camera {location <0,2,-4>
        look_at  <0,0.5,0>}


light_source {<0,10,-4> rgb <1,1,1>}

cylinder  // right cylinder
{ 0,0.999*y,1
  pigment
  { gradient y color_map
    { [0 rgbf  <1,0,0,0>]
      [1 rgbf  <1,0,0,1>]
    }
  }
translate <1.2,0,0>
}



cylinder  // left cylinder
{ 0,0.999*y,1
//open
  pigment
  { gradient y color_map
    { [0 rgbt  <1,0,0,1>]
      [1 rgbt  <1,0,0,0>]
    }
  }
translate <-1.2,0,0>
}

plane {y,-1 pigment{ rgb 1}}