# kripken/ammo.js

Direct port of the Bullet physics engine to JavaScript using Emscripten

Repository: https://github.com/kripken/ammo.js
Canonical: https://ross.abutalabs.com/products/ammojs
Language: C++
License: NOASSERTION
License Family: other
Last push: 2026-06-16T19:27:27+00:00

## Health v2 (maintenance only)
Score: 71/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 87, release rhythm 35, longevity 100
- inputs: {"age_days": 5576, "days_push": 78, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4558, forks 581 (observed 2026-08-28T04:08:53.426611+00:00)

## What it is
ammo.js is a direct port of the Bullet physics engine to JavaScript and WebAssembly using Emscripten, with autogenerated bindings that mirror the original C++ API. It supports rigid body dynamics, soft bodies (rope, cloth, volume), heightmap terrain, and vehicles in web applications.

## Use cases
- add physics simulation to a WebGL game in the browser
- simulate cloth or rope soft bodies in JavaScript
- run Bullet physics engine in a web page
- build a vehicle physics demo with WebGL
- use rigid body collision detection in a browser game
- port C++ physics code to the web

## When to choose
- you need the full Bullet physics feature set (soft bodies, vehicles, heightmaps) in JavaScript
- you want API parity with the original Bullet C++ engine
- you are building a browser game or WebGL demo needing realistic physics

## When to avoid
- you write your game in C++ and compile with Emscripten (use Bullet directly via emscripten-ports instead)
- you need a lightweight, hand-written JS physics engine with simpler integration
- you need strong TypeScript typings or modern package management out of the box

## Facets
- artifact type: library
- maturity: maintenance
- function: simulation, graphics, game-engine, wasm
- domain: graphics, simulation, web-development
- platform: browser, wasm, cross-platform
- tags: physics-engine, bullet-physics, emscripten, webassembly, rigid-body-dynamics, soft-body, collision-detection, game-development, javascript

## Member repositories
- kripken/ammo.js (main) score 71

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:53.426611+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:20:01.599991+00:00, confidence not recorded.
  - readme: https://github.com/kripken/ammo.js (fetched 2026-08-28T04:08:53.426611+00:00, sha 4f017f5b9d1a)
- Data as of 2026-08-30T08:39:29.467469+00:00.