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

v 0.0 0.0 -1.0
v 1.0 0.0 -1.0
v 0.0 1.0 -1.0
v 1.0 1.0 -1.0

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

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