godot-docs/classes/class_meshinstance3d.rst

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.. _class_MeshInstance3D:

MeshInstance3D
==============

**Inherits:** :ref:`GeometryInstance3D<class_GeometryInstance3D>` **<** :ref:`VisualInstance3D<class_VisualInstance3D>` **<** :ref:`Node3D<class_Node3D>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

**Inherited By:** :ref:`SoftBody3D<class_SoftBody3D>`

Node that instances meshes into a scenario.

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

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

MeshInstance3D is a node that takes a :ref:`Mesh<class_Mesh>` resource and adds it to the current scenario by creating an instance of it. This is the class most often used render 3D geometry and can be used to instance a single :ref:`Mesh<class_Mesh>` in many places. This allows reusing geometry, which can save on resources. When a :ref:`Mesh<class_Mesh>` has to be instantiated more than thousands of times at close proximity, consider using a :ref:`MultiMesh<class_MultiMesh>` in a :ref:`MultiMeshInstance3D<class_MultiMeshInstance3D>` instead.

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Tutorials
---------

- `3D Material Testers Demo <https://godotengine.org/asset-library/asset/123>`__

- `3D Kinematic Character Demo <https://godotengine.org/asset-library/asset/126>`__

- `3D Platformer Demo <https://godotengine.org/asset-library/asset/125>`__

- `Third Person Shooter Demo <https://godotengine.org/asset-library/asset/678>`__

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Properties
----------

.. table::
   :widths: auto

   +---------------------------------+---------------------------------------------------------+--------------------+
   | :ref:`Mesh<class_Mesh>`         | :ref:`mesh<class_MeshInstance3D_property_mesh>`         |                    |
   +---------------------------------+---------------------------------------------------------+--------------------+
   | :ref:`NodePath<class_NodePath>` | :ref:`skeleton<class_MeshInstance3D_property_skeleton>` | ``NodePath("..")`` |
   +---------------------------------+---------------------------------------------------------+--------------------+
   | :ref:`Skin<class_Skin>`         | :ref:`skin<class_MeshInstance3D_property_skin>`         |                    |
   +---------------------------------+---------------------------------------------------------+--------------------+

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Methods
-------

.. table::
   :widths: auto

   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                            | :ref:`create_convex_collision<class_MeshInstance3D_method_create_convex_collision>` **(** :ref:`bool<class_bool>` clean=true, :ref:`bool<class_bool>` simplify=false **)**          |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                            | :ref:`create_debug_tangents<class_MeshInstance3D_method_create_debug_tangents>` **(** **)**                                                                                         |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                            | :ref:`create_multiple_convex_collisions<class_MeshInstance3D_method_create_multiple_convex_collisions>` **(** **)**                                                                 |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                            | :ref:`create_trimesh_collision<class_MeshInstance3D_method_create_trimesh_collision>` **(** **)**                                                                                   |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`           | :ref:`find_blend_shape_by_name<class_MeshInstance3D_method_find_blend_shape_by_name>` **(** :ref:`StringName<class_StringName>` name **)**                                          |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Material<class_Material>` | :ref:`get_active_material<class_MeshInstance3D_method_get_active_material>` **(** :ref:`int<class_int>` surface **)** |const|                                                       |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`           | :ref:`get_blend_shape_count<class_MeshInstance3D_method_get_blend_shape_count>` **(** **)** |const|                                                                                 |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`float<class_float>`       | :ref:`get_blend_shape_value<class_MeshInstance3D_method_get_blend_shape_value>` **(** :ref:`int<class_int>` blend_shape_idx **)** |const|                                           |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Material<class_Material>` | :ref:`get_surface_override_material<class_MeshInstance3D_method_get_surface_override_material>` **(** :ref:`int<class_int>` surface **)** |const|                                   |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`           | :ref:`get_surface_override_material_count<class_MeshInstance3D_method_get_surface_override_material_count>` **(** **)** |const|                                                     |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                            | :ref:`set_blend_shape_value<class_MeshInstance3D_method_set_blend_shape_value>` **(** :ref:`int<class_int>` blend_shape_idx, :ref:`float<class_float>` value **)**                  |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                            | :ref:`set_surface_override_material<class_MeshInstance3D_method_set_surface_override_material>` **(** :ref:`int<class_int>` surface, :ref:`Material<class_Material>` material **)** |
   +---------------------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

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

.. _class_MeshInstance3D_property_mesh:

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:ref:`Mesh<class_Mesh>` **mesh**

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

- void **set_mesh** **(** :ref:`Mesh<class_Mesh>` value **)**
- :ref:`Mesh<class_Mesh>` **get_mesh** **(** **)**

The :ref:`Mesh<class_Mesh>` resource for the instance.

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----

.. _class_MeshInstance3D_property_skeleton:

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:ref:`NodePath<class_NodePath>` **skeleton** = ``NodePath("..")``

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- void **set_skeleton_path** **(** :ref:`NodePath<class_NodePath>` value **)**
- :ref:`NodePath<class_NodePath>` **get_skeleton_path** **(** **)**

:ref:`NodePath<class_NodePath>` to the :ref:`Skeleton3D<class_Skeleton3D>` associated with the instance.

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----

.. _class_MeshInstance3D_property_skin:

.. rst-class:: classref-property

:ref:`Skin<class_Skin>` **skin**

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

- void **set_skin** **(** :ref:`Skin<class_Skin>` value **)**
- :ref:`Skin<class_Skin>` **get_skin** **(** **)**

The :ref:`Skin<class_Skin>` to be used by this instance.

