58 lines
2.8 KiB
XML
58 lines
2.8 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="VisibilityNotifier" inherits="CullInstance" version="3.6" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
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<brief_description>
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Detects approximately when the node is visible on screen.
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</brief_description>
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<description>
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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.
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If you want nodes to be disabled automatically when they exit the screen, use [VisibilityEnabler] instead.
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[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].
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="is_on_screen" qualifiers="const">
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<return type="bool" />
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<description>
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If [code]true[/code], the bounding box is on the screen.
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[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.
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</description>
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</method>
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</methods>
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<members>
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<member name="aabb" type="AABB" setter="set_aabb" getter="get_aabb" default="AABB( -1, -1, -1, 2, 2, 2 )">
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The VisibilityNotifier's bounding box.
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</member>
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<member name="max_distance" type="float" setter="set_max_distance" getter="get_max_distance" default="0.0">
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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.
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[b]Note:[/b] This feature will be disabled if set to 0.0.
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</member>
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</members>
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<signals>
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<signal name="camera_entered">
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<argument index="0" name="camera" type="Camera" />
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<description>
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Emitted when the VisibilityNotifier enters a [Camera]'s view.
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</description>
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</signal>
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<signal name="camera_exited">
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<argument index="0" name="camera" type="Camera" />
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<description>
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Emitted when the VisibilityNotifier exits a [Camera]'s view.
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</description>
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</signal>
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<signal name="screen_entered">
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<description>
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Emitted when the VisibilityNotifier enters the screen.
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</description>
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</signal>
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<signal name="screen_exited">
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<description>
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Emitted when the VisibilityNotifier exits the screen.
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</description>
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</signal>
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</signals>
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<constants>
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</constants>
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</class>
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