#include "colors.inc" camera { location <-3, 10, 5> look_at <5, 5, 0> } plane { y, 0 pigment { checker color Black color White } } light_source { <-5, 10, 4> color White } light_source { <-3, 10, 5> color White } difference { box { <0, 0, 0>, <10, 10, 1> } box { <2, 0, -1>, <6, 8, 2> } pigment { color Red } }