Building Verlet physics (position and acceleration) and XPBD (collision) in Geometry nodes!
[https://www.youtube.com/watch?v=YTUYyL9tbro](https://www.youtube.com/watch?v=YTUYyL9tbro)
https://www.youtube.com/watch?v=YTUYyL9tbro
I’m following this step by step, which requires lots of pausing, but I’m learning a bunch about how physics works with Geometry Nodes, Simulation Zone, Repeat Groups, etc. I’m only doing a few small changes as I follow along.
Verlet physics with constraints for keeping endpoints still, and keeping points elastic, with gravity.
24 minutes into video, about an hour of my time.
It’s alive. 🤩
Continuing the tutorial to add collisions.
🎉
Repeat group to make the simulation solve “better” on each frame. Without this, the points jump around a bunch between frames. Gravity is only added once per frame, then these elastic and collision constraints can run 10 - 100 times.
Elastic (points want to maintain their distance). These “previous” and “next” frames are basically duplicated logic with +1 and -1, could they be abstracted?
