Your question's been answered, but I would point out to you that if you want to
do an arc greater than 180 degrees, you must intersect or difference with a
merge of two planes, because a plane obviously can't be more than 180 degrees.

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David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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