mtllib shadow.mtl
o shadow.obj
v -0.500000 0.000000 -0.500000
v 0.500000 0.000000 -0.500000
v -0.500000 0.000000 0.500000
v 0.500000 0.000000 0.500000
vn 0.000000 1.000000 0.000000
vn 0.000000 1.000000 0.000000
vn 0.000000 1.000000 0.000000
vn 0.000000 1.000000 0.000000
vt 0.004950 0.004950
vt 0.995049 0.004950
vt 0.995049 0.995049
vt 0.004950 0.995049
g Generic
usemtl Default
f 3/1/3 4/2/4 2/3/2 1/4/1