I think Inico's info might be a bit more reliable. I do 3D modeling, mostly, so I kind of grasp it from a technical perspective, but I haven't ever interpreted Blizzard's work the way he probably does on a daily basis. Since their engine is also custom, their way of going about it might be entirely different from what I know, too.
Still, you're welcome. Always nice to see people who appreciate or enjoy that knowledge.