On Thu, 07 Oct 1999 13:29:08 +0300, Margus Ramst wrote:
>So why does manual bounding fix the problem?
>What happens to the bounding boxes?

I think the negative radius is just fine in the sphere intersection
code, probably because it uses radius squared for its computations 
so as to avoid taking square roots.  The problem must happen because
the bounding box ends up being "backwards" - i.e. having a minimum
corner of <1,1,1> and a size of <-2,-2,-2>.  The bounding code must
not be able to handle that.  Setting a manual bounding volume makes
POV-Ray ignore the automatically calculated bounds.

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