Thanks Maurice.  To be perfectly honest, I didn't know about isosurfaces and
f_spiral and f_helix1 before I embarked on using sphere_sweep.  I am about 4
months old on POVRay and sense I have lots of growing to do.

Neil

> A very nice CSG implementation of the f_spiral function. I like it
> because it gives more flexibility in making custom spirals. For example
> with varying frequency (revolutions per unit height).

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