Warp wrote:

>   There's nothing really strange about solid meshes which do not form a
> closed surface, as long as the inside_vector is defined properly.
> 
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.

It's all about the inside_vector...

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