This is my Houdini bullet solver I started ages ago, it's called bounce, I've recently had some time to give it a little more love.

It's a Bullet solver running in Houdini SOPs, it's pretty fast -- this first shot in the video took 14 minutes and contains 30000 convex hull rbds and 300000 6dof constraints.

I plan to add more features to it as time allows, here's what it currently supports;
Shed loads of constraints
Convex Hull RBD shapes
Dynamic activation of bodies
Animated passive objects
Custom forces and runtime feedback..



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