Is there any way to regionally control the values chosen in the {crackle 
solid} pattern?

What I want to do is control an isosurface that is based on crackle, by 
modulating it by something like
{ crackle solid colour_map { [.5 rgb 0][.5 rgb 1] } }
So that each individual "object" in my isosurface either exists or doesnt.

The problem is, crackle solid is totally random, so I can't influence it to 
create a region of my objects.

By way of a specific example: I've made a popcorn isosurface, where each 
popcorn kernel is based on a lump in the crackle pattern. Normally to 
localise an effect like this I'd just ramp it down towards the edge, but 
this makes it look like the popcorn's shrinking and it doesn't make sense to 
have small levitating peices of popcorn floating at the top of a bucket 
full.

So what I want to do is have a crackle solid pattern where I can make it so 
all the solid crackle cells above a certain height are black, or something 
like that.

The only way I can see to do it is to write my own very lengthy version of 
the crackle pattern as a function and then create the corresponding solid 
pattern with the extra control that I desire. But can anyone see a better 
way to do it?

-- 
Tek
http://evilsuperbrain.com

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