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Kintsugiyama

Box3D is now open source

The Box3D physics debugger, showing collision hulls around felled redwood trunks.

Today Erin Catto announced the release of Box3D, an open source 3D physics engine. It’s the same physics engine already running in The Legend of California, handling everything from falling redwoods to ragdolls to voxel terrain.

We’re extremely proud to be one of the first games built on Box3D, and even happier to help support an open source resource the entire gaming community can benefit from.

Watch Introducing Box3D on YouTube. Opens youtube.com in a new tab.

Read Erin’s full announcement here: https://box2d.org/posts/2026/06/announcing-box3d/

Congratulations, Erin!

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