v 1.1 1.3 -1.2
v 3.1 3.3 -3.2
v 4.1 4.3 -4.2
vt 4.4 4.5
vt 3.4 3.5
vt 1.4 1.5
vt 0.1 0.2
f 1/3 2/2 3/1
