> I suppose notionally if I knew how it works, I could write something 
> myself.

I often thought about this too, this is usually what is used internally to 
represent the shapes:

http://en.wikipedia.org/wiki/Boundary_representation

But it just gets too complicated too quickly when you have to calculate CSG 
operations, adding rounds to edges etc, it's much harder than raytracing 
CSG!

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