I wrote:
> Thanks everybody, this is exactly what I need - I just didn't rtfm
> far enough.  (smooth_triangles are not covered in the tutorial.)
> 
> Does the magnitude of the normal vector have any effect?
> What if its sign (relative to the surface) changes?

A bit of experiment suggests that magnitude is irrelevant
but sign can have weird effects.

-- 
"How'd ya like to climb this high without no mountain?" --Porky Pine
Anton Sherwood   *\\*   +1 415 267 0685   *\\*   Ant### [at] jpsnet

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