Box3D, an open source 3D physics engine

2026-07-01 | original

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Why This Matters

Box3D is a new open-source 3D physics engine designed to address limitations in existing engines like Unreal's Chaos, offering advanced collision detection and multi-threading for more realistic physics simulations. Its release provides developers with a versatile tool to improve game physics, especially for complex interactions and large worlds, fostering innovation in game development and simulation industries.

Key Takeaways

Box3D extends Box2D with 3D features like triangle mesh and height-field collision.
It offers multi-threading, continuous collision detection, and large world support, enhancing performance and realism.
Developed partly to overcome limitations in Unreal's Chaos physics engine, enabling more accurate and stable physics simulations.

I’m happy to announce the release of Box3D, an open source 3D physics engine. It is now available on GitHub.

Box3D repository

You can think of Box3D as a fork of Box2D, extended with many features needed for 3D games. Some additions:

Triangle mesh collision

Height-field collision

Baked compound collision

The core architecture of Box3D remains almost identical to Box2D.

C API

All library source is C17

Sub-stepping solver

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