mtllib issue-177.mtl

v 0.000000 2.000000 2.000000
v 0.000000 0.000000 2.000000
v 2.000000 0.000000 2.000000
v 2.000000 2.000000 2.000000
v 0.000000 2.000000 0.000000
v 0.000000 0.000000 0.000000
v 2.000000 0.000000 0.000000
v 2.000000 2.000000 0.000000
# 8 vertices

g front cube
usemtl white
f 1 2 3 4
g back cube
# expects white material
f 8 7 6 5
g right cube
usemtl red
f 4 3 7 8
g top cube
usemtl white
f 5 1 4 8
g left cube
usemtl green
f 5 6 2 1
g bottom cube
usemtl white
f 2 6 7 3
# 6 elements