disc {
   <0, 0, 0>, <0, 1, -1>, 2, 1.5
   pigment { color rgb <0, 1, 0> }
}

sphere {
   <0, 0, 0>, 1
   pigment { color rgb <0, 1, 0> }
}

light_source { <20, 10, -50> color rgb <1, 1, 1> }

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