g cube
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  1.0  1.0  1.0
vt  2.0  2.0  2.0
vt  3.0  3.0  3.0
vt  4.0  4.0  4.0
vt  5.0  5.0  5.0
vt  6.0  6.0  6.0
vt  7.0  7.0  7.0
vt  8.0  8.0  8.0
vt  9.0  9.0  9.0
vt  10.0  10.0  10.0
vt  11.0  11.0  11.0
vt  12.0  12.0  12.0
f  1/1/2  7/1/2  5/1/2
f  1/2/2  3/2/2  7/2/2 
f  1/3/6  4/3/6  3/3/6 
f  1/4/6  2/4/6  4/4/6 
f  3/5/3  8/5/3  7/5/3 
f  3/6/3  4/6/3  8/6/3 
f  5/7/5  7/7/5  8/7/5 
f  5/8/5  8/8/5  6/8/5 
f  1/9/4  5/9/4  6/9/4 
f  1/10/4  6/10/4  2/10/4 
f  2/11/1  6/11/1  8/11/1 
f  2/12/1  8/12/1  4/12/1