mtllib plane.mtl
o Plane
v -1000 0 1000
v 1000 0 1000
v 1000 0 -1000
v -1000 0 -1000
vn 0.000000 1.000000 0.000000
vt 0 0
vt 1 0
vt 1 1
vt 0 1
usemtl Material.001
f 1/1/1 3/3/1 4/4/1
f 1/1/1 2/2/1 3/3/1