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131 lines
6.2 KiB
ReStructuredText
131 lines
6.2 KiB
ReStructuredText
:github_url: hide
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.. _class_TriangleMesh:
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TriangleMesh
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============
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**继承:** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`
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用于高效、无物理交互查询的三角形几何体。
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.. rst-class:: classref-introduction-group
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描述
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----
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在三角形几何体周围创建一个包围体积层次(Bounding Volume Hierarchy,BVH)树结构。
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三角形 BVH 树可以用于高效的交互查询,无需涉及物理引擎。
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例如,在编辑器工具中可以用来根据鼠标光标位置选择具有复杂形状的对象。
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\ **性能:**\ 为复杂几何体创建 BVH 树是一个缓慢的过程,最好在后台线程中进行。
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.. rst-class:: classref-reftable-group
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方法
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----
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.. table::
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:widths: auto
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+-----------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`create_from_faces<class_TriangleMesh_method_create_from_faces>`\ (\ faces\: :ref:`PackedVector3Array<class_PackedVector3Array>`\ ) |
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+-----------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`PackedVector3Array<class_PackedVector3Array>` | :ref:`get_faces<class_TriangleMesh_method_get_faces>`\ (\ ) |const| |
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+-----------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Dictionary<class_Dictionary>` | :ref:`intersect_ray<class_TriangleMesh_method_intersect_ray>`\ (\ begin\: :ref:`Vector3<class_Vector3>`, dir\: :ref:`Vector3<class_Vector3>`\ ) |const| |
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+-----------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Dictionary<class_Dictionary>` | :ref:`intersect_segment<class_TriangleMesh_method_intersect_segment>`\ (\ begin\: :ref:`Vector3<class_Vector3>`, end\: :ref:`Vector3<class_Vector3>`\ ) |const| |
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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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方法说明
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--------
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.. _class_TriangleMesh_method_create_from_faces:
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.. rst-class:: classref-method
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:ref:`bool<class_bool>` **create_from_faces**\ (\ faces\: :ref:`PackedVector3Array<class_PackedVector3Array>`\ ) :ref:`🔗<class_TriangleMesh_method_create_from_faces>`
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根据面数组创建 BVH 树。输入的 ``faces`` 数组中的每三个顶点代表一个三角形(面)。
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如果树成功构建则返回 ``true``\ ,否则返回 ``false``\ 。
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.. rst-class:: classref-item-separator
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----
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.. _class_TriangleMesh_method_get_faces:
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.. rst-class:: classref-method
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:ref:`PackedVector3Array<class_PackedVector3Array>` **get_faces**\ (\ ) |const| :ref:`🔗<class_TriangleMesh_method_get_faces>`
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返回几何体中所有面的副本。数组中每三个顶点代表一个三角形(面)。
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.. rst-class:: classref-item-separator
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----
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.. _class_TriangleMesh_method_intersect_ray:
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.. rst-class:: classref-method
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:ref:`Dictionary<class_Dictionary>` **intersect_ray**\ (\ begin\: :ref:`Vector3<class_Vector3>`, dir\: :ref:`Vector3<class_Vector3>`\ ) |const| :ref:`🔗<class_TriangleMesh_method_intersect_ray>`
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检测与射线的交点,射线从 ``begin`` 开始,朝向 ``dir``\ ,无限延伸。
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如果与某个三角形存在交点,则返回一个 :ref:`Dictionary<class_Dictionary>`\ ,其中包含以下字段:
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\ ``position``\ :相交三角形上的位置。
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\ ``normal``\ :相交三角形的法线。
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\ ``face_index``\ :相交三角形的索引。
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如果不存在交点则返回空 :ref:`Dictionary<class_Dictionary>`\ 。
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另见 :ref:`intersect_segment()<class_TriangleMesh_method_intersect_segment>`\ ,与此方法类似,但使用的是线段,长度有限。
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.. rst-class:: classref-item-separator
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----
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.. _class_TriangleMesh_method_intersect_segment:
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.. rst-class:: classref-method
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:ref:`Dictionary<class_Dictionary>` **intersect_segment**\ (\ begin\: :ref:`Vector3<class_Vector3>`, end\: :ref:`Vector3<class_Vector3>`\ ) |const| :ref:`🔗<class_TriangleMesh_method_intersect_segment>`
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检测与线段的交点,线段从 ``begin`` 开始,到 ``end`` 结束。
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如果与某个三角形存在交点,则返回一个 :ref:`Dictionary<class_Dictionary>`\ ,其中包含以下字段:
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\ ``position``\ :相交三角形上的位置。
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\ ``normal``\ :相交三角形的法线。
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\ ``face_index``\ :相交三角形的索引。
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如果不存在交点则返回空 :ref:`Dictionary<class_Dictionary>`\ 。
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另见 :ref:`intersect_ray()<class_TriangleMesh_method_intersect_ray>`\ ,与此方法类似,但使用的是射线,长度无限。
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.. |virtual| replace:: :abbr:`virtual (本方法通常需要用户覆盖才能生效。)`
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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 (本方法无副作用,不会修改该实例的任何成员变量。)`
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.. |vararg| replace:: :abbr:`vararg (本方法除了能接受在此处描述的参数外,还能够继续接受任意数量的参数。)`
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.. |constructor| replace:: :abbr:`constructor (本方法用于构造某个类型。)`
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.. |static| replace:: :abbr:`static (调用本方法无需实例,可直接使用类名进行调用。)`
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.. |operator| replace:: :abbr:`operator (本方法描述的是使用本类型作为左操作数的有效运算符。)`
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.. |bitfield| replace:: :abbr:`BitField (这个值是由下列位标志构成位掩码的整数。)`
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.. |void| replace:: :abbr:`void (无返回值。)`
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