41 lines
3.1 KiB
XML
41 lines
3.1 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Portal" inherits="Spatial" version="3.4">
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<brief_description>
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Portal nodes are used to enable visibility between [Room]s.
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</brief_description>
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<description>
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[Portal]s are a special type of [MeshInstance] that allow the portal culling system to 'see' from one room to the next. They often correspond to doors and windows in level geometry. By only allowing [Camera]s to see through portals, this allows the system to cull out all the objects in rooms that cannot be seen through portals. This is a form of [b]occlusion culling[/b], and can greatly increase performance.
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There are some limitations to the form of portals:
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They must be single sided convex polygons, and usually you would orientate their front faces [b]outward[/b] from the [Room] they are placed in. The vertices should be positioned on a single plane (although their positioning does not have to be perfect).
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There is no need to place an opposite portal in an adjacent room, links are made two-way automatically.
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</description>
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<tutorials>
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</tutorials>
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<methods>
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</methods>
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<members>
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<member name="linked_room" type="NodePath" setter="set_linked_room" getter="get_linked_room" default="NodePath("")">
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This is a shortcut for setting the linked [Room] in the name of the [Portal] (the name is used during conversion).
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</member>
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<member name="points" type="PoolVector2Array" setter="set_points" getter="get_points" default="PoolVector2Array( 1, -1, 1, 1, -1, 1, -1, -1 )">
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The points defining the shape of the [Portal] polygon (which should be convex).
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These are defined in 2D, with [code]0,0[/code] being the origin of the [Portal] node's [code]global_transform[/code].
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[code]Note:[/code] These raw points are sanitized for winding order internally.
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</member>
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<member name="portal_active" type="bool" setter="set_portal_active" getter="get_portal_active" default="true">
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Visibility through [Portal]s can be turned on and off at runtime - this is useful for having closable doors.
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</member>
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<member name="portal_margin" type="float" setter="set_portal_margin" getter="get_portal_margin" default="1.0">
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Some objects are so big that they may be present in more than one [Room] ('sprawling'). As we often don't want objects that *just* breach the edges to be assigned to neighbouring rooms, you can assign an extra margin through the [Portal] to allow objects to breach without sprawling.
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</member>
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<member name="two_way" type="bool" setter="set_two_way" getter="is_two_way" default="true">
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Portals default to being two way - see through in both directions, however you can make them one way, visible from the source room only.
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</member>
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<member name="use_default_margin" type="bool" setter="set_use_default_margin" getter="get_use_default_margin" default="true">
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In most cases you will want to use the default [Portal] margin in your portals (this is set in the [RoomManager]).
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If you want to override this default, set this value to [code]false[/code], and the local [code]portal_margin[/code] will take effect.
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</member>
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</members>
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<constants>
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</constants>
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</class>
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