isosurface { //-------------------------------------------------------------

  function{ f_pillow( x,y,z, 0.26 ) // field strength
          }          

  contained_by {box {<-1,-1,-1>*1.5,<1,1,1>*1.5}}
  threshold 0
  max_gradient 18
  
  texture{ 
     pigment{ color rgb <0.9,0.45,0.7>} 
     //normal { bumps 0.15 scale 0.015}
     finish { specular 0.2 phong 0.7 }
         }
  rotate<0,25,0>
  scale 0.7
  translate< 0,1.15,0>
} // end of isosurface -------------------------------------------------------