[cutlilacs]

Sorry if I'm misunderstanding, but isn't FEM used in physics engines because it is an good approximation for the underlying physics? For example, I believe the Drake Physics engine uses FEM to model deformable materials relating to vehicle crashes at Toyota

[Y_Y]

FEM is just a numerical technique for solving some kinds of differential equations. It doesn't aitomatically make you accurate or not, just like any other stable solver.