mtllib brick
usemtl brick

v -1 -1 0
v 1 -1 0
v -1 1 0
v 1 1 0

vt 0 1
vt 1 1
vt 1 0
vt 0 0

vn 0 0 1
vn 0 0 1
vn 0 0 1
vn 0 0 1

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