v -1.0 0.0 1.0
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v -1.0 1.0 -1.0
v 1.0 1.0 -1.0
v -1.0 0.0 -1.0
v 1.0 0.0 -1.0
v 0.0 2.0 0.0
f 1 2 4 3
f 5 6 8 7
f 7 8 2 1
f 2 8 6 4
f 7 1 3 5
f 3 4 9
f 4 6 9
f 6 5 9
f 5 3 9