# done myself
v 100.0 -100.0 0.0
v 100.0 100.0 0.0
v -100.0 100.0 0.0
v -100.0 -100.0 0.0

vt 0.0 0.0
vt 100.0 0.0
vt 100.0 100.0
vt 0.0 100.0

vn  0.000000  0.000000 1.000000

usemtl grass.png

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