melonjs-3d SKILL.md skillA
melonjs-3d from melonjs/melonjs is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add melonjs/melonjs/melonjs-3d@git:20261016.2f86055Pins git:20261016.2f86055 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- melonjs/melonjs
- Path
packages/melonjs/skills/melonjs-3d/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261016.2f86055, committed Oct 16, 2026
- First version recorded
- Oct 6, 2026
- Size
- 56,504 bytes
- Repository stars
- 6,441
- License
- MIT
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…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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 | | depth | **+Z forward** — higher `z` is *farther* away | −Z forward | `Camera3d` exposes three rotation angles: `camera.pitch` (X, look up/down), `camera.yaw` (Y, look left/right) and `camera.roll` (Z, bank the horizon). The view is `R(yaw) ∘ R(pitch) ∘ R(roll)` inverted, and the frustum planes come off that same matrix — so culling follows a banked view. The basis those angles produce is **readable and writable**: `getBasis(right, up, forward)` reads it, `setBasis(right, up, forward)` poses the camera from one. `camera.rotate()` is NOT the way to bank a 3D camera. It writes the inherited …
Read the whole file at its exact version.
How to install
mdr add melonjs/melonjs/melonjs-3d@sha256:856c66f66933655aThe line at the top of this page pins the label git:20261016.2f86055, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_67hiydp5dvcsfan7)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Oct 6, 2026 and Oct 16, 2026, about one every 3 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261016.2f86055 latest | 2026-10-16 | 2f86055 | 56,504 B | A | view · diff |
| git:20261016.4a259bf | 2026-10-16 | 4a259bf | 54,847 B | A | view · diff |
| git:20261011.806ee0a | 2026-10-11 | 806ee0a | 53,546 B | A | view · diff |
| git:20261011.ea10090 | 2026-10-11 | ea10090 | 51,359 B | A | view · diff |
| git:20261006.555c543 | 2026-10-06 | 555c543 | 47,825 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (56504 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
melonjs/melonjs · 6,441 stars · license MIT · pushed 2026-11-06 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_67hiydp5dvcsfan7 GET https://markdownregistry.com/api/v1/resolve?ref=melonjs/melonjs/melonjs-3d GET https://markdownregistry.com/api/v1/blob/856c66f66933655abdb51beb0c39c9b71ad375aa26093ad2a9fbae5a82f62763
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.