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I'm pretty confident in my understanding of the math behind sphere->polygon collision, but there's one thing...

I don't know which vertices are the ones forming faces.

Pretty simple question; I'll be poking around in the DX SDK doc. and opening a few .x files with notepad to see if I can find out how to find out which vertices are connected together in faces—at least in the .x format—though I'd also just like to know how to find that out from a mesh loaded into the game with DBP as well.. I'll search around threads to see how to get a handle to DBP objects; I remember seeing something about getting a pointer to the address of its data or what.

So that's it then.

Well, normally, each 3 vertices make a new face, but sometimes models use indice data. Basically, each 3 indices point to vertices which make a face

Ahh, I've always wondered what this "indice" wickedness was. Thanks much

The reason I knew that just going from tri-vertice-set to the next three was because
1) vertices are often re-used for different faces and
2) not all vertices are connected

now begins the hunt for getting a hold on these indices...