c
2
1
4
-600 -200 -80  0 0 1
600 -200 -80  0 0 1
600 200 -80 0 0 1
-600 200 -80  0 0 1
1 0 0
1
4
-400 -400 -40  0 0 1
400 -400 -120  0 0 1
400 400 -120 0 0 1
-400 400 -40  0 0 1
0.5 0.5 0.5