kurtz le pirate wrote:
> hello,
> 
> 
> for a 3d curves defined by a sple, it's easy to define at each points of 
> the cuve, the frenet frame.
> 
> but... how to draw in this new frame ?
> 
> povray has somes functions/utilities/macros to draw in the frenet frame ?
> nothing found on the web...

No, POV-Ray does not currently come with any Frenet frame "drawing" tools.

I have made some macro to do this. (But I do not have time to document 
them.)

I made this image was made by placing a mesh along a Frenet frame 
following a NURBS curve and then subdividing the mesh:

   http://home.no/t-o-k/POV-Ray/Mesh-Moebius_Band.jpg

If anyone is interested, then maybe I can find time to dig up some of 
the macros and put them on my web page.


-- 
Tor Olav
http://subcube.com

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