I'd be happy to submit this one, if you'd like to add a carved jade ball to
your collection.


It's just a 12-line isosurface based on the 'crackle' pattern.

===================================================
#declare cells_pigment = pigment {
  crackle color_map {[0.0 color rgb 1] [0.3 color rgb 0] [1.0 color rgb 0]}
}
#declare fun_pig = function { pigment {cells_pigment} }
#declare fun_val = function { fun_pig(x,y,z).red }
isosurface {
  function     { .95-fun_val(x,y,z)}
  contained_by { sphere { 0, 3 } }
  accuracy     0.1
  max_gradient 7
  texture {Jade finish {diffuse 1 specular .7 ambient .15}  }
}


===================================================

The intricate carved pattern comes from having a "too low" accuracy setting.

   Ron

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