Buy a good book(s) on quaternion mathematics / calculus, and you too will be able to handle collision detection with polygons. Collision detection would absolutely ROXOR, but it ain't something that happens easily (which is why we haven't seen it in four+ versions of Poser). I have a feeling that if it DOES happen any time soon, it will just be boundary box collision -- useful, but still requiring tweaking. Until then, I just use the patented (on soon on sale at Renderosity) Scharmers Mk. I Eyeball method of collision detection. :) ;P