> (How could POV-Ray determine if some point is inside
> the mesh or not using the information that another point is inside it?)


To determine if point A is inside the mesh, with the information that point
B *is*, shoot a ray from point A to point B, counting the number of times it
intersects the mesh. If it intersects an even number of times (counting 0 as
even), then A is inside the mesh.

 - Slime
[ http://www.slimeland.com/ ]

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