Check out a similar thread under povray.programming from myself entitled "3d
Geometry--averaging normals"

Andrea Ryan <ary### [at] global2000net> wrote in message
news:37C31633.E00778A0@global2000.net...
> Hi there! I'm Brendan Ryan.
> If anyone knows the formula that POV-Ray uses to calculate the normal
> vectors for smooth triangles, please let me know. I just want to make
> one or two smooth triangle and play around with them.
> By the way, I'm using POV-Ray 3.1g in Windows 95.
>

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