    location /media/ {
        alias /srv/a327ex/work/media/;
        access_log off;
        expires 7d;
        add_header Cache-Control "public, immutable" always;
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    # Static stylesheets / scripts (per-theme assets like old-blog.css).
    location /static/ {
        alias /srv/a327ex/work/static/;
        access_log off;
        expires 1d;
        add_header Cache-Control "public, must-revalidate" always;
        add_header X-Content-Type-Options "nosniff" always;
        try_files $uri =404;
    }

    # JSON API (identity + analytics; chat later) → Lua server. Separate from
    # `location /` so JSON responses skip the sub_filter overlay and get a tight

total 2848
drwxr-xr-x 1 adn 197121       0 Jul  7 20:44 .
drwxr-xr-x 1 adn 197121       0 Jul  7 20:44 ..
-rw-r--r-- 1 adn 197121  243232 Jul  7 20:44 anchor.js
-rw-r--r-- 1 adn 197121 2470213 Jul  7 20:44 anchor.wasm
-rw-r--r-- 1 adn 197121    6943 Jul  7 20:44 index.html
-rw-r--r-- 1 adn 197121  179448 Jul  7 20:44 playground.data
-rw-r--r-- 1 adn 197121    7521 Jul  7 20:44 playground.js

One cosmetic fix — the page title says "playground"; making it presentable before it goes live:

<tool_use_error>File has not been read yet. Read it first before writing to it.</tool_use_error>

1    <!DOCTYPE html>
2   <html>
3   <head>
4       <meta charset="utf-8">
5       <meta name="viewport" content="width=device-width, initial-scale=1.0">
6       <title>playground</title>
7       <style>
8           * { margin: 0; padding: 0; box-sizing: border-box; }
9           html, body { width: 100%; height: 100%; background: #000; overflow: hidden; }
10          #canvas {
11              display: block;
12              position: absolute;

The file E:\a327ex\a327ex-site\media\games\anchor3-playground\index.html has been updated successfully. (file state is current in your context — no need to Read it back)

Committing the game files (explicit staging only, per the site repo rule) and deploying:

warning: in the working copy of 'media/games/anchor3-playground/playground.js', CRLF will be replaced by LF the next time Git touches it
A  media/games/anchor3-playground/anchor.js
A  media/games/anchor3-playground/anchor.wasm
A  media/games/anchor3-playground/index.html
A  media/games/anchor3-playground/playground.data
A  media/games/anchor3-playground/playground.js
remote: [post-receive] deployed at 2026-07-07T23:45:17Z        
To ssh://a327ex/srv/a327ex.git
   97daabe..c2fd371  main -> main

Deployed. Verifying the live URL and the wasm content-type:

HTTP/1.1 200 OK

Date: Tue, 07 Jul 2026 23:45:26 GMT

Content-Type: text/html

Connection: keep-alive

Server: cloudflare

Last-Modified: Tue, 07 Jul 2026 23:45:14 GMT

---
HTTP/1.1 200 OK
Content-Type: application/wasm
Content-Length: 2470213
X-Content-Type-Options: nosniff
Report-To: {"group":"cf-nel","max_age":604800,"endpoints":[{"url":"https://a.nel.cloudflare.com/report/v4?s=zYl%2Bd%2FhxLzyXnXOxlX2yvCtMqYO9eFLUVefXnqfsq94cAPgr9BQ1%2FBWah6Rw4snBVgW6KRWhmySGOVJl07k0BjudC2p64MFQNN%2FYVGgjlUObRDwNi280PbsjHB%2FP"}]}

Live and serving correctly — application/wasm mime intact, page 200. Final step, the homepage message:

Launching skill: msg

# /msg — add a message to the a327ex.com feed

Each message lives in **two places** that must stay in sync:

| Location | Convention |
|---|---|
| `E:/a327ex/a327ex-site/pages/home.md` (inline `<article>` in `#messages-source`) | `::TYPE` directives, `/media/messages/<slug>/...` paths |
| `E:/a327ex/a327ex-site/posts/YYYY-MM-DD-HHMMSS.md` (mirror) | same directives + frontmatter incl. `Kind: message` |

If the user later asks to edit a message, update **both** places.

