"Warp" <war### [at] tagpovrayorg> wrote in message
news:3cb22b06@news.povray.org...
>
> the normal at X is the interpolation of the normal > vectors at 'y' and
'z', that is,
> the weigthed average of the normals, where the
> weighting factor is the
> distance of X from y or z.

This could get messy really quickly if y or z is on the side of a triangle
as well.

 -Shay

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