# test cube
v -4.0000000e+0 -4.0000000e+0 0.0000000e+0
v -4.0000000e+0 4.0000000e+0 0.0000000e+0
v 4.0000000e+0 4.0000000e+0 0.0000000e+0
v 4.0000000e+0 -4.0000000e+0 0.0000000e+0
vt 0.0000000e+0 0.0000000e+0
vt 0.0000000e+0 1.0000000e+0
vt 1.0000000e+0 1.0000000e+0
vt 1.0000000e+0 0.0000000e+0
vn 0.0000000e+0 0.0000000e+0 -1.0000000e+0
vn 1.0000000e+0 0.0000000e+0 0.0000000e+0
vn 0.0000000e+0 1.0000000e+0 1.0000000e+0
vn 1.0000000e+0 1.0000000e+0 1.0000000e+0
f 1/1/1 2/2/2 3/3/3 4/4/4