I was messing around with some multifractals and came up with this. It's 
based on a crackle form <1,0,0> repeated like a perlin multi-fractal over 8 
octaves. The heightfield renders pretty quick (19 minutes) but the isosurfae 
took an amazing 9 hours!

Here's the code for the pattern, the Curve value adjusts how the holes look. 
Have a look at p.b.a to see what happens when I animate that value!:

pigment {
 #local Curve=1/8; // small values make it look porous
 #local Omega=0.5;
 #local Lambda=2;
 #local Octaves=8;
 pigment_pattern {
  average
  pigment_map {
   #local octave=0;
   #while ( octave < Octaves )
    [pow(Omega,octave)
     pigment_pattern {
      crackle form <.9,0,0>
      scale pow(Lambda,-octave)
      colour_map {[0 rgb 1][1 rgb 0]}
     }
     poly_wave 1/Curve
    ]
    #local octave=octave+1;
   #end
  }
 }
 poly_wave Curve
 colour_map {[0 rgb 1][1 rgb 0]}
}


-- 
Tek
http://evilsuperbrain.com

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