v 1 2 3
v 4 5 6
v 7 8 9
v 1 2 3 1 0 0
v 4 5 6 0 1 0
v 7 8 9 0 0 1
vt 0 0
vt 1 0
vt 1 1
vn 1 0 0
vn 0 1 0
vn 0 0 1

g Mesh
f 1 2 3
f 1/1 2/2 3/3
f 1//1 2//2 3//3
f 1/1/1 2/2/2 3/3/3
f 4 5 6
f 4/1 5/2 6/3
f 4//1 5//2 6//3
f 4/1/1 5/2/2 6/3/3
f 0 100 -100
f /1 100/2 -100/3
f //1 100//2 -100//3
f /1/1 100/2/2 -100/3/3