# octahedron: 6 vertices, 12 edges, 8 faces
v 1 0 0
v -1 0 0
v 0 1 0
v 0 -1 0
v 0 0 1
v 0 0 -1
f 5 2 4
f 5 4 1
f 5 1 3
f 5 3 2
f 6 1 4
f 6 4 2
f 6 2 3
f 6 3 1