[some complicated Math stuff abd derivative, Bernstein polynomials etc]
SNIP
> I hope this helps.

I did. Though that part about diffenciating the Bernstein polynomials, that
was a little above my head. Still, the other approach works fine and seems
to return actual normals, not just approximations. At least looks like that.

Regards and thanks a lot,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
Email: tim.nikias (@) nolights.de

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