sphere_sweep {
    linear_spline
    4,
    <-0.50, 1.00, 0>, 0.25
    <-0.50, 0.00, 0>, 0.15
    < 0.50, 0.00, 0>, 0.25
    < 0.50, 1.00, 0>, 0.15

    texture{ pigment{ color rgb<1,0.15,0.00>}
             finish { phong 1 }
           } // end of texture
    
    scale<1,1,1>   rotate<0,0,0>  translate<0,0.5,0>  
   }  // end of sphere_sweep ----------------------------