On Thu, 18 Mar 2004 13:02:46 -0800, Darren New <dne### [at] sanrrcom>
wrote:

>If the cylinder X only intersects C, then you need to have
>   union (A, B, intersection (C, X inverted))
>aka
>   union (A, B, difference(C, X))
>
>Then POV is smart enough to know that the bounding box for
>   difference(C,X)
>can't be bigger than the bounding box for C.

Got it.  Thanks, all, for finally getting this into me.  I'll continue
to do some tests, here, but I've already seen clear evidence of this.

- How

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