imsize 640 480
eye 0 0 -2
viewdir 0 0 -1
hfov 90
updir 0 1 0
bkgcolor 0.4 0.4 0.4

light -5 5 -7.5 1 1 1 1
light 5 5 -7.5 1 1 1 1

mtlcolor 0.4 0.6 1 1 1 1 0.2 0.6 0 10
sphere 0 -2 -10 2

mtlcolor 0.8 0.4 0.4 1 1 1 0.2 0.6 0 10
sphere -2.5 2.5 -10 1
sphere 2.5 2.5 -10 1