godot-docs/classes/class_arraymesh.rst

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.. _class_ArrayMesh:

ArrayMesh
=========

**Inherits:** :ref:`Mesh<class_Mesh>` **<** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`

:ref:`Mesh<class_Mesh>` type that provides utility for constructing a surface from arrays.

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

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

The **ArrayMesh** is used to construct a :ref:`Mesh<class_Mesh>` by specifying the attributes as arrays.

The most basic example is the creation of a single triangle:


.. tabs::

 .. code-tab:: gdscript

    var vertices = PackedVector3Array()
    vertices.push_back(Vector3(0, 1, 0))
    vertices.push_back(Vector3(1, 0, 0))
    vertices.push_back(Vector3(0, 0, 1))
    
    # Initialize the ArrayMesh.
    var arr_mesh = ArrayMesh.new()
    var arrays = []
    arrays.resize(Mesh.ARRAY_MAX)
    arrays[Mesh.ARRAY_VERTEX] = vertices
    
    # Create the Mesh.
    arr_mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
    var m = MeshInstance3D.new()
    m.mesh = arr_mesh

 .. code-tab:: csharp

    var vertices = new Vector3[]
    {
        new Vector3(0, 1, 0),
        new Vector3(1, 0, 0),
        new Vector3(0, 0, 1),
    };
    
    // Initialize the ArrayMesh.
    var arrMesh = new ArrayMesh();
    var arrays = new Godot.Collections.Array();
    arrays.Resize((int)Mesh.ArrayType.Max);
    arrays[(int)Mesh.ArrayType.Vertex] = vertices;
    
    // Create the Mesh.
    arrMesh.AddSurfaceFromArrays(Mesh.PrimitiveType.Triangles, arrays);
    var m = new MeshInstance3D();
    m.Mesh = arrMesh;



The :ref:`MeshInstance3D<class_MeshInstance3D>` is ready to be added to the :ref:`SceneTree<class_SceneTree>` to be shown.

See also :ref:`ImmediateMesh<class_ImmediateMesh>`, :ref:`MeshDataTool<class_MeshDataTool>` and :ref:`SurfaceTool<class_SurfaceTool>` for procedural geometry generation.

\ **Note:** Godot uses clockwise `winding order <https://learnopengl.com/Advanced-OpenGL/Face-culling>`__ for front faces of triangle primitive modes.

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

Tutorials
---------

- :doc:`Procedural geometry using the ArrayMesh <../tutorials/3d/procedural_geometry/arraymesh>`

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

Properties
----------

.. table::
   :widths: auto

   +-------------------------------------------------+--------------------------------------------------------------------+----------------------------+
   | :ref:`BlendShapeMode<enum_Mesh_BlendShapeMode>` | :ref:`blend_shape_mode<class_ArrayMesh_property_blend_shape_mode>` | ``1``                      |
   +-------------------------------------------------+--------------------------------------------------------------------+----------------------------+
   | :ref:`AABB<class_AABB>`                         | :ref:`custom_aabb<class_ArrayMesh_property_custom_aabb>`           | ``AABB(0, 0, 0, 0, 0, 0)`` |
   +-------------------------------------------------+--------------------------------------------------------------------+----------------------------+
   | :ref:`ArrayMesh<class_ArrayMesh>`               | :ref:`shadow_mesh<class_ArrayMesh_property_shadow_mesh>`           |                            |
   +-------------------------------------------------+--------------------------------------------------------------------+----------------------------+

