light 9 -4.0 10.0  0.7
light -10 2.0 15.0  0.3

material 3

sphere 0.65 -0.6 0.4 0.2
sphere -0.6 0.75 0.4 0.4
sphere -0.5 0.15 0.2 0.2

ply_file ../scenes/plateau.ply
ply_file ../scenes/kubus.ply
ply_file ../scenes/tetra.ply

