o cube
mtllib cube.mtl

v -0.500000 -0.500000 0.500000
v 0.500000 -0.500000 0.500000
v -0.500000 0.500000 0.500000
v 0.500000 0.500000 0.500000
v -0.500000 0.500000 -0.500000
v 0.500000 0.500000 -0.500000
v -0.500000 -0.500000 -0.500000
v 0.500000 -0.500000 -0.500000

vt 0.000000 0.000000
vt 1.000000 0.000000
vt 0.000000 1.000000
vt 1.000000 1.000000

g cube
usemtl cube
s 1
f 1/1 2/2 3/3
f 3/3 2/2 4/4
s 2
f 3/1 4/2 5/3
f 5/3 4/2 6/4
s 3
f 5/4 6/3 7/2
f 7/2 6/3 8/1
s 4
f 7/1 8/2 1/3
f 1/3 8/2 2/4
s 5
f 2/1 8/2 4/3
f 4/3 8/2 6/4
s 6
f 7/1 1/2 5/3
f 5 1 3