// linear prism in x-direction: from ... to ..., number of points (first = last)
prism { -1.00 ,1.00 , 4
        <-1.00, 0.00>, // first point
        < 1.00, 0.00>, 
        < 0.00, 1.50>,
        <-1.00, 0.00>  // last point = first point!!!
        rotate<-90,-90,0> //turns prism in x direction! Don't change this line!  

      texture { pigment{ color White} 
                finish { phong 1.0}
              } // end of texture

       scale <1.00, 1.00, 1.00>
       rotate<0,0,0> 
       translate<0.00, 0.00, 0.00> 
     } // end of prism --------------------------------------------------------