> Note: prior to cutover this skill also dual-wrote to `anchor.blot.im/`. The
> Blot site is now a JS-redirect to `a327ex.com`, so we only target one repo.

## Inputs

The user types `/msg` followed by the message body in plain markdown:

```
/msg I just realized the simplest version of this is also the best version.
```

Multi-paragraph and lists are fine:

```
/msg Two notes on AI workflow:
1. Batch the small questions.
2. Trust the model when the path is obvious.
```

For media, the user provides either a **full URL** (YouTube, Twitter/X) or an **absolute local file path** to a video/image on disk. The skill copies local files into `a327ex-site/media/messages/<slug>/` and rewrites the body to use the right `::TYPE` directive.

## Steps

### 0. Check the lock

Read `E:/a327ex/a327ex-site/.lock.json` if it exists. If it contains `{"remaining": N}` with N > 0, **refuse** and stop:

> "Locked: N AI LOGS remaining before /msg unlocks. Ship session logs (via end-session) to clear."

Do not proceed to step 1. There is no override — the lock is bypassed only by AI LOGS decrementing `remaining` to 0 via the `end-session` skill, or by the user explicitly running `/lock N` to lower the count (but `/lock 0` is disallowed).

If the lock file doesn't exist, contains `{"remaining": 0}`, or is otherwise inactive, proceed normally to step 1.

### 1. Get the timestamp + slug

```bash
date "+%Y-%m-%d %H:%M:%S"
```

Use that full string (HH:MM:SS, 24-hour) for `data-date` and `Date:`. The slug uses the same time without separators: `YYYY-MM-DD-HHMMSS`.

If a mirror file with that slug already exists in `posts/` (extremely unlikely at second precision), append `-2`, `-3`... until unique.

### 2. Verify the repo is ready

- Read `E:/a327ex/a327ex-site/pages/home.md`, confirm it contains `<div id="messages-source">`. If not, abort and tell the user the homepage is malformed.
- If the repo has uncommitted changes from another task, warn the user before proceeding.

### 3. Detect embed type and resolve media

Walk the message body looking for any of:

| Pattern | Embed type |
|---|---|
| `https://www.youtube.com/watch?v=ID`, `https://youtu.be/ID`, `youtube.com/embed/ID` | **youtube** (no media file) |
| `https://twitter.com/USER/status/ID`, `https://x.com/USER/status/ID` | **tweet** (no media file) |
| Absolute local path ending in `.mp4`, `.webm`, `.mov` | **video** (file copied into media/messages/<slug>/) |
| Absolute local path ending in `.png`, `.jpg`, `.jpeg`, `.gif`, `.webp` | **image** (file copied into media/messages/<slug>/) |
| `::game <name>` typed directly by the user | **game** (no new file — pre-deployed under `media/shared/games/<name>/`) |
| anything else (plain URLs, prose) | no embed; treat as text |

A tweet URL recognized as an embed must occupy its own line (or be the whole message). Tweet URLs that appear inline inside a sentence stay as regular links — don't lift them out.

For each non-text embed referencing a local file: check the source path exists on disk. If a referenced video/image file is missing, **stop and ask the user where the file is** — don't silently produce a broken message.

**Drop-zone convention.** The user may drop loose files at `media/<filename>` (top level of the media dir, alongside `media/messages/`, `media/posts/`, etc.) instead of providing an absolute path. If the message body references such a file — by bare filename, by `media/<filename>`, or as a placeholder line containing only the path — treat it as belonging to this message. Move (don't copy) the file into `media/messages/<slug>/<filename>` so the top-level drop zone stays clean for next time, and rewrite the body reference to `::image /media/messages/<slug>/<filename>` (or `::video ...` as appropriate). After moving, verify the original `media/<filename>` is gone — leaving stragglers there pollutes the drop zone.

