Individual skill
melonjs-3d
Use this skill for anything 3D or 2.5D in melonJS — Camera3d, Mesh, InstancedMesh, Sprite3d billboards, Light3d, ground shadows, glTF/GLB scenes, and depth sorting. Covers the Y-down/+Z-forward convention that is the inverse of OpenGL, the cameraClass opt-in, clip planes, and what does not work on the Canvas fallback. Triggers on: Camera3d, Mesh, InstancedMesh, Sprite3d, Trail3d, ribbon, exhaust trail, Light3d, billboard, glTF, glb, 3D, 2.5D, depth, cameraClass, fov, setClipPlanes, setFog, fog, distance fog, height fog, heightFalloff, transparent, transparency, alpha, blendMode, fade, castGroundShadow, lit, setBasis, getBasis, lookAt, up vector, gimbal, slerp, great circle, turn a direction.
packages/melonjs/skills/melonjs-3d/SKILL.md
Source commit a41d6a328557d69a0441d79bbeb9cd6c430275b5
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 5, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 6,440
- Repository last updated
- Nov 7, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- html5-game-engine Repository topic
- javascript-game-engine Repository topic
- 2d Repository topic
- agent-skills Repository topic
- canvas Repository topic
- contributions-welcome Repository topic
- game-development Repository topic
- game-framework Repository topic
- gamedev Repository topic
- gltf Repository topic
- engineering Derived category
Files and excerpt
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# 3D and 2.5D in melonJS
> melonJS is a 2D engine that grew a real 3D tier: perspective cameras, meshes,
> instancing, glTF scenes and 3D lights. Most of what a model "knows" about 3D
> graphics comes from the OpenGL convention, and **melonJS's is the inverse**.
> Read the conventions section before writing any 3D code.
## Coordinate conventions — the inverse of OpenGL
This is the single most important thing on this page.
| | melonJS | OpenGL convention |
|---|---|---|
| vertical | **Y-down** — higher `y` is *lower* on screen | Y-up |