[Algorithms] Bicubic normals for a bicubic world

[John S. <jse...@ho...>]

Hi! I'm new to this list, but already I'm asking questions... ;-)

Does anyone here know how I can approximate the normals across a bicubic
surface (i.e.: a Bezier patch) using another bicubic? I want to use normals
for backface removal, and a simpler interpolation doesn't help much. On the
other hand, an exact biquintic solution would be too expensive to compute.

Thanks.

John Sensebe
jse...@ho...
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