> For those interested, there is similar macro in isocsg library for making
such
> isosurface for further displacements. Here is a link to the manual:
> http://www-public.tu-bs.de/~y0013390/pov/ic/docu02.html#Shaped_Torus

Not similar at all, the extrusion is not along a circle, but along a path
cycling around a torus, and it is only as a sample of a more general macro.

> IC_Shaped_Torus_Spline() is also under development (but delayed 'a
little')
>
http://news.povray.org/povray.binaries.animations/32078/227007/isotorspline.mpg

This one may be quite similar

pgb

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