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base on Box2D is a 2D physics engine for games 
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# Box2D
Box2D is a 2D physics engine for games.
[](https://www.youtube.com/watch?v=dAoM-xjOWtA)
## Features
### Collision
- Continuous collision detection
- Contact events
- Convex polygons, capsules, circles, rounded polygons, segments, and chains
- Multiple shapes per body
- Collision filtering
- Ray casts, shape casts, and overlap queries
- Sensor system
### 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
- Optimized for large piles of bodies
### Samples
- OpenGL with GLFW and enkiTS
- Graphical user interface with imgui
- Many samples to demonstrate features and performance
## Building for Visual Studio
- Install [CMake](https://cmake.org/)
- Ensure CMake is in the user `PATH`
- Run `create_sln.bat`
- Open and build `build/box2d.sln`
## Building for Linux
- Run `build.sh` from a bash shell
- Results are in the build sub-folder
## Building for Xcode
- Install [CMake](https://cmake.org)
- 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
- Build and run the samples
## Building and installing
- mkdir build
- cd build
- cmake ..
- cmake --build . --config Release
- cmake --install . (might need sudo)
## Compatibility
The Box2D library and samples build and run on Windows, Linux, and Mac.
You will need a compiler that supports C17 to build the Box2D library.
You will need a compiler that supports C++20 to build the samples.
Box2D uses SSE2 and Neon SIMD math to improve performance. This can be disabled by defining `BOX2D_DISABLE_SIMD`.
## Documentation
- [Manual](https://box2d.org/documentation/)
- [Migration Guide](https://github.com/erincatto/box2d/blob/main/docs/migration.md)
## Community
- [Discord](https://discord.gg/NKYgCBP)
## 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. You can also use [GitHub Discussions](https://github.com/erincatto/box2d/discussions).
## License
Box2D is developed by Erin Catto and uses the [MIT license](https://en.wikipedia.org/wiki/MIT_License).
## Sponsorship
Support development of Box2D through [Github Sponsors](https://github.com/sponsors/erincatto).
Please consider starring this repository and subscribing to my [YouTube channel](https://www.youtube.com/@erin_catto).
## External ports, wrappers, and bindings (unsupported)
- Beef bindings - https://github.com/EnokViking/Box2DBeef
- C++ bindings - https://github.com/HolyBlackCat/box2cpp
- WASM - https://github.com/Birch-san/box2d3-wasm
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