So here's a thing I've never understood... Why do so many 3D games have 
trouble getting two objects to touch each other?

For example, that scene from FarCry 3 where you present Citra with the 
knife. It's pretty-much a cut-scene, yet even here, the mighty CryEngine 
seems to be struggling to get the knife to rest *on* Citra's hands, 
rather than partially intersecting them.

Why is that?

I can understand that it's hard to do the physics of simulating complex 
non-flat (and possibly deformable) objects resting on each other. (Hence 
the ubiquitous flailing rag-dolls.) But this is a pre-scripted 
animation. You've GOT the coordinates of Citra's hands RIGHT THERE! (And 
they're always the same.) How hard can it be?

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