Tor, Bill,

Thanks for your attention to this problem.

> I'm not sure how the data is generated from MatLab in order to be exported to
> triangles for POV-Ray, but I'm thinking that it might be better to export the
> geometry for the mesh separately, and then run a macro in POV-Ray to calculate
> the normals and color interpolation - or use the gradient y pigment.

Probably a good idea, now all data: geometry, normals and colors is fetched
directly from structure returned by surface method without any modifications.

I will play with vertex order as Tor suggested, but please take into account
that effect is mostly visible on high elevation (along the vertical axis).

Playing with surface parameters:
.....
s = surf(x,y,z, FaceColor = 'interp', EdgeColor = 'interp');
.....
gives nothing, also increasing mesh density eliminates this effect, as was
expected.
> Purely as a sorting macro exercise for myself, which might prove useful to
> someone else int he future.
No doubt )

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