On Wed, 6 Mar 2002 11:13:31 -0600, "Shay" <sah### [at] simcopartscom> wrote:
> Writing the formula as a function MIGHT speed
> it up, but with only 2 operations per calculations I'm not sure.

Well, you can check my investigation in
http://news.povray.org/f4sa5uomgj1v158rjs159ms75midq7qm52%404ax.com
that function is fastest way of calculations

> The method described by ABX is necessary only for non-square meshes.

I can be wrong becouse I not studied your sources enough but looking at
pictures on http://news.povray.org/3c84365e%40news.povray.org your triangles
are non-square. Only projection onto xz plane (considering y is up) are
square.

ABX

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