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

Methods
-------

.. table::
   :widths: auto

   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`add_blend_shape<class_ArrayMesh_method_add_blend_shape>` **(** :ref:`StringName<class_StringName>` name **)**                                                                                                                                                                                                    |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`add_surface_from_arrays<class_ArrayMesh_method_add_surface_from_arrays>` **(** :ref:`PrimitiveType<enum_Mesh_PrimitiveType>` primitive, :ref:`Array<class_Array>` arrays, :ref:`Array[]<class_Array>` blend_shapes=[], :ref:`Dictionary<class_Dictionary>` lods={}, :ref:`int<class_int>` compress_flags=0 **)** |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`clear_blend_shapes<class_ArrayMesh_method_clear_blend_shapes>` **(** **)**                                                                                                                                                                                                                                       |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`clear_surfaces<class_ArrayMesh_method_clear_surfaces>` **(** **)**                                                                                                                                                                                                                                               |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                         | :ref:`get_blend_shape_count<class_ArrayMesh_method_get_blend_shape_count>` **(** **)** |const|                                                                                                                                                                                                                         |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`StringName<class_StringName>`           | :ref:`get_blend_shape_name<class_ArrayMesh_method_get_blend_shape_name>` **(** :ref:`int<class_int>` index **)** |const|                                                                                                                                                                                               |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Error<enum_@GlobalScope_Error>`         | :ref:`lightmap_unwrap<class_ArrayMesh_method_lightmap_unwrap>` **(** :ref:`Transform3D<class_Transform3D>` transform, :ref:`float<class_float>` texel_size **)**                                                                                                                                                       |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`regen_normal_maps<class_ArrayMesh_method_regen_normal_maps>` **(** **)**                                                                                                                                                                                                                                         |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`set_blend_shape_name<class_ArrayMesh_method_set_blend_shape_name>` **(** :ref:`int<class_int>` index, :ref:`StringName<class_StringName>` name **)**                                                                                                                                                             |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                         | :ref:`surface_find_by_name<class_ArrayMesh_method_surface_find_by_name>` **(** :ref:`String<class_String>` name **)** |const|                                                                                                                                                                                          |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                         | :ref:`surface_get_array_index_len<class_ArrayMesh_method_surface_get_array_index_len>` **(** :ref:`int<class_int>` surf_idx **)** |const|                                                                                                                                                                              |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                         | :ref:`surface_get_array_len<class_ArrayMesh_method_surface_get_array_len>` **(** :ref:`int<class_int>` surf_idx **)** |const|                                                                                                                                                                                          |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`int<class_int>`                         | :ref:`surface_get_format<class_ArrayMesh_method_surface_get_format>` **(** :ref:`int<class_int>` surf_idx **)** |const|                                                                                                                                                                                                |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`String<class_String>`                   | :ref:`surface_get_name<class_ArrayMesh_method_surface_get_name>` **(** :ref:`int<class_int>` surf_idx **)** |const|                                                                                                                                                                                                    |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`PrimitiveType<enum_Mesh_PrimitiveType>` | :ref:`surface_get_primitive_type<class_ArrayMesh_method_surface_get_primitive_type>` **(** :ref:`int<class_int>` surf_idx **)** |const|                                                                                                                                                                                |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`surface_set_name<class_ArrayMesh_method_surface_set_name>` **(** :ref:`int<class_int>` surf_idx, :ref:`String<class_String>` name **)**                                                                                                                                                                          |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`surface_update_attribute_region<class_ArrayMesh_method_surface_update_attribute_region>` **(** :ref:`int<class_int>` surf_idx, :ref:`int<class_int>` offset, :ref:`PackedByteArray<class_PackedByteArray>` data **)**                                                                                            |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`surface_update_skin_region<class_ArrayMesh_method_surface_update_skin_region>` **(** :ref:`int<class_int>` surf_idx, :ref:`int<class_int>` offset, :ref:`PackedByteArray<class_PackedByteArray>` data **)**                                                                                                      |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`surface_update_vertex_region<class_ArrayMesh_method_surface_update_vertex_region>` **(** :ref:`int<class_int>` surf_idx, :ref:`int<class_int>` offset, :ref:`PackedByteArray<class_PackedByteArray>` data **)**                                                                                                  |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

.. rst-class:: classref-section-separator

----

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

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

.. _class_ArrayMesh_property_blend_shape_mode:

.. rst-class:: classref-property

:ref:`BlendShapeMode<enum_Mesh_BlendShapeMode>` **blend_shape_mode** = ``1``

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

- void **set_blend_shape_mode** **(** :ref:`BlendShapeMode<enum_Mesh_BlendShapeMode>` value **)**
- :ref:`BlendShapeMode<enum_Mesh_BlendShapeMode>` **get_blend_shape_mode** **(** **)**

Sets the blend shape mode to one of :ref:`BlendShapeMode<enum_Mesh_BlendShapeMode>`.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_property_custom_aabb:

.. rst-class:: classref-property

:ref:`AABB<class_AABB>` **custom_aabb** = ``AABB(0, 0, 0, 0, 0, 0)``

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

- void **set_custom_aabb** **(** :ref:`AABB<class_AABB>` value **)**
- :ref:`AABB<class_AABB>` **get_custom_aabb** **(** **)**

Overrides the :ref:`AABB<class_AABB>` with one defined by user for use with frustum culling. Especially useful to avoid unexpected culling when using a shader to offset vertices.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_property_shadow_mesh:

.. rst-class:: classref-property

:ref:`ArrayMesh<class_ArrayMesh>` **shadow_mesh**

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

- void **set_shadow_mesh** **(** :ref:`ArrayMesh<class_ArrayMesh>` value **)**
- :ref:`ArrayMesh<class_ArrayMesh>` **get_shadow_mesh** **(** **)**

.. container:: contribute

	There is currently no description for this property. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

.. rst-class:: classref-section-separator

----

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

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

.. _class_ArrayMesh_method_add_blend_shape:

.. rst-class:: classref-method

void **add_blend_shape** **(** :ref:`StringName<class_StringName>` name **)**

Adds name for a blend shape that will be added with :ref:`add_surface_from_arrays<class_ArrayMesh_method_add_surface_from_arrays>`. Must be called before surface is added.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_add_surface_from_arrays:

.. rst-class:: classref-method

void **add_surface_from_arrays** **(** :ref:`PrimitiveType<enum_Mesh_PrimitiveType>` primitive, :ref:`Array<class_Array>` arrays, :ref:`Array[]<class_Array>` blend_shapes=[], :ref:`Dictionary<class_Dictionary>` lods={}, :ref:`int<class_int>` compress_flags=0 **)**

Creates a new surface.

