//Cayley's Ruled Cubic, a Type 9 Steiner surface
//by Adam Coffman

camera {
    location  <6,-0.5,-5>
    look_at   <0,0,0>
      }
 #include "colors.inc"
 background{White}
 poly { 3 <
    0,0,0,0,0,1,0,-1,0,0,1,0,0,0,0,0,0,-1,0,0>
    sturm 
    texture { 
    pigment {
    gradient x
    color_map {
        [0.00 rgb <1,0,0>]
        [0.33 rgbt <0,0,1,0.4>]
        [0.66 rgbt <0,1,0,0.35>]
            }
    scale 0.55
         }
    finish{ambient 0.5}
    }
    bounded_by { cylinder{<2.8,0,0> <-5.1,0,0> 1.9 }  }
    clipped_by { bounded_by }
    scale <1,1.5,1.7>
    rotate x*180               
   }          
  light_source{<0.5,80,0> White} 
  light_source{<-80,60,0.5> White}
  light_source{<80,0,0.5> White}
  light_source{<0,-40,-40> White}