Real-Time Collision System Built In Blender's Geometry Nodes

Gurgen Aloian may turn it into a release or a tutorial.

This isn't Blender's built-in rigid body or cloth physics. Instead, Gurgen Aloian created a custom "fake" collision setup in Geometry Nodes, originally to make sculpting collisions easier during animation. What makes it so impressive is that everything runs interactively in real-time, essentially turning Geometry Nodes into a lightweight collision solver without relying on the traditional physics systems.

Gurgen explained the setup like this:

"No physics involved. It's super stylized in that regard. It's pretty much – is it inside another mesh? Backfire normals to the outer shell – set position. Get the mean position of the outer shell mesh boolean. Displace the mesh outwards from that position."

He's also mentioned that if two objects using the same setup collide, it should still work, but each mesh may be affected differently. You can read more about this system on Reddit.

Gurgen Aloian is planning to either turn it into a proper product release or make a tutorial explaining how it's made. This is what the node setup looks like:

Gurgen Aloian

Meanwhile, you can check out Gurgen Aloian's animation work:

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