1 2 3 4 5 6 7 8 9 10
v -100 -100 0 v 100 -100 0 v -100 100 0 v 100 100 0 vt 0 0 vt 1 0 vt 0 1 vt 1 1 f 1/1 2/2 3/3 f 4/4 3/3 2/2