collision layer an collision mask godot

Collision mask bit is for choosing what layer should be collided.</p> <p>Let’s assume we set collision layer and mask layer as below.</p> <p>Player node : collision layer is on 1st bit / mask layer is on 2nd,3rd bit<br /> Enemy node : collision layer is on 2nd bit / mask layer is on 1st bit<br /> Object node : collision layer is on 3rd bit / mask layer is on 1st bit</p> <p>then,<br /> Player mask(2) == Enemy layer(2)<br /> Player mask(3) == Object layer(3)<br /> so, Player can be collided with Enemy and Object.</p> <p>but Enemy nodes are not collided each other or Object nodes.<br /> Because Enemy mask(1) != Enemy layer(2) / Enemy mask(1) != Object layer(3)