cube2.obj

mtllib cube.mtl 

# vertex indexes start at 1
#
#      (3)------(7)
#      /|       /|
#     / |      / |
#   (4)------(8) |
#    |  |     |  |
#    | (1)----|-(5)
#    | /      | /
#    |/       |/
#   (2)------(6)

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

vn 0.0 0.0 1.0
vn 0.0 0.0 -1.0
vn 0.0 1.0 0.0
vn 0.0 -1.0 0.0
vn 1.0 0.0 0.0
vn -1.0 0.0 0.0

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

g cube
usemtl face1
f 1/4/2 7/2/2 5/3/2
f 1/4/2 3/1/2 7/2/2
usemtl face2 
f 1/1/6 4/3/6 3/4/6 
f 1/1/6 2/2/6 4/3/6
usemtl face3
f 3/1/3 8/3/3 7/4/3 
f 3/1/3 4/2/3 8/3/3
usemtl face4
f 5/2/5 7/3/5 8/4/5 
f 5/2/5 8/4/5 6/1/5
usemtl face5
f 1/1/4 5/2/4 6/3/4 
f 1/1/4 6/3/4 2/4/4
usemtl face6
f 4/1/1 2/4/1 8/2/1  6/3/1