#version 3.7;

global_settings {
   assumed_gamma 1.0
}

camera {
   location -20 * z
   look_at 0
}

light_source {
   -8 * z
   colour rgb 1
}

background {
   colour rgb 1
}

box {
   <-10, -10, 0.1>, <10, 10, 0.1>
   pigment { rgb 1 }
}
difference {
   box { <-10, -10, 0>, <10, 10, 0> }

#for (i, -10, 10)
#for (j, -10, 10)
   sphere { <i, j, 0>, 0.3 }
#end
#end

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