v -1 -1 -1
v  1 -1 -1
v  1 -1  1
v -1 -1  1

vt 0 0
vt 1 0
vt 1 1
vt 0 1

vn 0 1 0

f 3/3/1 2/2/1 1/1/1
f 4/4/1 3/3/1 1/1/1