alexander
Hi!
Thanks!
So I'm still not quite clear about why you're using pressure on the outer surface. On the inner surface it makes sense to me, to pull/push the fat tight onto the muscles/bones. Haven't actually tried it on the outer surface. I feel like this could be affecting your wrinkling. I would turn it off on that mesh, get the wrinkling right first, then try adding in pressure again to see if it does what you want.
As for your following questions.. when you say "sim the final skin", do you just mean simulating a cloth surface attached to the the fat? Assuming you do..
1. you need the fat to collide with the muscles/bones. so yes you need collision detection on the zSolver. (turn it off for the outer skin cloth though, that doesn't need to collide)
2. you don't need surface tension for the outer cloth (epidermis)
3. you don't need to do anything to surface tension envelope on the outer cloth.
4. our cloth model doesn't support self-collisions (at the time of writing), so it won't matter if that is on or off 😃