### 4. Copy media files into the repo

For each video/image embed, copy the file into the per-message folder:

```bash
mkdir -p E:/a327ex/a327ex-site/media/messages/YYYY-MM-DD-HHMMSS
cp "<absolute-source-path>" \
   "E:/a327ex/a327ex-site/media/messages/YYYY-MM-DD-HHMMSS/<basename>"
```

Path the rendered article will reference: `/media/messages/<slug>/<basename>`.

### 5. Generate the body (two forms — they differ!)

The message body lives in two places (the inline `<article>` in `home.md` and the mirror file in `messages/`). Each renders the body through a different pipeline, so the conventions differ:

**`<article>` body in `home.md`** — wrapped in HTML so discount treats it as opaque. Markdown is NOT re-processed inside. Use raw HTML for paragraphs and inline formatting:

| Markdown the user typed | HTML inside the `<article>` |
|---|---|
| paragraph text | `<p>paragraph text</p>` (one `<p>` per blank-line-separated paragraph) |
| `*italic*` / `_italic_` | `<em>italic</em>` |
| `**bold**` / `__bold__` | `<strong>bold</strong>` |
| `[text](url)` | `<a href="url">text</a>` |
| `- item` / `1. item` | `<ul><li>item</li></ul>` / `<ol><li>item</li></ol>` |
| `` `code` `` | `<code>code</code>` |
| `> quote` | `<blockquote><p>quote</p></blockquote>` |
| `---` | `<hr>` |

Escape literal `<`, `>`, `&` in body text as `&lt;`, `&gt;`, `&amp;`.

`::TYPE` directive lines DO still work inside an article — `extensions.lua` line-walks the file before discount, replacing each directive with its HTML expansion regardless of the surrounding context. So mix raw HTML paragraphs with directive lines freely:

```html
<article data-date="..." data-href="...">
<p>Some text setting up the video.</p>

<p>And a closing thought.</p>
</article>
```

**Mirror file body in `posts/<slug>.md`** — plain markdown, no HTML wrapper. Discount renders paragraphs/lists/links/etc. natively, plus the same `::TYPE` directives are pre-processed. Use the user's original markdown verbatim — no HTML conversion needed.

Embed forms (same in both places):

| Embed | Directive |
|---|---|
| YouTube | `::youtube ID` (just the 11-char video ID — no full URL) |
| Tweet | `::tweet <full URL>` (use the URL exactly as posted — twitter.com or x.com both fine) |
| Game | `::game <name>` (e.g. `::game arena`) |
| Video | `::video /media/messages/<slug>/<basename>` |
| Image | `::image /media/messages/<slug>/<basename>` |

If the message is *only* an embed, the body is just the directive line (no surrounding paragraphs / no `<p>` wrapping).

### 6. Prepend inline article to `home.md`

Find `<div id="messages-source">` and insert immediately after it (newest at top), keeping a blank line above and below:

```html
<div id="messages-source">

<article data-date="2026-05-09 11:52:30" data-href="/posts/2026-05-09-115230">

</article>

<!-- older articles below, do not touch -->
```

### 7. Write the mirror file

`E:/a327ex/a327ex-site/posts/YYYY-MM-DD-HHMMSS.md`:

```markdown
Title: <first ~50 chars of message, truncated at a word boundary, or a generic descriptor like "Video"/"Game" for pure-embed messages>
Date: YYYY-MM-DD HH:MM:SS
Kind: message
Link: /posts/YYYY-MM-DD-HHMMSS

[message body, directive form — text in markdown, embeds as ::TYPE]
```

**Frontmatter is non-negotiable.** Every mirror file MUST start with `Title:`, `Date:`, `Kind: message`, and `Link:` (Kind is what marks it as a feed micropost now that messages live in posts/) — the homepage feed JS sorts by `Date`, the sidebar reads `Title`, and `Link` matches `data-href` on the inline article. Without them the entry shows up with the slug as title and at the bottom of the feed.

