Wasn't it Woody who wrote:
>Is there anyway to change how a gradient density fades off?
>
>The following scene has a density that's a linear gradient. That is it 
>falls off
>in a linear fashion. Is there any way to change this so the density falls off
>say at a geometric or exponential rate? Maybe instead of a linear decreasing
>density, something where the density is sinosoidal?

You can use a function as the density pattern, like this:

http://www.econym.demon.co.uk/isotut/patterns.htm#density

-- 
Mike Williams
Gentleman of Leisure

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