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75 lines
3.6 KiB
ReStructuredText
75 lines
3.6 KiB
ReStructuredText
:github_url: hide
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.. _class_PolygonOccluder3D:
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PolygonOccluder3D
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=================
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**繼承：** :ref:`Occluder3D<class_Occluder3D>` **<** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`
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平面 2D 多邊形形狀，用於 :ref:`OccluderInstance3D<class_OccluderInstance3D>` 的遮擋剔除。
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.. rst-class:: classref-introduction-group
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說明
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----
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**PolygonOccluder3D** 儲存的是多邊形形狀，可用於引擎的遮擋剔除系統。在編輯器中選中具有 **PolygonOccluder3D** 的 :ref:`OccluderInstance3D<class_OccluderInstance3D>` 時，3D 視口的頂部會出現用於新增/移除頂點的編輯器。所有的頂點都必須在相同的 2D 平面中放置，也就是說，使用單個 **PolygonOccluder3D** 是無法任意建立 3D 形狀的。要將任意 3D 形狀作為遮擋器，請改用 :ref:`ArrayOccluder3D<class_ArrayOccluder3D>` 或 :ref:`OccluderInstance3D<class_OccluderInstance3D>` 的烘焙功能。
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設定遮擋剔除的步驟見 :ref:`OccluderInstance3D<class_OccluderInstance3D>` 的文件。
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.. rst-class:: classref-introduction-group
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教學
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----
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- :doc:`遮擋剔除 <../tutorials/3d/occlusion_culling>`
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.. rst-class:: classref-reftable-group
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屬性
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----
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.. table::
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:widths: auto
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+-----------------------------------------------------+----------------------------------------------------------+--------------------------+
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| :ref:`PackedVector2Array<class_PackedVector2Array>` | :ref:`polygon<class_PolygonOccluder3D_property_polygon>` | ``PackedVector2Array()`` |
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+-----------------------------------------------------+----------------------------------------------------------+--------------------------+
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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屬性說明
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--------
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.. _class_PolygonOccluder3D_property_polygon:
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.. rst-class:: classref-property
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:ref:`PackedVector2Array<class_PackedVector2Array>` **polygon** = ``PackedVector2Array()`` :ref:`🔗<class_PolygonOccluder3D_property_polygon>`
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.. rst-class:: classref-property-setget
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- |void| **set_polygon**\ (\ value\: :ref:`PackedVector2Array<class_PackedVector2Array>`\ )
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- :ref:`PackedVector2Array<class_PackedVector2Array>` **get_polygon**\ (\ )
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用於遮擋剔除的多邊形。既可以是凸多邊形，也可以是凹多邊形，但只有讓頂點的數量盡可能地少，才能夠讓性能最大化。
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多邊形必須\ *不存在*\ 相交的線。否則三角形化會失敗（同時會輸出錯誤資訊）。
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**Note:** The returned array is *copied* and any changes to it will not update the original property value. See :ref:`PackedVector2Array<class_PackedVector2Array>` for more details.
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.. |virtual| replace:: :abbr:`virtual (本方法通常需要使用者覆寫才能生效。)`
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.. |required| replace:: :abbr:`required (This method is required to be overridden when extending its base class.)`
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.. |const| replace:: :abbr:`const (本方法沒有副作用。不會修改該實例的任何成員變數。)`
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.. |vararg| replace:: :abbr:`vararg (本方法除了這裡描述的參數外，還可以接受任意數量的參數。)`
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.. |constructor| replace:: :abbr:`constructor (本方法用於建構一個型別。)`
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.. |static| replace:: :abbr:`static (本方法無需實例即可呼叫，因此可以直接使用類別名稱呼叫。)`
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.. |operator| replace:: :abbr:`operator (本方法描述將本型別作為左運算元時可用的有效運算子。)`
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.. |bitfield| replace:: :abbr:`BitField (此值是由下列旗標組成的位元遮罩整數。)`
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.. |void| replace:: :abbr:`void (無回傳值。)`
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