### 8. Commit and push

```bash
cd E:/a327ex/a327ex-site

# Stage the article + mirror; the media/messages/<slug>/ files copied in step 4 are also picked up.
git add pages/home.md messages/YYYY-MM-DD-HHMMSS.md media/messages/YYYY-MM-DD-HHMMSS/ 2>/dev/null || \
  git add pages/home.md messages/YYYY-MM-DD-HHMMSS.md

git commit -m "msg: <first ~60 chars of message, single line>" 2>&1 | tail -3
git push prod main 2>&1 | tail -3
```

The push triggers the post-receive hook on the VPS (~3 s for a small message; longer if media is large). The Lua server restart picks up the new content immediately.

### 9. Sync the renderer (the engine site)

The push above updated the **Lua server** (the SEO layer + `/media`). The engine **renderer** serves its own converted data + owned media (staging `new.a327ex.com` now; `a327ex.com` after the cutover), so it needs its own sync — otherwise the message renders on the Lua site but not the engine site. One command runs the whole renderer pipeline:

```bash
bash E:/a327ex/a327ex-site/renderer/tools/deploy.sh --content 2>&1 | tail -12
```

It reconverts the content, pulls only the **new** owned media the message references (YouTube / tweet via the `uncached_*` gates, embeds, emoji — a text-only message hits no external service), re-subsets fonts, rebuilds the web bundle, uploads new media to R2, deploys to the render dir, and syncs the lazy `/data`. It is **non-aborting** on a media-pull failure (a flaky YouTube/X pull just warns) and idempotent, so re-running is safe.

Read the last line:

- `OK deployed — matched pair …` → the renderer is in sync.
- `FAIL mismatch …` (exit 1) → report it. The message is already live on the Lua server; re-run the command once the cause is fixed.
- If a YouTube/tweet pull *warned* (rate-flagged): the text is synced but the owned media isn't yet — say so, and re-run `deploy.sh --content` later (after the cooldown) to pull it.

### 10. Confirm

One short line listing what was added, the mirror path, the commit hash, and the renderer-sync result:

```
Added — "Cooking exam dream, the broken verifier".
  posts/2026-05-09-115230.md  pushed (abc1234)
  renderer: synced (deploy.sh --content OK)
```

If the renderer sync failed or a media pull rate-flagged, say so on that line instead. Don't preview the full directive body unless the user asks.

## Failure handling

- **Push fails** (network, auth, hook failure): the local commit stays. Tell the user to `cd a327ex-site && git push prod main` once they've fixed whatever blocked it.
- **Write step fails** (filesystem error): report exactly which file and stop. Don't continue to the commit step; nothing has been committed yet, so the user can clean up the partial state if needed.
- **Local file referenced is missing**: stop and ask the user where the file is. Never produce a broken message that points at a nonexistent media path.

## Notes

- "Newest at top" applies inside `#messages-source` only — older articles below stay in place.
- The first time this skill runs, `messages/` should already exist (it's been there since migration); writing the mirror file just adds another `.md`.
- If a message would cross paragraphs, lists, *and* code blocks all at once, walk through carefully or split into multiple `/msg` calls.
- This skill is for **new messages only**. Edits and deletes should be done by hand or under explicit instruction.
- **Tweet threads**: consecutive `::tweet` lines from the same author render as a
  connected thread in the engine renderer (tight gap + avatar spine) — stack the
  directives in thread order.
- **Quote tweets**: the renderer nests the quoted tweet (author, text, media)
  inside the card automatically — one `::tweet` of the quoting tweet is enough.
- **Fancy-Unicode display names** are NFKC-folded at fetch time (fetch_tweets.py
  `fold_name`); symbol glyphs route to Segoe UI Symbol via the is_symbol ranges in
  renderer/elements.lua + tools/subset_fonts.py (KEEP THE TWO IN SYNC). If squares
  appear, extend those ranges — don't hand-edit the manifest.


