coven/modules/ufbx/data/synthetic_face_groups_0_obj.obj

v -1 -1 -1
v +1 -1 -1
v -1 +1 -1
v +1 +1 -1
v -1 -1 +1
v +1 -1 +1
v -1 +1 +1
v +1 +1 +1

usemtl A
o Cube
f 3 4 8 7
g Front
f 1 2 4 3
g Sides
f 1 3 7 5
usemtl B
g Back
f 5 6 8 7
g Sides
f 2 4 8 6
g 
f 1 2 6 5