> In fact, my understanding is whether it is closed or not is irrelevant.  
> Even if you define a simple closed polyhedron,  if you don't have an 
> inside_vector defined properly, the system has no way of determining if 
> that's a finite solid or a hole in an infinite solid.


As is often the case, my understanding was flawed.... there's no way to define a mesh
which is a hole in an infinite solid without CSG.  So a closed mesh really is
unambiguous, assuming no numerical issues.

Dan

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