ARGUMENTS: Anchor 3D playground: Box3D physics + flat-shaded instanced 3D rendering in the Anchor engine, running in the browser. Built by Claude in one session, see the "Fable Test — Anchor 3D" log. Play it here: https://a327ex.com/media/games/anchor3-playground/index.html (desktop mouse recommended: RMB orbit, wheel zoom, LMB grab and drag, B shoot ball, space shockwave, F1 physics debug, R reset)

14:--   ::image, ::video, ::youtube, ::tweet, ::spotify, ::steam, ::iframe, ::game
223:renderers.game = function(args)
225:    if not name then return nil, 'game requires a NAME' end
227:    local src = '/media/shared/games/' .. name .. '/index.html'
229:        '<figure class="iframe-game"><iframe src="%s" ' ..
325:    tweet=true, spotify=true, steam=true, iframe=true, game=true }

220          html_escape(url), html_escape(aspect))
221 end
222 
223 renderers.game = function(args)
224     local name = args.positional[1]
225     if not name then return nil, 'game requires a NAME' end
226     local aspect = args.kvs.aspect or '480/270'
227     local src = '/media/shared/games/' .. name .. '/index.html'
228     return string.format(
229         '<figure class="iframe-game"><iframe src="%s" ' ..
230         'loading="lazy" ' ..
231         'style="display:block; width:100%%; aspect-ratio:%s; border:0" ' ..
232         'allowfullscreen></iframe></figure>',
233         html_escape(src), html_escape(aspect))
234 end
235 
236 -- ---------- block renderers ----------
237 
238 local block_renderers = {}
239 
240 block_renderers.gallery = function(args, lines)
241     local cols = args.kvs.cols or '2'

arena

::game is the established convention (Anchor2's arena already lives at media/shared/games/arena). Let me check how the engine renderer handles the game directive:

renderer\homepage.lua:70:  { title = 'SNKRX',      date = 'May 17, 2021', tag = 'GAME',  url = 'https://store.steampowered.com/app/915310/SNKRX' },
renderer\homepage.lua:71:  { title = 'BYTEPATH',   date = 'Feb 23, 2018', tag = 'GAME',  url = 'https://store.steampowered.com/app/760330/BYTEPATH' },
renderer\main.lua:110:local DEV_HUD = false              -- dev-only corner readout of platform/dpr/css/game/fps/dc (flip on to debug)
renderer\main.lua:172:-- newest-first, so reversing it puts small_games (oldest) at 1 and the newest message last.
renderer\main.lua:599:-- page in chronological site order. From the homepage, next -> first (small_games),
renderer\main.lua:2128:      string.format('game=%dx%d  fps=%.0f  dc=%d', width, height, fps or 0, draw_calls or 0),
renderer\theme.lua:78:  tag          = { SANS.italic,    10 },   -- STORY / GAME / AI LOG feed tags: ~0.85em italic
renderer\ricochet\init.lua:2:  ricochet/init.lua — the toolkit aggregator. `require('ricochet')` (in a game's
renderer\ricochet\init.lua:18:  A game is high-res-smooth OR low-res-rough; `mode` picks the theme profile to
renderer\ricochet\init.lua:30:-- The layer the UI widgets draw to. A game draws its world on its own layer(s);
renderer\ricochet\init.lua:31:-- the UI composites on top of this one. Created here so a game never has to.
renderer\anchor\animation.lua:14:    layer_spritesheet(game_layer, self.anim.spritesheet, self.anim.frame, x, y)
renderer\ricochet\palette.lua:29:  doesn't define separate panel/recess surfaces for light mode. Forked games
renderer\anchor\camera.lua:11:    camera_attach(main_camera, game_layer)
renderer\anchor\camera.lua:12:    layer_circle(game_layer, 100, 100, 20, red())
renderer\anchor\camera.lua:13:    -- ... more draws to game_layer
renderer\anchor\camera.lua:14:    camera_detach(main_camera, game_layer)
renderer\ricochet\theme.lua:7:  low-res game are the FONTS and the ICON set, plus a few default METRICS
renderer\ricochet\theme.lua:13:  480x270 and vector-clean at 1920x1080. A game calls this once at boot (via
renderer\anchor\color.lua:13:    layer_circle(game_layer, x, y, r, red())  -- __call returns packed rgba integer
renderer\ricochet\ui.lua:11:  the public `ui_*` globals; `ricochet_theme_set` calls it. A game writes
renderer\ricochet\ui.lua:26:  Per-frame contract (game's update + draw):
renderer\ricochet\ui.lua:29:              [widgets...]; [game world]; layer_render/draw(...)
renderer\ricochet\ui.lua:122:-- sheets' hue-less look). Widgets pick accents through ric.accent, so a game (or
renderer\anchor\init.lua:5:  that takes config and initializes the engine + global state. The game's

