ref: 6cc69736507a41b005802bafef4fb75a8c5ba24b dir: /mdl/basis.obj/
mtllib basis.mtl v 0 0 0 v 1 0 0 v 0 1 0 v 0 0 1 usemtl x l 1 2 usemtl y l 1 3 usemtl z l 1 4