Jim Charter wrote:

> ... you used boolean subtraction of torii?  Again I have been
> trying exactly the same approach but with POV CSG.  The problem
> I had was getting the circumference of the torus to decrease at
> an rate appropriate to the diminishing circumference of the tapering
> shaft.

How about sphere_sweeps for column and flutes? Evaluating the spline
functions would give any circumference you need.

 -Shay

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