newmtl floor
Ka  0.5 0.5 0.5 
Kd  0.4 0.4 0.4
Ks  0 0 0 
d  1

newmtl ceiling
Ka  0.5 0.5 0.5 
Kd  0.4 0.4 0.4
Ks  0 0 0 
d  1

newmtl back
Ka  0.5 0.5 0.5 
Kd  0.4 0.4 0.4
Ks  0 0 0 
d  1

newmtl green
Ka  0 0.5 0
Kd  0 0.5 0
Ks  0 0 0
d  1

newmtl red
Ka  0.5 0 0
Kd  0.5 0 0
Ks  0.5 0 0
d  1

newmtl short_box
Ka  0.6 0.6 0.6
Kd  0.5 0.5 0.5
Ks  0 0 0
d  1

newmtl tall_box
Ka  0.6 0.6 0.6
Kd  0.5 0.5 0.5
Ks  0 0 0
d  1

# these values are only approximations
# details at: http://www.graphics.cornell.edu/online/box/
#
# units are watts/nm^2
newmtl light
Ka  0 0 0
Kd  18.9914 14.4266 3.8927
Ks  0.78 0.78 0.78