>Ooo sweet! Why don't you try to add a cloudy layer too?

Thanks.  
Well, it's easy to add a cloudy layer but I would like to 
demonstrate the isosurface capablility in that image.

>And I like that gold!

The POV code of the gold is following (the texture is
'T_Gold_3E'). 

object{
  union{
    isosurface {
        function {
          f_mesh1(atan2(x,z)/pi*2,f_r(x,0,z)-0.4*(y*y+1),
                   y, 0.1, 0.1, 0.25, 0.005, 1) 
        }
        contained_by { box { <-0.6,-0.6,-0.6>, <0.6,0.2,0.6> } } 
        threshold 0.0075 
        accuracy 0.0005  
        max_gradient 1.2 
    } 
    torus{  0.2*0.2*0.4+0.4, 0.03   translate y*0.2}
    torus{  0.6*0.6*0.4+0.4, 0.03   translate y*-0.6}
  }
}

R. Suzuki

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