Base node for 2D collisionables. CollisionObject2D is the base class for 2D physics collisionables. They can hold any number of 2D collision shapes. Usually, they are edited by placing [CollisionShape2D] and/or [CollisionPolygon2D] nodes as children. Such nodes are for reference and not present outside the editor, so code should use the regular shape API. Creates new holder for the shapes. Argument is a [CollisionShape2D] node. It will return owner_id which usually you will want to save for later use. Return the RID of this object. Shape owner is a node which is holding concrete shape resources. This method will return an array which is holding an integer numbers that are representing unique ID of each owner. You can use those ids when you are using others shape_owner methods. Return whether this object is pickable. Set whether this object is pickable. A pickable object can detect the mouse pointer enter/leave it and, if the mouse is inside it, report input events. Will remove all the shapes associated with given owner. Will return a [Shape2D]. First argument owner_id is an integer that can be obtained from [method get_shape_owners]. Shape_id is a position of the shape inside owner; it's a value in range from 0 to [method shape_owner_get_shape_count]. Returns number of shapes to which given owner is associated to. Will return [Transform2D] of an owner node. Removes related shape from the owner. This event fires only once when the mouse pointer enters any shape of this object. This event fires only once when the mouse pointer exits all shapes of this object.