1 2 3 4 5 6 7 8 9 10 11 12 13
v 0.5559 -0.4900 -0.9720 v 0.4441 -0.4900 -1.0279 v -0.5559 -0.4900 0.9720 v -0.4441 -0.4900 1.0279 vt 0 0 vt 0 1 vt 1 1 vt 1 0 vn 0 1 0 f 1/1/1 2/2/1 3/3/1 4/4/1