Wasn't it Renderdog who wrote:

>There is an isosurface called the Helical Torus that does
>what you're looking for. Some info on the parameters
>are available at this (very excellent!) resource provided
>by Mike Williams:
>
>http://www.econym.demon.co.uk/isotut/nfunc2.htm#ht

I actually had no idea that the helical torus could be used to create a
circular helix. When I was developing that tutorial I experimented with
lots of different values but never happened to stumble on a set that
worked that way.

-- 
Mike Williams
Gentleman of Leisure

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