# bulletphysics/bullet3

Bullet Physics SDK: real-time collision detection and multi-physics simulation for VR, games, visual effects, robotics, machine learning etc.

Repository: https://github.com/bulletphysics/bullet3
Canonical: https://ross.abutalabs.com/products/bullet3
Homepage: http://bulletphysics.org
Language: C++
License: NOASSERTION
License Family: other
Topics: simulation, robotics, kinematics, virtual-reality, reinforcement-learning, computer-animation, game-development, simulator, pybullet
Last push: 2025-10-22T02:13:14+00:00

## Health v2 (maintenance only)
Score: 44/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 48, release rhythm 8, longevity 100
- inputs: {"age_days": 5622, "days_push": 316, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 14700, forks 3092 (observed 2026-08-28T04:11:07.485780+00:00)

## What it is
Bullet Physics SDK is a C++ library providing real-time collision detection and rigid/soft body multi-physics simulation, with Python bindings via PyBullet. It is widely used in games, VR, visual effects, robotics, and reinforcement learning research.

## Use cases
- add physics simulation to a 3D game engine
- simulate robots with URDF models for robotics research
- train reinforcement learning agents in physics-based environments
- simulate rigid and soft body dynamics in real time
- run collision detection on the GPU with OpenCL
- generate synthetic datasets for machine learning with PyBullet

## When to choose
- you need a mature, permissively licensed (zlib) real-time physics engine
- you want Python bindings for robotics or RL simulation
- you need cross-platform C++ physics with optional GPU acceleration

## When to avoid
- you need a highly accurate offline/industrial FEA solver rather than real-time physics
- you require extensive commercial support or active issue-tracker assistance
- you need modern C++ standards beyond C++03 compatibility

## Facets
- artifact type: library
- maturity: stable
- function: simulation, graphics, machine-learning, sdk
- domain: simulation, robotics, reinforcement-learning, computer-vision, graphics
- platform: cross-platform, cpp, python, windows
- tags: physics-engine, collision-detection, rigid-body-dynamics, pybullet, soft-body, urdf, vr, opencl, reinforcement-learning-environments, game-development, linux, macos, android, ios, gpu

## Member repositories
- bulletphysics/bullet3 (main) score 44

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:07.485780+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 2026-08-29T17:07:18.644231+00:00, confidence not recorded.
  - readme: https://github.com/bulletphysics/bullet3 (fetched 2026-08-28T04:11:07.485780+00:00, sha 50ee6212ddfc)
  - homepage: http://bulletphysics.org (fetched 2026-08-29T08:06:05.036264+00:00, sha 54b1015fc81b)
  - site_page: https://pybullet.org/wordpress/index.php/forum-2 (fetched 2026-08-29T08:06:05.039911+00:00, sha 4480d30291c5)
  - site_page: https://pybullet.org/Bullet/phpBB3/viewtopic.php?f=9&t=15500&p=44526 (fetched 2026-08-29T08:06:05.041665+00:00, sha 5178dc29a41f)
- Data as of 2026-08-30T08:39:29.467469+00:00.