<?xml version="1.0" encoding="UTF-8" ?>
<class name="VisibilityNotifier" inherits="CullInstance" version="3.8">
	<brief_description>
		Detects approximately when the node is visible on screen.
	</brief_description>
	<description>
		The VisibilityNotifier detects when it is visible on the screen. It also notifies when its bounding rectangle enters or exits the screen or a [Camera]'s view.
		If you want nodes to be disabled automatically when they exit the screen, use [VisibilityEnabler] instead.
		[b]Note:[/b] VisibilityNotifier uses an approximate heuristic for performance reasons. It doesn't take walls and other occlusion into account (unless you are using [Portal]s). The heuristic is an implementation detail and may change in future versions. If you need precise visibility checking, use another method such as adding an [Area] node as a child of a [Camera] node and/or [method Vector3.dot].
	</description>
	<tutorials>
	</tutorials>
	<methods>
		<method name="is_on_screen" qualifiers="const">
			<return type="bool" />
			<description>
				If [code]true[/code], the bounding box is on the screen.
				[b]Note:[/b] It takes one frame for the node's visibility to be assessed once added to the scene tree, so this method will return [code]false[/code] right after it is instantiated, even if it will be on screen in the draw pass.
			</description>
		</method>
	</methods>
	<members>
		<member name="aabb" type="AABB" setter="set_aabb" getter="get_aabb" default="AABB( -1, -1, -1, 2, 2, 2 )">
			The VisibilityNotifier's bounding box.
		</member>
		<member name="max_distance" type="float" setter="set_max_distance" getter="get_max_distance" default="0.0">
			In addition to checking whether a node is on screen or within a [Camera]'s view, VisibilityNotifier can also optionally check whether a node is within a specified maximum distance when using a [Camera] with perspective projection. This is useful for throttling the performance requirements of nodes that are far away.
			[b]Note:[/b] This feature will be disabled if set to 0.0.
		</member>
	</members>
	<signals>
		<signal name="camera_entered">
			<argument index="0" name="camera" type="Camera" />
			<description>
				Emitted when the VisibilityNotifier enters a [Camera]'s view.
			</description>
		</signal>
		<signal name="camera_exited">
			<argument index="0" name="camera" type="Camera" />
			<description>
				Emitted when the VisibilityNotifier exits a [Camera]'s view.
			</description>
		</signal>
		<signal name="screen_entered">
			<description>
				Emitted when the VisibilityNotifier enters the screen.
			</description>
		</signal>
		<signal name="screen_exited">
			<description>
				Emitted when the VisibilityNotifier exits the screen.
			</description>
		</signal>
	</signals>
	<constants>
	</constants>
</class>
