Bald Eagle <cre### [at] netscapenet> wrote:
> POV-Ray obviously knows "where" two objects intersect.

Actually, it doesn't. Not really.

What POV-Ray does is that it tests the ray against one object and then
the other, and if the ray hits both, it just looks which hit point is
closer.

In other words, POV-Ray knows which surface is closer (for that particular
ray), but doesn't really know where exactly the two surfaces interset.
That information is not really needed for raytracing.

-- 
                                                          - Warp

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