> But when doing a test render, I had to realize that the two 4 x 4
> sections do not align in the y direction, as you can see in the image
> attached here! What went wrong?

Inner Points on the bicubic patch are just control points, not points *on*
the surface. If you overlap them like that, they don't add up. What you're
after is 2nd order continuancy, e.g. the relation controlpoint-edgevertex
from one patch to the next need to be the same. They share the same border.

Regards,
Tim

-- 
aka "Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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