intersection{

 box {<-2.5,-2.0,-2.5>,<2.5, 2.00,2.5>}
 object{ Hyperboloid_Y }
   
 texture { pigment{ color rgb<1.0, 1.0, 0.0> }
           finish { phong 0.1}
         }
 scale <1,1,1>*0.5 rotate<0,0,0> translate<0,0.00,0.0>
 } // end of intersection  -----------------------------