[Showing results with pagination = limit: 25]

4:  Turns a327ex.com source markdown (frontmatter + body + ::directives) into a
15:  ::directives become a dim [TYPE] placeholder + a warning; blockquotes render as
210:-- consume ahead). Returns the element list + a list of unsupported directive names.
291:    elseif t:match('^::%S') then                        -- needs a directive name after ::
298:      elseif typ == 'youtube' or typ == 'short' or typ == 'video' then
300:        -- the youtube/short id, or the original ::video path (matches the manifest key).
301:        -- start="NNN" (seconds) on ::youtube/::short seeks the player there on first play.
325:        -- ::youtube work; the renderer hides it behind per-line bars (Phase E).

291      elseif t:match('^::%S') then                        -- needs a directive name after ::
292       flush_quote(); flush_para()
293       local typ, args = t:match('^::(%S+)%s*(.-)%s*$')
294       if typ == 'image' then
295         -- args is "<url> [alt=... width=...]" -- take the URL token; ignore
296         -- trailing attributes (alt/width) for now (wide layout is Phase 3).
297         els[#els + 1] = { type = 'image', path = rewrite_path(args:match('^(%S+)') or args) }
298       elseif typ == 'youtube' or typ == 'short' or typ == 'video' then
299         -- owned-media element; resolved against data/media.lua at runtime. key =
300         -- the youtube/short id, or the original ::video path (matches the manifest key).
301         -- start="NNN" (seconds) on ::youtube/::short seeks the player there on first play.
302         local key = (typ == 'video') and args or (args:match('^(%S+)') or args)
303         local start = tonumber(args:match('start%s*=%s*"?(%d+)"?'))
304         els[#els + 1] = { type = 'video', kind = typ, key = key, start = start }
305       elseif typ == 'sidenote' or typ == 'note' then
306         -- The live new theme gives .sidenote/.note no CSS, so they render as a
307         -- plain paragraph in the content flow. Single-line form (`::sidenote text`):
308         -- the rest of the line IS the content. Block form (`::sidenote` … `::end`):
309         -- recurse the body and splice it in, swallowing the ::end so it doesn't
310         -- leak as an [END] placeholder. (The old-posts skin can re-introduce a
311         -- bordered sidenote element later — conversion regenerates from source.)
312         if args ~= '' then
313           els[#els + 1] = { type = 'text', kind = 'body', content = parse_inline(args) }
314         else
315           local body, j = {}, i + 1
316           while j <= #lines and not lines[j]:match('^%s*::end%s*$') do
317             body[#body + 1] = lines[j]; j = j + 1
318           end
319           for _, c in ipairs(parse_blocks(table.concat(body, '\n'), nil)) do els[#els + 1] = c end
320           i = j                                          -- land on ::end; trailing i=i+1 moves past it
... [25 more lines]

