o simple12
mtllib simple.mtl

v -100 800  100
v  100 800  100
v -100   0  100
v  100   0  100
v -100 800 -100
v  100 800 -100
v -100   0 -100
v  100   0 -100

vt 0.53125 0.03125
vt 0.28125 0.84375
vt 0.96875 0.40625

vt 0.03125 0.09375
vt 0.15625 0.21875
vt 0.28125 0.34375
vt 0.40625 0.46875
vt 0.53125 0.59375
vt 0.65625 0.71875
vt 0.78125 0.84375
vt 0.90625 0.96875

vt 0.84375 0.03125

vn 1 0 0
vn -1 0 0
vn 0 1 0
vn 0 -1 0
vn 0 0 1
vn 0 0 -1

usemtl main

f 1/10/5 3/10/5 2/10/5
f 2/10/5 3/10/5 4/10/5

f 5/12/3 1/12/3 6/12/3
f 6/12/3 1/12/3 2/12/3

f 5/4/4 7/4/4 6/4/4
f 6/4/4 7/4/4 8/4/4