ref: b8dacd35abcede65c0cd415e5fd41b3f8f75d4f3 dir: /mdl/tribasis.obj/
mtllib basis.mtl v 0 0 0 v 1 0 0 v 0 1 0 v 0 0 1 usemtl x f 1 2 3 usemtl y f 1 3 4 usemtl z f 1 4 2