I will give it a try, but I'm not sure of the final effect once on the 
shelf.

Nico

Ron Mayer wrote:
> 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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