>    There's no reasonable way for POV-Ray to tell for sure if two
> objects are intersecting or not.

Ah, but there are always the unreasonably cumbersome ways to know whether it
is likely.... You can also render that CSG difference scaled to fit the
screen and have your pet monkey tell you whether it sees any color....  Or
you could make use of a trace, or feed the above rendering back in and use
eval_pigment instead of the monkey.

Who needs "reasonable"? :)

Charles

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