obj2gltf/specs/data/box-negative-indices/box-negative-indices.obj

# Blender v2.78 (sub 0) OBJ File: 'box.blend'
# www.blender.org
mtllib box-negative-indices.mtl
o Cube
v -1.000000 -1.000000 1.000000
v -1.000000 1.000000 1.000000
v -1.000000 -1.000000 -1.000000
v -1.000000 1.000000 -1.000000
v 1.000000 -1.000000 1.000000
v 1.000000 1.000000 1.000000
v 1.000000 -1.000000 -1.000000
usemtl Material
s off
f -7 -6 -4 -5
f -3 -2 -6 -7
f -5 -1 -3 -7
v 1.000000 1.000000 -1.000000
f -1 -5 -7 -3
f -6 -5 -1 -2
f -2 -1 -3 -4