intersection { 
 box {<-2,-2.5,0>,<2.5,2.5, 4.00>}
 object{ Paraboloid_Z}  
         texture{ pigment{ color rgb<1, 0.05, 0.2> }
                  finish { phong 1}
                }
        scale <1,1,1>*0.5 rotate<0,0,0> translate<0,0.00,0.0>
       } // end of object ----------------------------------