v 0.0 0.0 0.0
v 0.0 1.0 0.0
v 1.0 1.0 0.0

v 1.0 1.0 0.0
v 1.0 0.0 0.0
v 1.0 1.0 1.0

v 1.0 0.0 1.0
v 0.0 1.0 1.0
v 0.0 0.0 1.0

vt 0.0 1.0
vt 0.0 0.0
vt 1.0 0.0

vt 0.0 1.0
vt 1.0 0.0
vt 1.0 1.0

# south
f 1/1 2/2 3/3
f 1/4 4/5 5/6
# east
f 5/1 4/2 6/3
f 5/4 6/5 7/6
# north
f 7/1 6/2 8/3
f 7/4 8/5 9/6
# west
f 9/1 8/2 2/3
f 9/4 2/5 1/6
# top
f 2/1 8/2 6/3
f 2/4 6/5 4/6
# bottom
f 7/1 9/2 1/3
f 7/4 1/5 5/6