mtllib cube.mtl

usemtl cubemtl

v -0.5 -0.5 -0.5
v -0.5 -0.5  0.5
v -0.5  0.5 -0.5
v -0.5  0.5  0.5
v  0.5 -0.5 -0.5
v  0.5 -0.5  0.5
v  0.5  0.5 -0.5
v  0.5  0.5  0.5

vt 0.0 0.0
vt 0.0 1.0
vt 1.0 0.0
vt 1.0 1.0

f 1/1 2/3 4/4 3/2
f 2/1 6/3 8/4 4/2
f 6/1 5/3 7/4 8/2
f 5/1 1/3 3/4 7/2
f 4/1 8/3 7/4 3/2
f 2/1 1/3 5/4 6/2