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Erin Catto announces Box3D, an open-source 3D physics engine forked from Box2D, adding triangle mesh collision, height-field collision, and wide SIMD contact solver, built for use in Unreal Engine for the game 'The Legend of California'.
Google DeepMind maintains MuJoCo, a high-performance open-source physics engine with C/Python APIs and Unity plugin for robotics and ML research.