On 23 Sep 2003 10:24:30 -0400, "Rafal 'Raf256' Maj" <spa### [at] raf256com> wrote:

>
>Maybe union of sphere+cones would be faster?

I don't know what you mean. I can't visualise a helix made out of spheres and
cones :-{
 

Regards
        Stephen

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