melonjs-physics SKILL.md skillA
melonjs-physics 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-physics@git:20261106.62cc59fPins git:20261106.62cc59f 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-physics/SKILL.md- Versions recorded
- 7
- Latest version
- git:20261106.62cc59f, committed Nov 6, 2026
- First version recorded
- Sep 22, 2026
- Size
- 47,053 bytes
- Repository stars
- 6,441
- License
- MIT
Use this skill for collision, physics bodies, movement, and spatial queries in melonJS — the built-in SAT world and the planck/matter adapters. Covers bodyDef vs Body, collision types and masks, the collision callback family and their firing rules, raycast/queryAABB/querySphere, the behaviour differences between adapters, and which one to pick for a given game. Triggers on: which physics engine, choosing an adapter, rotation collision, rotating body, torque, joints, stacking, Body, bodyDef…
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
# Physics and collision > melonJS has a built-in SAT collision world and two optional rigid-body > adapters. Movement, collision callbacks and spatial queries all behave > differently depending on which is active — and several of the differences fail > silently. ## Choosing a world | | when | |---|---| | **built-in** (default) | Arcade-style: platformers, top-down games. Fast, position-based, not Newtonian. | | **`@melonjs/planck-adapter`** | Full rigid-body dynamics — stacking, joints, realistic restitution. | | **`@melonjs/matter-adapter`** | Same class of thing, backed by matter-js. | ### Picking one Start with the built-in. It is the default for a reason: no dependency, the smallest bundle, and its position-based model is what most 2D games actually want — a platformer's jump arc is a designed curve, not a simulated one, and tuning gravity against a solver you are fighting is a bad afternoon. **Move to an adapter when the game needs something the builtin cannot express**, and these are the usual triggers: - **Rotation that collides.** The clearest signal. The builtin's SAT never reads `body.angle`, so a spinning shape collides as though it never turned. See …
Read the whole file at its exact version.
How to install
mdr add melonjs/melonjs/melonjs-physics@sha256:b92cd4c2e5d12d3fThe line at the top of this page pins the label git:20261106.62cc59f, 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_v5eh63cmfzw6ugfp)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 7 versions of this file, between Sep 22, 2026 and Nov 6, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261106.62cc59f latest | 2026-11-06 | 62cc59f | 47,053 B | A | view · diff |
| git:20261105.7570a25 | 2026-11-05 | 7570a25 | 43,227 B | A | view · diff |
| git:20261011.ea10090 | 2026-10-11 | ea10090 | 42,524 B | A | view · diff |
| git:20260929.f3f1e76 | 2026-09-29 | f3f1e76 | 42,498 B | A | view · diff |
| git:20260927.be310d3 | 2026-09-27 | be310d3 | 40,381 B | A | view · diff |
| git:20260922.b53c8d0 | 2026-09-22 | b53c8d0 | 38,621 B | A | view · diff |
| git:20260922.676314b | 2026-09-22 | 676314b | 38,007 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 (47053 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_v5eh63cmfzw6ugfp GET https://markdownregistry.com/api/v1/resolve?ref=melonjs/melonjs/melonjs-physics GET https://markdownregistry.com/api/v1/blob/b92cd4c2e5d12d3fec670b3ef5b59681cdff1695b925d8c9ceab7081977debef
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.