v -0.499 -0.499 0.5
v -0.499 -0.499 -0.499
v 0.5 -0.499 -0.499
v 0.5 -0.499 0.5
v -0.499 0.5 0.5
v -0.499 0.5 -0.499
v 0.5 0.5 -0.499
v 0.5 0.5 0.5
vt 1 1
vt 0 1
vt 0 0
vt 1 0
g 1
s off
f 5/1 6/2 2/3 1/4
f 6/1 7/2 3/3 2/4
f 7/1 8/2 4/3 3/4
f 8/1 5/2 1/3 4/4
f 1/1 2/2 3/3 4/4
f 8/1 7/2 6/3 5/4