usemtl blank

v 0.000000 -1.000000 -1.000000
v 0.000000 -1.000000 1.000000
v 0.000000 1.000000 -1.000000
v 0.000000 1.000000 1.000000

vt 0.000000 0.000000
vt 1.000000 0.000000
vt 0.000000 1.000000
vt 1.000000 1.000000

vn 1.000000 0.000000 0.000000
vn 1.000000 0.000000 0.000000
vn 1.000000 0.000000 0.000000
vn 1.000000 0.000000 0.000000

g blank
usemtl blank

f 1/1/1 2/2/2 3/3/3
f 2/2/2 3/3/3 4/4/4