mtllib plane.mtl
o Plane
v -1.000000 0.000000 1.000000
v 1.000000 0.000000 1.000000
v -1.000000 0.000000 -1.000000
v 1.000000 0.000000 -1.000000
vt 0.000000 0.000000
vt 1.000000 0.000000
vt 1.000000 1.000000
vt 0.000000 1.000000
vn 0.0000 1.0000 0.0000
usemtl None
s off
f 1/1/1 2/2/1 4/3/1 3/4/1