2026-07-07 20:47:09
18:<div id="messages-source">

14   <hr class="feed-separator">
15  
16  <div id="feed"></div>
17  
18  <div id="messages-source">
19  
20  <article data-date="2026-07-04 12:30:56" data-href="/posts/2026-07-04-123056">
21  <p>Added a chat feature to the website, the bubble on the bottom right. I think it's a huge waste of opportunity that most games do not have a global chat on their main menu, so I've been meaning to do things like this for a while. This is not a global chat, but it's part of said feature that I'll likely add in my next game. One of the nice things that happened during SNKRX's success was that lots of people globally converged on the same thing for a while. To the degree that my job is making people's lives better, it's a waste to not use that convergence maximally, and one of the ways I think that most single-player games lack in this is not using the game as a "third space." The natural way to solve this problem is making the game multiplayer, but there are multiple ways of doing that outside the game itself, and chat-like features are one example. The other natural way is just using Discord, but that's lame as hell and I'd like to try different approaches depending on the game itself, there's lots of room for experimentation. I think as people come to terms with the fact that social media kind of sucks in many ways, there's an opening for such spaces to become more useful. Some of the fondest memories of my youth are the time I spent with my guilds in MMOs, and that kind of experience of the Internet being a physical place, before social media took over, is always a nice goal to strive towards. More details about the chat feature in the privacy note posted below, it's essentially just a chat-with-me kind of function to both test various things on the server and also, well, chat with me.</p>
22  </article>
23  
24  <article data-date="2026-07-03 23:51:11" data-href="/posts/2026-07-03-235111">
25  ::tweet https://x.com/viemccoy/status/2073134727033405658
26  <p>vie's vision goes back to the point made by the <a href="https://a327ex.com/messages/2026-05-09-174843">Mark of the Fool message</a> and how it lets Alex learn.</p>
27  </article>
28  
29  <article data-date="2026-07-03 23:39:53" data-href="/posts/2026-07-03-233953">
30  ::tweet https://x.com/poetengineer__/status/2073103304612012202
31  ::tweet https://x.com/poetengineer__/status/2073104284212687138
32  ::tweet https://x.com/poetengineer__/status/2073107415277441487
33  </article>

The file E:\a327ex\a327ex-site\pages\home.md has been updated successfully. (file state is current in your context — no need to Read it back)

File created successfully at: E:\a327ex\a327ex-site\posts\2026-07-07-204709.md (file state is current in your context — no need to Read it back)

M  pages/home.md
A  posts/2026-07-07-204709.md
remote: [post-receive] deployed at 2026-07-07T23:47:48Z        
To ssh://a327ex/srv/a327ex.git
   c2fd371..37a62c8  main -> main

   R2 sync ok
== deploy bundle + engine-boot.js
   hashed: renderer-bbaf15ce52.data  anchor-c81fbffba0.wasm
== sync lazy /data (content-changed pages only)
   synced 2 changed page(s)
OK deployed — matched pair on VPS (bbaf15ce52b0cbb6e4c13341a618ddd3 a39c7b4302b0fa3ffcaa9747977cf27d )

Updated task #12 status

Anchor 3D playground — a327ex.com
Anchor 3D playground

All three phases are done — the full pipeline is live.

Web build. Box3D compiles clean under Emscripten on the first try (-DBOX3D_DISABLE_SIMD scalar path, mirroring the box2d pattern; anchor.wasm 2.47 MB). New Anchor3/engine/build-web-engine.sh and Anchor3/scripts/package-web-game.sh (with resolution/render-mode args — the playground ships 960 540 auto instead of the pixel-art 480 270 pixelated). Verified in the preview browser: pyramid renders, HUD composites, 60 fps, and a synthesized spacebar shockwave blew the stack apart with the body counter dropping as crates fell past the kill plane. Two real bugs found and fixed along the way: the engine's composite scale clamp cropped the game on viewports narrower than 960 px (now fits down, web-only), and the shell bricked the canvas at 0×0 when the page loaded in a background tab (now guards zero layouts and revives on tab reveal).

Session log. Published publicly as "Fable Test — Anchor 3D":

• Anchor3 repo: bdaa5a2 with the full summary — note it's local-only, no remote configured; say the word if you want a GitHub repo for it
• a327ex-site: 97daabe pushed, post-receive deployed, renderer synced (matched pair)
• Live at a327ex.com/logs/fable-test-anchor-3d

Playable post. The game is hosted at a327ex.com/media/games/anchor3-playground/index.html (verified live, correct application/wasm mime) and the homepage message (posts/2026-07-07-204709, commit 37a62c8) sits above the log in the feed, linking both the game and the log. Renderer synced — verified live on the site.

One judgment call to flag: I used a link rather than the ::game iframe directive — the engine site renders unsupported directives as a dim [GAME] placeholder (only the Lua/SEO layer plays iframes), so a full-page link is the better experience on the real site. If you'd rather have the inline iframe on the mirror pages too, it's a one-line addition to the message.

