v -10 -4.14615 -10
v -10 -4.14615  20
v  10 -4.14615  20
v  10 -4.14615  20
v  10 -4.14615 -10
v -10 -4.14615 -10
v -10 -10 -2
v  10 -10 -2
v  10  10 -2
v  10  10 -2
v -10  10 -2
v -10 -10 -2
v -10 5 -10
v -10 5  20
v  10 5  20
v  10 5  20
v  10 5 -10
v -10 5 -10
f 1 2 3
f 4 5 6
f 7 8 9
f 10 11 12
f 13 14 15
f 16 17 18