FYI follow-up.

So I was checking out Sam Benge's  code for outlining an object, and was
wondering if he could use f_th, f_ph, and f_r, and wouldn't you know it -
POV-Ray has an inbuilt function for making "tubes" from polynomials:
f_polytubes.  The threshold of the isosurface functions as the thickness
parameter for the tubes.

I'd say that in future versions, the function needs to be updated, a note
provided in the documentation about the non-circularity of the "tube", or some
other improvement to the general state of affairs.

- BW

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