was using bullet for doing FEM simulations. i noticed that maybe softbodies/FEM tetrahedral sims aren't as robust (probably because less time has been spent on development as compared to rigid bodies)
i was trying to make the softbodies more rigid. when i did that, i got unstability. i think the sim was exploding (the geomtry/tetras would dissapear)
also collisions didn't work as well, with a lot of interpenetrations.
are there any other FEM physics engines that can handle tetrahedral elements well?