isosurface { //-------------------------------------------------------------
  function { y }

  threshold 0
  contained_by {box {<-1,-1,-1>, < 1, 1, 1>}}
  open
  texture {
            pigment{ color rgb<1,1.0,0.95>*1.1}
            finish { phong 1}
	  }
  scale 1.0
  rotate <-32, 25, 0>
  translate <0, 1.2, 0>
} // end of isosurface -----------------------------------------------------