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Box2D

Box2D is a 2D physics engine for games.

Features

Collision

• Continuous collision detection
• Contact events and sensors
• Convex polygons, capsules, circles, rounded polygons, segments, and chains
• Multiple shapes per body
• Collision filtering
• Ray casts, shape casts, and overlap queries

Physics

• Robust Soft Step rigid body solver
• Continuous physics for fast translations and rotations
• Island based sleep
• Revolute, prismatic, distance, mouse joint, weld, and wheel joints
• Joint limits, motors, springs, and friction
• Joint and contact forces
• Body movement events and sleep notification

System

• Data-oriented design
• Written in portable C17
• Extensive multithreading and SIMD

Samples

• OpenGL with GLFW and enkiTS
• Graphical user interface with imgui
• Many samples to demonstrate features and performance

Building

• Install CMake
• Ensure CMake is in the user PATH
• Visual Studio: run build.bat from the command prompt
• Otherwise: run build.sh from a bash shell
• Results are in the build sub-folder
• On Windows you can open box2d.sln

Building for Xcode

• Install CMake
• Add Cmake to the path in .zprofile (the default Terminal shell is zsh)
  • export PATH="/Applications/CMake.app/Contents/bin:$PATH"
• mkdir build
• cd build
• cmake -G Xcode ..
• open box2d.xcodeproj
• Select the samples scheme
• Edit the scheme to set a custom working directory, make this be in box2d/samples
• You can now build and run the samples

Compatibility

The Box2D library and samples build and run on Windows, Linux, and Mac.

Box2D should be built on recent versions of clang and gcc. You will need the latest Visual Studio version for C11 atomics to compile (17.8.3+).

AVX2 CPU support is assumed on x64. You can turn this off in the CMake options and use SSE2 instead. There are some compatibility issues with very old CPUs.

Documentation

• Manual
• Migration Guide

Community

• Discord

Contributing

Please do not submit pull requests. Instead, please file an issue for bugs or feature requests. For support, please visit the Discord server.

Giving Feedback

Please file an issue or start a chat on discord.

License

Box2D is developed by Erin Catto and uses the MIT license.

Sponsorship

Support development of Box2D through Github Sponsors

Ports, wrappers, and bindings

• https://github.com/EnokViking/Box2DBeef
• https://github.com/HolyBlackCat/box2cpp