is quite cool, as evidenced at least in part by:
http://news.povray.org/povray.binaries.animations/thread/%3C4036deea%40news.povray.org%3E/

But I believe that there might be an error in the normal assignment of the
second version of the macro, the one allowing a closed cubic spline as cross
section.  I'm making objects with it and one side is oddly dark; povray
gives me an error:


----------------------------------------------------------------------------
 Building mesh2:
   - vertex_vectors
   - normal_vectors
File: C:\pov35\INCLUDE\makemesh.inc  Line: 265
Warning: Normal vector in mesh2 cannot be zero - changing it to <1,0,0>.
   - uv_vectors
   - face_indices
Warning: This rendering uses the following experimental feature(s): spline.
The design and implementation of these features is likely to change in
future versions
of POV-Ray. Full backward compatibility with the current implementation is
NOT guaranteed.

Scene contains 1 frame level objects; 0 infinite.

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