On Sun, 13 Jun 1999 23:58:46 -0400, Lummox JR wrote:
>Zero should produce a very flat surface--but interestingly, it will
>remove the two-triangle appearance caused by no smoothing at all.

This is true.  It's because the normal is interpolated (or in this
case, averaged) across the square, not across the two triangles.  
The triangles end up being rendered with a different normal than 
they actually have.  This is interesting code, but I'm not sure
whether 'smooth' is the right word for what it does.

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