n 4
b 1     4     0
b 2     4     0
b 3     4     0
b 4     4     0
b 1     3     0
b 2     3     0
b 3     3     0
b 4     3     0
b 1     2     0
b 2     2     0
b 3     2     0
b 4     2     0
b 1     1     0
b 2     1     0
b 3     1     0
b 4     1     0
v 0 0 0
v 1 0 0
v 0 1 0
v 1 1 0
v 0.5 0.5 1
f 4 2 1
f 3 4 1
f 2 5 1
f 5 3 1
f 2 4 5
f 3 5 4