Hmm.. it's the non-overlapping part that's hard.
Perhaps something like:
texture
{
    spherical 
    texture_map
    {
        [0 bigCrackle]
        [0.3 bigCrackle]
        [.30001 smallCrackle]
        [1 smallCrackle]
    }
}

I doubt it will work, but it's worth a try.
______
David McCabe
mcc### [at] yahoocom
http://homepage.mac.com/davidmccabe/
Jesus loves you! 


> I've been using crackle to make randomly placed armor plates, but I also
> need to have one plate in a specific location, and have it not overlap
> any of the random plates.  What I'd like to do is something like this:
> 
> #macro my_pattern (V)
> max( crackle (V), spherical (V) )
> #end
> 
> #declare my_texture = texture{ my_pattern texture_map{...}}

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