Base class for all objects affected by physics in 2D space. PhysicsBody2D is an abstract base class for implementing a physics body. All *Body2D types inherit from it. http://docs.godotengine.org/en/3.0/tutorials/physics/physics_introduction.html Adds a body to the list of bodies that this body can't collide with. Returns an individual bit on the collision mask. Returns an individual bit on the collision mask. Removes a body from the list of bodies that this body can't collide with. Sets individual bits on the layer mask. Use this if you only need to change one layer's value. Sets individual bits on the collision mask. Use this if you only need to change one layer's value. The physics layers this area is in. Collidable objects can exist in any of 32 different layers. These layers work like a tagging system, and are not visual. A collidable can use these layers to select with which objects it can collide, using the collision_mask property. A contact is detected if object A is in any of the layers that object B scans, or object B is in any layer scanned by object A. The physics layers this area scans for collisions. Both [member collision_layer] and [member collision_mask]. Returns [member collision_layer] when accessed. Updates [member collision_layer] and [member collision_mask] when modified.