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.. rst-class:: classref-descriptions-group

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

.. _class_MeshInstance3D_method_create_convex_collision:

.. rst-class:: classref-method

void **create_convex_collision** **(** :ref:`bool<class_bool>` clean=true, :ref:`bool<class_bool>` simplify=false **)**

This helper creates a :ref:`StaticBody3D<class_StaticBody3D>` child node with a :ref:`ConvexPolygonShape3D<class_ConvexPolygonShape3D>` collision shape calculated from the mesh geometry. It's mainly used for testing.

If ``clean`` is ``true`` (default), duplicate and interior vertices are removed automatically. You can set it to ``false`` to make the process faster if not needed.

If ``simplify`` is ``true``, the geometry can be further simplified to reduce the number of vertices. Disabled by default.

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.. _class_MeshInstance3D_method_create_debug_tangents:

.. rst-class:: classref-method

void **create_debug_tangents** **(** **)**

This helper creates a **MeshInstance3D** child node with gizmos at every vertex calculated from the mesh geometry. It's mainly used for testing.

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.. _class_MeshInstance3D_method_create_multiple_convex_collisions:

.. rst-class:: classref-method

void **create_multiple_convex_collisions** **(** **)**

This helper creates a :ref:`StaticBody3D<class_StaticBody3D>` child node with multiple :ref:`ConvexPolygonShape3D<class_ConvexPolygonShape3D>` collision shapes calculated from the mesh geometry via convex decomposition. It's mainly used for testing.

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.. _class_MeshInstance3D_method_create_trimesh_collision:

.. rst-class:: classref-method

void **create_trimesh_collision** **(** **)**

This helper creates a :ref:`StaticBody3D<class_StaticBody3D>` child node with a :ref:`ConcavePolygonShape3D<class_ConcavePolygonShape3D>` collision shape calculated from the mesh geometry. It's mainly used for testing.

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.. _class_MeshInstance3D_method_find_blend_shape_by_name:

.. rst-class:: classref-method

:ref:`int<class_int>` **find_blend_shape_by_name** **(** :ref:`StringName<class_StringName>` name **)**

Returns the index of the blend shape with the given ``name``. Returns ``-1`` if no blend shape with this name exists, including when :ref:`mesh<class_MeshInstance3D_property_mesh>` is ``null``.

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.. _class_MeshInstance3D_method_get_active_material:

.. rst-class:: classref-method

:ref:`Material<class_Material>` **get_active_material** **(** :ref:`int<class_int>` surface **)** |const|

Returns the :ref:`Material<class_Material>` that will be used by the :ref:`Mesh<class_Mesh>` when drawing. This can return the :ref:`GeometryInstance3D.material_override<class_GeometryInstance3D_property_material_override>`, the surface override :ref:`Material<class_Material>` defined in this **MeshInstance3D**, or the surface :ref:`Material<class_Material>` defined in the :ref:`mesh<class_MeshInstance3D_property_mesh>`. For example, if :ref:`GeometryInstance3D.material_override<class_GeometryInstance3D_property_material_override>` is used, all surfaces will return the override material.

Returns ``null`` if no material is active, including when :ref:`mesh<class_MeshInstance3D_property_mesh>` is ``null``.

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.. _class_MeshInstance3D_method_get_blend_shape_count:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_blend_shape_count** **(** **)** |const|

Returns the number of blend shapes available. Produces an error if :ref:`mesh<class_MeshInstance3D_property_mesh>` is ``null``.

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.. _class_MeshInstance3D_method_get_blend_shape_value:

.. rst-class:: classref-method

:ref:`float<class_float>` **get_blend_shape_value** **(** :ref:`int<class_int>` blend_shape_idx **)** |const|

Returns the value of the blend shape at the given ``blend_shape_idx``. Returns ``0.0`` and produces an error if :ref:`mesh<class_MeshInstance3D_property_mesh>` is ``null`` or doesn't have a blend shape at that index.

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.. _class_MeshInstance3D_method_get_surface_override_material:

.. rst-class:: classref-method

:ref:`Material<class_Material>` **get_surface_override_material** **(** :ref:`int<class_int>` surface **)** |const|

Returns the override :ref:`Material<class_Material>` for the specified ``surface`` of the :ref:`Mesh<class_Mesh>` resource.

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.. _class_MeshInstance3D_method_get_surface_override_material_count:

.. rst-class:: classref-method

:ref:`int<class_int>` **get_surface_override_material_count** **(** **)** |const|

Returns the number of surface override materials. This is equivalent to :ref:`Mesh.get_surface_count<class_Mesh_method_get_surface_count>`.

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.. _class_MeshInstance3D_method_set_blend_shape_value:

.. rst-class:: classref-method

void **set_blend_shape_value** **(** :ref:`int<class_int>` blend_shape_idx, :ref:`float<class_float>` value **)**

Sets the value of the blend shape at ``blend_shape_idx`` to ``value``. Produces an error if :ref:`mesh<class_MeshInstance3D_property_mesh>` is ``null`` or doesn't have a blend shape at that index.

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.. _class_MeshInstance3D_method_set_surface_override_material:

.. rst-class:: classref-method

void **set_surface_override_material** **(** :ref:`int<class_int>` surface, :ref:`Material<class_Material>` material **)**

Sets the override ``material`` for the specified ``surface`` of the :ref:`Mesh<class_Mesh>` resource. This material is associated with this **MeshInstance3D** rather than with :ref:`mesh<class_MeshInstance3D_property_mesh>`.

.. |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.)`