wayne461 wrote:


> So do you know if the eval_3d_spline macro converted into POVRAY 3.6
> anywhere?

Don't know.  I barely remember it or it's history, where it came in etc. 
  I think I used it but really didn't understand the value added. 
Probably too subtle for me.  But it doesn't add anything significant 
here.  It just returns a point on the spline afaik
> 

Anyway I came up with a brute force seam spline which you can find 
posted in p.b.scene-files.  There is also some code there for walking 
the spline and creating a parallel set of points on either side of a seam.

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