Marc wrote:

> 46876f2e@news.povray.org...
>> kurtz le pirate <kur### [at] yahoofr> wrote:
>>> adding some things like translate rand(alea) in the pigment function
>>> work as i want.
>>  Another possibility, which I think few actually know, is to do something
>> like this:
>>
>> #declare IsoFunc =
>>  function(x, y, z, a, b, c)
>>  { max((y*y-1),(x*x-1),(z*z-1)) - pigmentFn(x+a,y+b,z+c).gray*0.75 };
>>
>> isosurface { function { IsoFunc(x, y, z, 1, 2, 3) } }
>>
>> -- 
>>                                                          - Warp
> 
> Yes and you can as well  scale the function output by multiplying x,y,and z 
> (the bigger the multiplier, the smaller the scale)
> 
> Marc 
> 
>
Now for multiple random copies of the object

#declare nSeed = seed(400);
#macro IsoRand(Range,Scale)
   // Range and Scale are 3D vectors
   #local rgX = (random(nSeed)-random(nSeed))*Range.x;
   #local rgY = (random(nSeed)-random(nSeed))*Range.y;
   #local rgZ = (random(nSeed)-random(nSeed))*Range.z;
   isosurface {
     function {
       IsoFunc(x/Scale.x, y/Scale.y, z/Scale.z, rgX, rgY, rgZ)
     }
   }
#end

I've been doing something like this for a project of my own.
-- 
--------------
David Wallace
TenArbor Consulting
"Just In Time Cash"
www.tenarbor.com
1-866-572-CASH

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