I agree with you whole-heartedly on the value of SDL.  While mesh models
certainly are valuble for many things, as a machinist I daily carve parts
out of solid blocks of metal and simply THINK in CSG.  The ablity of POV to
use multi-dimensional, array defined, splines is a powerful yet poorly
documented feature that has taken it out of hobby status and solidly put it
on my workbench.  I hope in future versions to see more tools like pipes to
get the data directly into CAD/CAM instead having to dump via #debug into a
file.


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