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Ron Parker wrote in message <37ce9813@news.povray.org>...
>On Thu, 2 Sep 1999 17:06:21 +0200, Gail Shaw wrote:
>Try this:
>
>
>isosurface {
> function { "helix1" <2,1,0.2,1,1,1,0> }
> threshold 0
> max_gradient 20 method 2
> bounded_by {box {-10,10}}
> sign 1
> pigment {red 1} finish {ambient .4}
>}
>
>Most of the internal functions are designed to work with a threshold of
>zero. By default, they're bounded by a small box, so you need to add a
>bounding volume if you want to see anything interesting. I also added
>the max_gradient 20 method 2 to eliminate some gaps in the result.
>
>Finally, the docs for parameter 4 ("shape parameter") are useless, but
>a little playing shows that it is the ratio of height to width for the
>ellipses the "strands" are made out of. Zero is a bad number, and will
>in fact crash on some architectures. Replacing it with a one gives
>you a circular cross-section, which is what I assume you wanted. I'll
>try to remember to fix this in the next version of the docs.
Thanks, that's basically what I wanted.
Next question. Can I use the isosurface functions within media.
I seem to vaguely remember a discussion on that, can't remember when or
where
though
Thanks
Gail
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