bicubic_patch {
   type 1
   u_steps 3
   v_steps 3
   <0, 0, 0>, <1, 0, 0>, <2, 0, 0>, <3, 0, 0>,
   <0, 0, 1>, <1, 6, 1>, <2, -6, 1>, <3, 0, 1>,
   <0, 0, 2>, <1, -6, 2>, <2, 6, 2>, <3, 0, 2>,
   <0, 0, 3>, <1, 0, 3>, <2, 0, 3>, <3, 0, 3>

   pigment { color rgb <1, 0.4, 0.4> }
}

light_source { <-1.5, 5, 1.5> color rgb <1, 1, 1> }

camera {
   location <2, 3, -3>
   look_at <1.5, 0, 1.5>
}