o Line

v 0 0 0 1 0 0
v 1 0 0 0 1 0
v 0 1 0 0 0 1
v 1 1 0 1 1 1

vt 0 0
vt 2 0
vt 0 2
vt 2 2

l 1/1 2/2 3/3 4/4 1/1