3DG1
8
-20 50 -20
30 50 -20
30 0 -20
-20 0 -20
-20 0 20
30 0 20
30 50 20
-20 50 20
4 0 1 2 3 0
4 4 5 6 7 0
4 1 6 5 2 0
4 3 4 7 0 0
4 7 6 1 0 0
