I saw this picture on the CNN site, thought it might help.

Kirk

"Gail Shaw" <gsh### [at] monotixcoza> wrote in message
news:3ac07177@news.povray.org...
> I decided I needed some atmospheric effects for my
> irtc entry (which I will post once it's more than a few cylinders
> and cones)
>
> This is supposed to be the aurora borealis.  It's an isosurface
> containing media with a function used in the density.
>
> For those who live far enough north to see the real thing, does
> it look right?
>
> For the iso experts, is there any way I can randomly vary the
> distance between the peaks of a sine wave?
>
> Comments? suggestions?
>
> Gail
> *************************************************************************
> * gsh### [at] monotixcoza                *   Step into the abyss,           *
> * http://www.rucus.ru.ac.za/~gail/   *   and let go.        Babylon 5   *
> *************************************************************************
> * The difficult we do immediately, the impossible takes a little longer *
> *************************************************************************
>
>
>

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