The attached file shows that the distribution of the triangles of the
patch is not even. It also shows how to create the triangles with a
double loop as an alternative to the subdivision approach.

Rune
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3D images and anims, include files, tutorials and more:
rune|vision:  http://runevision.com (updated July 12)
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Download 'bezier_n3_m3_mesh_smooth_d.pov.txt' (9 KB)