"Dan Connelly" <djc### [at] yahoocom> wrote in message 
news:48f6195e@news.povray.org...
>I attempted a calculation of normal vectors for this mesh2 object.

You just beat me to it :o)

We've both used very similar techniques. I was just investigating some dark 
lines that I get along the edges of the grid and light lines along the 
diagonals of the triangles (I notice you got them too), but I've concluded 
that it's just due to the fact that the z distances are relatively large.

Regards,
Chris B.

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