Base node for 2D collision objects. CollisionObject2D is the base class for 2D physics objects. It can hold any number of 2D collision [Shape2D]s. Each shape must be assigned to a [i]shape owner[/i]. The CollisionObject2D can have any number of shape owners. Shape owners are not nodes and do not appear in the editor, but are accessible through code using the [code]shape_owner_*[/code] methods. [b]Note:[/b] Only collisions between objects within the same canvas ([Viewport] canvas or [CanvasLayer]) are supported. The behavior of collisions between objects in different canvases is undefined. Accepts unhandled [InputEvent]s. [param shape_idx] is the child index of the clicked [Shape2D]. Connect to the [code]input_event[/code] signal to easily pick up these events. [b]Note:[/b] [method _input_event] requires [member input_pickable] to be [code]true[/code] and at least one [member collision_layer] bit to be set. Creates a new shape owner for the given object. Returns [code]owner_id[/code] of the new owner for future reference. Returns whether or not the specified layer of the [member collision_layer] is enabled, given a [param layer_number] between 1 and 32. Returns whether or not the specified layer of the [member collision_mask] is enabled, given a [param layer_number] between 1 and 32. Returns the object's [RID]. Returns the [code]one_way_collision_margin[/code] of the shape owner identified by given [param owner_id]. Returns an [Array] of [code]owner_id[/code] identifiers. You can use these ids in other methods that take [code]owner_id[/code] as an argument. If [code]true[/code], the shape owner and its shapes are disabled. Returns [code]true[/code] if collisions for the shape owner originating from this [CollisionObject2D] will not be reported to collided with [CollisionObject2D]s. Removes the given shape owner. Based on [param value], enables or disables the specified layer in the [member collision_layer], given a [param layer_number] between 1 and 32. Based on [param value], enables or disables the specified layer in the [member collision_mask], given a [param layer_number] between 1 and 32. Returns the [code]owner_id[/code] of the given shape. Adds a [Shape2D] to the shape owner. Removes all shapes from the shape owner. Returns the parent object of the given shape owner. Returns the [Shape2D] with the given id from the given shape owner. Returns the number of shapes the given shape owner contains. Returns the child index of the [Shape2D] with the given id from the given shape owner. Returns the shape owner's [Transform2D]. Removes a shape from the given shape owner. If [code]true[/code], disables the given shape owner. If [param enable] is [code]true[/code], collisions for the shape owner originating from this [CollisionObject2D] will not be reported to collided with [CollisionObject2D]s. Sets the [code]one_way_collision_margin[/code] of the shape owner identified by given [param owner_id] to [param margin] pixels. Sets the [Transform2D] of the given shape owner. The physics layers this CollisionObject2D is in. Collision objects can exist in one or more of 32 different layers. See also [member collision_mask]. [b]Note:[/b] Object A can detect a contact with object B only if object B is in any of the layers that object A scans. See [url=$DOCS_URL/tutorials/physics/physics_introduction.html#collision-layers-and-masks]Collision layers and masks[/url] in the documentation for more information. The physics layers this CollisionObject2D scans. Collision objects can scan one or more of 32 different layers. See also [member collision_layer]. [b]Note:[/b] Object A can detect a contact with object B only if object B is in any of the layers that object A scans. See [url=$DOCS_URL/tutorials/physics/physics_introduction.html#collision-layers-and-masks]Collision layers and masks[/url] in the documentation for more information. Defines the behavior in physics when [member Node.process_mode] is set to [constant Node.PROCESS_MODE_DISABLED]. See [enum DisableMode] for more details about the different modes. If [code]true[/code], this object is pickable. A pickable object can detect the mouse pointer entering/leaving, and if the mouse is inside it, report input events. Requires at least one [member collision_layer] bit to be set. Emitted when an input event occurs. Requires [member input_pickable] to be [code]true[/code] and at least one [member collision_layer] bit to be set. See [method _input_event] for details. Emitted when the mouse pointer enters any of this object's shapes. Requires [member input_pickable] to be [code]true[/code] and at least one [member collision_layer] bit to be set. Note that moving between different shapes within a single [CollisionObject2D] won't cause this signal to be emitted. [b]Note:[/b] Due to the lack of continuous collision detection, this signal may not be emitted in the expected order if the mouse moves fast enough and the [CollisionObject2D]'s area is small. This signal may also not be emitted if another [CollisionObject2D] is overlapping the [CollisionObject2D] in question. Emitted when the mouse pointer exits all this object's shapes. Requires [member input_pickable] to be [code]true[/code] and at least one [member collision_layer] bit to be set. Note that moving between different shapes within a single [CollisionObject2D] won't cause this signal to be emitted. [b]Note:[/b] Due to the lack of continuous collision detection, this signal may not be emitted in the expected order if the mouse moves fast enough and the [CollisionObject2D]'s area is small. This signal may also not be emitted if another [CollisionObject2D] is overlapping the [CollisionObject2D] in question. Emitted when the mouse pointer enters any of this object's shapes or moves from one shape to another. [param shape_idx] is the child index of the newly entered [Shape2D]. Requires [member input_pickable] to be [code]true[/code] and at least one [member collision_layer] bit to be set. Emitted when the mouse pointer exits any of this object's shapes. [param shape_idx] is the child index of the exited [Shape2D]. Requires [member input_pickable] to be [code]true[/code] and at least one [member collision_layer] bit to be set. When [member Node.process_mode] is set to [constant Node.PROCESS_MODE_DISABLED], remove from the physics simulation to stop all physics interactions with this [CollisionObject2D]. Automatically re-added to the physics simulation when the [Node] is processed again. When [member Node.process_mode] is set to [constant Node.PROCESS_MODE_DISABLED], make the body static. Doesn't affect [Area2D]. [PhysicsBody2D] can't be affected by forces or other bodies while static. Automatically set [PhysicsBody2D] back to its original mode when the [Node] is processed again. When [member Node.process_mode] is set to [constant Node.PROCESS_MODE_DISABLED], do not affect the physics simulation.