#declare F = function {"PH"}
           
                   
      isosurface {
             function { F(x,y,z) }
             threshold .5
             accuracy 0.001
             max_gradient 10
            contained_by {sphere  {0,1}}
            texture{pigment{rgb <1,.2,.1>}}
            scale 3
           }                    
-- 
Martial

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