Wasn't it Rune who wrote:

>Can anyone guess the trick I used?

If it's that fast it must just be a texture (either that or your
machine's a lot faster than mine). I'd guess something like this:

  pigment {leopard
    scale <0.01,1,0.1>
    turbulence <4,1,1> octaves 2 omega 1
    colour_map{[0 rgb 0][0.1 rgb <0,0.5,0>][0.5 rgb <0.9,1,0.9>]}  
    warp {turbulence <0.2,0.1,0.1>}
  }
-- 
Mike Williams
Gentleman of Leisure

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