#include "shapesq.inc"
object{ Quartic_Paraboloid   // -----------------------------
        sturm
        texture{ pigment{ color White }  
                 finish { phong 1 }
               } // end of texture 
        rotate<-90,0,0>
        clipped_by {sphere { <0,0, 5>,7 }}

        rotate< 0, 0,0>
        scale 0.2
        translate <0,1,0>
 } // ----------------------------------------- end of object