Am 17.08.2013 01:54, schrieb Bald Eagle:
> POV-Ray obviously knows "where" two objects intersect.

No, it doesn't.

It can only (1) find individual points on the surface of any single 
primitive, and then (2) check whether any such individual point is 
inside a given set of other primitives.

(Note that this is exactly what the trace() and inside() functions do.)

This is the way POV-Ray does all its CSG operations.

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