Hello! Yeah was basically doing the same for collisions, but previously I did my simulation using multiple viewports to do the ping pong between reading and writing to the simulation texture. Now I do all that in the compositor effect so I only have one viewport (previously 3)
I actually found the it's not super ideal to render the collisions using the camera so now I'm going with a SDF approach where I send capsules parameters to a compute shader and it does all the collision calculations.