Hei Lars Petter.
Here's a norwegian page about Frenet frames and a little about
sweeping along Bezier curves:
http://www.ia.hiof.no/~borres/gb/ma-frames/p-frames.html
The modelling is done with OpenGL.
I hope this page has some relevance to your project.
Btw.:
POV-Ray's parametric obejct renders very slow, so I recommend
you to have a look at Ingo's macros if you need render
parametric shapes.
--
Tor Olav
http://subcube.com
http://subcube.net
