mtllib invalid-file-aaa.mtl invalid-file-bbb.mtl mtllib-multiple-files-issue-112.mtl
o Test
v 1.864151 -1.219172 -5.532511
v 0.575869 -0.666304 5.896140
v 0.940448 1.000000 -1.971128
usemtl default
f 1 2 3