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Box3D - A new open-source 3D physics engine
Box3D is a new open source 3D physics engine by Erin Catto, the creator of the widely used Box2D physics engine. Development of the engine began in 2022 and has now resulted in its initial release. According to the developer, the project was driven by several motivations, one of the primary reasons being issues encountered with Unreal Engine's native physics while developing his own game, The Legend of California. These included the lack of support for simulating gyroscopic torques, falling trees behaving erratically, and the need to perform a fast broad-phase physics pass when simulating very high entity counts, reaching into the hundreds of thousands.
Published: 14. Jul. 2026