o Triangle
v -0.5 -0.5 0.0
v 0.5 -0.5 0.0
v -0.5 0.5 0.0
vt 0 0
vt 1 0
vt 0 1
vn 0 0 1
s off
f 1/1/1 2/2/1 3/3/1