To test: open a327ex.com — the message should be at the top of the feed; click through to the game, click the canvas to unpause, and it's the same toy you played on desktop (minus RMB-orbit on touch devices — mouse recommended).

Great, however I'd like the game skill to be able to embed the game as a playable frame on the homepage itself, not on a separate place you have to click to open. You'll have to change the game directive. This is actually the first game-like object that the feed contains, so you're the first one doing this and you shouldn't assume the previous ::game directive works as I want it to.

[Request interrupted by user]

Great, however I'd like the game directive to be able to embed the game as a playable frame on the homepage itself, not on a separate place you have to click to open. You'll have to change the game directive. This is actually the first game-like object that the feed contains, so you're the first one doing this and you shouldn't assume the previous ::game directive works as I want it to.

[Request interrupted by user]

Great, however I'd like the game directive to be able to embed the game as a playable frame on the page itself, not on a separate place you have to click to open. You'll have to change the game directive. This is actually the first game-like object that the feed contains, so you're the first one doing this and you shouldn't assume the previous ::game directive works as I want it to.

Understood — make ::game a first-class feed element that's playable inline on the engine site itself. Since the site renders everything inside a WASM canvas, this means the renderer needs to reserve the element's rect and a real <iframe> needs to be overlaid and tracked on top of the canvas — so I need to understand the renderer's element pipeline and what JS bridges already exist before designing this. Let me read the renderer first:

Task #13 created successfully: ::game directive → inline playable iframe on engine site

# Anchor Website Renderer — Plan & Status

Cross-session handoff. Read this first to resume.

## ▶ CHAT + ANALYTICS — IN PROGRESS. ⭐ ORDER REVISED 2026-07-02 (owner): ANALYTICS FIRST, chat on top.

Rationale: analytics data is time-perishable (every week without the token pipeline is visitor
history lost forever; chat delayed loses nothing), and analytics = the same machinery minus the
hard parts (no visitor UI, no text input/soft-keyboard risk, no polling, no console). Chat then
inherits a battle-tested identity layer. User-row decision resolved: devices stand alone
(`user_id NULL`) until a future account-claim flow creates the user ("elevated later").

**✅ TASK 1 DONE 2026-07-02 — server foundation (identity + analytics) LIVE (`e615e40`).**

- **DB:** SQLite at `/srv/a327ex/data/a327ex.db` (OUTSIDE the work tree — deploys never touch it;
  WAL; ms timestamps everywhere). `server/db.lua` = open/pragmas/numbered-migrations + named-param
  helpers (`:name` + bind_names → parameterized by construction). Schema: `users` (empty until
  accounts), `devices` (token = 32-hex /dev/urandom secret; name/muted are chat-era fields),
  `sessions` (one per engine boot; server-stamped `cf-ipcountry`/`cf-ipcity`/UA; ts_last advances
  per batch → durations without trusting tab-close), `events` (narrow, open type vocabulary,
  `data` JSON ≤2KB, ts_server authoritative + ts_client/seq for ordering).
- **Endpoints (`server/api.lua`):** POST `/api/identify` {token?}→{token,new} (mint 30/day/IP);
  POST `/api/analytics/events` (X-Device-Token header, {session, events[≤50]}, all-or-nothing
  validation, tx insert, session_start payload lifted via COALESCE); GET `/api/analytics/summary`
  (X-Admin-Token, d1/d7/d30 visitors/pageviews/sessions/avg-duration + top paths/countries 7d).
  Security bones (transfer to chat): tokens in headers/bodies only + never logged, constant-time
  admin compare, auth-fail lockout 10/hr/IP (refuses BEFORE comparing), no-store on everything,
  no IPs stored (in-memory rate buckets only). server.lua routes `/api/` pre-content-router,
  **pcall-contained** (api failure → 503s, site still serves); `A327EX_PORT` for scratch instances.
- **Secrets:** `/srv/a327ex/data/secrets.lua` (600, adn) = admin_read_token (256-bit) + db_path.
  View on the VPS: `ssh a327ex cat /srv/a327ex/data/secrets.lua` — NEVER paste into chat/logs.
... [50 more lines]

[Request interrupted by user]

A real