godot-docs/classes/class_convexpolygonshape2d.rst

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.. _class_ConvexPolygonShape2D:

ConvexPolygonShape2D
====================

**Inherits:** :ref:`Shape2D<class_Shape2D>` **<** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`

Convex polygon shape resource for 2D physics.

.. rst-class:: classref-introduction-group

Description
-----------

2D convex polygon shape to be added as a *direct* child of a :ref:`PhysicsBody2D<class_PhysicsBody2D>` or :ref:`Area2D<class_Area2D>` using a :ref:`CollisionShape2D<class_CollisionShape2D>` node.

The shape is a *solid* that includes all the points that it encloses, as opposed to :ref:`ConcavePolygonShape2D<class_ConcavePolygonShape2D>` which is hollow if it encloses anything. See also :ref:`CollisionPolygon2D<class_CollisionPolygon2D>`.

The solid nature of the shape makes it well-suited for both detection and physics; in physics body interactions this allows depenetrating even those shapes which end up (e.g. due to high speed) fully inside the convex shape (similarly to primitive shapes, but unlike :ref:`ConcavePolygonShape2D<class_ConcavePolygonShape2D>`). The convexity limits the possible geometric shape of a single **ConvexPolygonShape2D**: it cannot be concave.

\ **Convex decomposition:** Concave objects' collisions can be represented accurately using *several* convex shapes. This allows dynamic physics bodies to have complex concave collisions (at a performance cost). It can be achieved using several **ConvexPolygonShape2D** nodes or by using the :ref:`CollisionPolygon2D<class_CollisionPolygon2D>` node in Solids build mode. To generate a collision polygon from a sprite, select the :ref:`Sprite2D<class_Sprite2D>` node, go to the **Sprite2D** menu that appears above the viewport, and choose **Create Polygon2D Sibling**.

\ **Performance:** **ConvexPolygonShape2D** is faster to check collisions against compared to :ref:`ConcavePolygonShape2D<class_ConcavePolygonShape2D>`, but it is slower than primitive collision shapes such as :ref:`CircleShape2D<class_CircleShape2D>` or :ref:`RectangleShape2D<class_RectangleShape2D>`. Its use should generally be limited to medium-sized objects that cannot have their collision accurately represented by primitive shapes.

.. rst-class:: classref-reftable-group

Properties
----------

.. table::
   :widths: auto

   +-----------------------------------------------------+-----------------------------------------------------------+--------------------------+
   | :ref:`PackedVector2Array<class_PackedVector2Array>` | :ref:`points<class_ConvexPolygonShape2D_property_points>` | ``PackedVector2Array()`` |
   +-----------------------------------------------------+-----------------------------------------------------------+--------------------------+

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Methods
-------

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   :widths: auto

   +------+-------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void | :ref:`set_point_cloud<class_ConvexPolygonShape2D_method_set_point_cloud>` **(** :ref:`PackedVector2Array<class_PackedVector2Array>` point_cloud **)** |
   +------+-------------------------------------------------------------------------------------------------------------------------------------------------------+

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----

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Property Descriptions
---------------------

.. _class_ConvexPolygonShape2D_property_points:

.. rst-class:: classref-property

:ref:`PackedVector2Array<class_PackedVector2Array>` **points** = ``PackedVector2Array()``

.. rst-class:: classref-property-setget

- void **set_points** **(** :ref:`PackedVector2Array<class_PackedVector2Array>` value **)**
- :ref:`PackedVector2Array<class_PackedVector2Array>` **get_points** **(** **)**

The polygon's list of vertices that form a convex hull. Can be in either clockwise or counterclockwise order.

\ **Warning:** Only set this property to a list of points that actually form a convex hull. Use :ref:`set_point_cloud<class_ConvexPolygonShape2D_method_set_point_cloud>` to generate the convex hull of an arbitrary set of points.

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----

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Method Descriptions
-------------------

.. _class_ConvexPolygonShape2D_method_set_point_cloud:

.. rst-class:: classref-method

void **set_point_cloud** **(** :ref:`PackedVector2Array<class_PackedVector2Array>` point_cloud **)**

Based on the set of points provided, this assigns the :ref:`points<class_ConvexPolygonShape2D_property_points>` property using the convex hull algorithm, removing all unneeded points. See :ref:`Geometry2D.convex_hull<class_Geometry2D_method_convex_hull>` for details.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`