ref: 75bd079a2d720e5c816451f7529b79bb29c33d7c dir: /mdl/quad.obj/
v -100 -100 0 v 100 -100 0 v -100 100 0 v 100 100 0 vt 0 0 vt 1 0 vt 0 1 vt 1 1 f 1/1 2/2 3/3 f 4/4 3/3 2/2