global_settings{assumed_gamma 1}

light_source{<0,20,-0> rgb 1}

plane{y,0 pigment{rgb x transmit .5}}

camera{
  location <0,3,-6> // Effect #1 = Change y to get different results
  look_at <0,1,0>
}

mesh{
  triangle{<-2,12,0>,<2,12,0>,<2,0,0>}
  triangle{<-2,12,0>,<2,0,0>,<-2,0,0>}
  pigment{rgbt <0,0,1,.8>}
  interior{ior 1.1} // Effect #2 = change value to get different results
}

intersection{
disc{y*.01,y,1 
  pigment{spherical color_map{[0 rgbt <0,0,0,1>][1 rgb 1]}}
  scale 12
  }
plane{x,0}
}

sphere{<0,0,12>,3 pigment{rgb y}}