Gail Shaw wrote:
> 
> 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?

I don't know first hand, but i think you should vary the coloring.  

> 
> For the iso experts, is there any way I can randomly vary the
> distance between the peaks of a sine wave?
> 

Well then it is no more a sine wave :-)

You could for example use a pigment function with a gradient pigment to
have full control over the shape.  

You could also try a superposition of several sine waves scaled and
translated, but that would be mainly trial and error.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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