Didn't mean to breach posting rules.
 So fine, there's an intrinsic problem with bicubic patches and surface
normals. I don't really care that I can't make a sphere with them, they work
just fine for the other things I use them for (lathes and organic things
look great!).
 Does anyone have any suggestions? I just need a real Z-coord for the
surface normal.
 -Eli

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