I have a bezier-patch (bicubic_patch) which describes the top of a 
'inward-dented' box. Now I want to use the bezier-patch as the top of 
this box. I already succeeded in doing so when the 12 outer points of 
the patch all reside in the same plane. It is then possible to use 
that plane as the top of a hollow box (which has its own top-plane 
removed).

Now the problem: Some of the 12 extreme points (the ones which are at 
the sides of the patch) have been moved a bit "into" the box. They are
still in the side-planes of the box, but not in the top-plane anymore.
Is there a way to bound the box so that it fits the bezier-patch?

Or: Is there another figure I can use which will result in a box with 
the bezier-patch top?

bye, Erik

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[Don't mail posts, I will see them here just fine]

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