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Box3D | A revolutionary new physics engine developed by Erin Catto in collaboration with a Valve dev

2026-07-06 20:02 UTC

After seeing its announcement a few days ago I didn’t think much of it, but after looking into it a bit this looks awesome ! Blog Post Github Box3D was released a few days ago by legendary developer Erin Catto accompanied by a blog post, this is the person behind the popular Box2D engine. In the blog post he explains that his work stems from his collaboration with Dirk Gregorius, “Principal Software Engineer II and Physics Architect” at Valve, the person behind Half-Life: Alyx’s physics engine “Rubikon”, which Box3D is based off. Facepunch has also revealed that they have been using Box3D for about a year now as well in s&box. Showcasing a cool demo An interesting quote from the blog post: On the Valve side, Rubikon continues to evolve and Dirk has developed optimizations (similar to those in Box3D) in a new engine called Ragnarok. Look for that in future Valve games. 👀 Did he just reveal Valve’s next physics engine ? +HL3 confirmed cool showcase 1 showcase 2 showcase 3 in gmod (already??) Tweet transcript I’m happy to announce the release of a new open source 3D physics engine called Box3D. I’ve been working on this project for a few years now, but it represents over 20 years of experience writing physics engines for games. Read more here: [blog post link]

Replies (1)

  • @DarkCloud@lemmy.world 2026-07-06 20:39

    Pretty sure most game engines already have 3D physics engines… Which is why this news keeps falling flat. I don’t really get what’s being offered. Is it free? Is it vastly more efficient? Is it being incorporated into one of the big three game engines?

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