ref: b7c3f36539569f5861b259b136ba2f9f14ae9e78
dir: /mdl/primtest.obj/
mtllib basis.mtl v 0 0 0 v 1 0 0 v 0 1 0 v 0 0 1 v 2 0 0 v 0 2 0 v 0 0 2 v 2.1 0 0 v 0 2.1 0 v 0 0 2.1 usemtl x f 1 2 3 l 1 5 p 8 usemtl y f 1 3 4 l 1 6 p 9 usemtl z f 1 4 2 l 1 7 p 10