Wasn't it Akuma who wrote:
>I've been trying to create a strand of DNA using an isosurface. However, I
>keep having trouble creating the double helix using the function f_helix1
>found in functions.inc
>
>Could anybody give me an example double helix for me to start with? It'd be
>a big help.

http://www.econym.demon.co.uk/isotut/builtin1.htm#helix1

The significant numbers for obtaining a double helix are the first
parameter after the x,y,z being 2 and the third parameter (minor radius)
being less than the fourth (major radius)

-- 
Mike Williams
Gentleman of Leisure

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