"Mike Williams" <mik### [at] nospamplease> wrote in message
news:lOg+MBA### [at] econymdemoncouk...

> Is this anything like what you ware attempting?
>
> #declare F_Helix=
>  function{f_helix1(x,y,z, 2, 20, 0.06, 0.04, 1, 1, 0)}
>
> isosurface {
>  function {F_Helix(f_r(x,y,z)-1, f_ph(x,y,z), z)}
>  max_gradient 10
>  contained_by {box {-1.5,1.5}}
>  pigment {rgb 1}
>  rotate y*45
> }

Perfect, Thank you.

I thought of polar, but didn't know about the functions for it.
Back to the docs...

Gail
--
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* gsh### [at] monotixcoza                *   Chaos, disorder and panic      *
* http://www.rucus.ru.ac.za/~gail/   *   My job here is done.           *
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* Just think of me as the storm before the calm     Magic: The Gathering*
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