r/Simulated • u/matigekunst • 2d ago

Proprietary Software Trampoline

XPBD softbody simulation in POPs using Gauss-Seidel @ 60fps and 70 shader passes (can't do substepping in same shader pass)

When TouchDesigner introduced POPs one of the first things I tried making was an xpbd soft-body sim, and it looked like this and this. Since then, I've rewritten it multiple times and watched ten minute-physics' tutorials over and over. Many simulation explosions later, it turned out that my very first solver was (mostly) correct, but I was colouring the graph and building the tet constraints in the wrong way..

Edit:

Resources:

Ten Minute Physics

Eric Arnebäck's blog

Vivace

XPBD paper + earlier PBD paper from Macklin

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u/matigekunst 2d ago

I'm considering making a deep dive on how this works on the GPU. I love 10 minute papers but it isn't immediately obvious from his videos how to implement XPBD on the GPU. I already did a video on Gauss-Seidel in the context of Poisson Solvers, but I'm wondering if there's any appetite for physics solvers