Surfaces are created to be rendered using a ``primitive``, which may be any of the types defined in :ref:`PrimitiveType<enum_Mesh_PrimitiveType>`. (As a note, when using indices, it is recommended to only use points, lines, or triangles.) :ref:`Mesh.get_surface_count<class_Mesh_method_get_surface_count>` will become the ``surf_idx`` for this new surface.

The ``arrays`` argument is an array of arrays. See :ref:`ArrayType<enum_Mesh_ArrayType>` for the values used in this array. For example, ``arrays[0]`` is the array of vertices. That first vertex sub-array is always required; the others are optional. Adding an index array puts this function into "index mode" where the vertex and other arrays become the sources of data and the index array defines the vertex order. All sub-arrays must have the same length as the vertex array (or be an exact multiple of the vertex array's length, when multiple elements of a sub-array correspond to a single vertex) or be empty, except for :ref:`Mesh.ARRAY_INDEX<class_Mesh_constant_ARRAY_INDEX>` if it is used.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_clear_blend_shapes:

.. rst-class:: classref-method

void **clear_blend_shapes** **(** **)**

Removes all blend shapes from this **ArrayMesh**.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_clear_surfaces:

.. rst-class:: classref-method

void **clear_surfaces** **(** **)**

Removes all surfaces from this **ArrayMesh**.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_get_blend_shape_count:

.. rst-class:: classref-method

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

Returns the number of blend shapes that the **ArrayMesh** holds.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_get_blend_shape_name:

.. rst-class:: classref-method

:ref:`StringName<class_StringName>` **get_blend_shape_name** **(** :ref:`int<class_int>` index **)** |const|

Returns the name of the blend shape at this index.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_lightmap_unwrap:

.. rst-class:: classref-method

:ref:`Error<enum_@GlobalScope_Error>` **lightmap_unwrap** **(** :ref:`Transform3D<class_Transform3D>` transform, :ref:`float<class_float>` texel_size **)**

Performs a UV unwrap on the **ArrayMesh** to prepare the mesh for lightmapping.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_regen_normal_maps:

.. rst-class:: classref-method

void **regen_normal_maps** **(** **)**

Regenerates tangents for each of the **ArrayMesh**'s surfaces.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_set_blend_shape_name:

.. rst-class:: classref-method

void **set_blend_shape_name** **(** :ref:`int<class_int>` index, :ref:`StringName<class_StringName>` name **)**

Sets the name of the blend shape at this index.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_surface_find_by_name:

.. rst-class:: classref-method

:ref:`int<class_int>` **surface_find_by_name** **(** :ref:`String<class_String>` name **)** |const|

Returns the index of the first surface with this name held within this **ArrayMesh**. If none are found, -1 is returned.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_surface_get_array_index_len:

.. rst-class:: classref-method

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

Returns the length in indices of the index array in the requested surface (see :ref:`add_surface_from_arrays<class_ArrayMesh_method_add_surface_from_arrays>`).

.. rst-class:: classref-item-separator

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.. _class_ArrayMesh_method_surface_get_array_len:

.. rst-class:: classref-method

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

Returns the length in vertices of the vertex array in the requested surface (see :ref:`add_surface_from_arrays<class_ArrayMesh_method_add_surface_from_arrays>`).

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_surface_get_format:

.. rst-class:: classref-method

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

Returns the format mask of the requested surface (see :ref:`add_surface_from_arrays<class_ArrayMesh_method_add_surface_from_arrays>`).

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_surface_get_name:

.. rst-class:: classref-method

:ref:`String<class_String>` **surface_get_name** **(** :ref:`int<class_int>` surf_idx **)** |const|

Gets the name assigned to this surface.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_surface_get_primitive_type:

.. rst-class:: classref-method

:ref:`PrimitiveType<enum_Mesh_PrimitiveType>` **surface_get_primitive_type** **(** :ref:`int<class_int>` surf_idx **)** |const|

Returns the primitive type of the requested surface (see :ref:`add_surface_from_arrays<class_ArrayMesh_method_add_surface_from_arrays>`).

.. rst-class:: classref-item-separator

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.. _class_ArrayMesh_method_surface_set_name:

.. rst-class:: classref-method

void **surface_set_name** **(** :ref:`int<class_int>` surf_idx, :ref:`String<class_String>` name **)**

Sets a name for a given surface.

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_surface_update_attribute_region:

.. rst-class:: classref-method

void **surface_update_attribute_region** **(** :ref:`int<class_int>` surf_idx, :ref:`int<class_int>` offset, :ref:`PackedByteArray<class_PackedByteArray>` data **)**

.. container:: contribute

	There is currently no description for this method. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_surface_update_skin_region:

.. rst-class:: classref-method

void **surface_update_skin_region** **(** :ref:`int<class_int>` surf_idx, :ref:`int<class_int>` offset, :ref:`PackedByteArray<class_PackedByteArray>` data **)**

.. container:: contribute

	There is currently no description for this method. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

.. rst-class:: classref-item-separator

----

.. _class_ArrayMesh_method_surface_update_vertex_region:

.. rst-class:: classref-method

void **surface_update_vertex_region** **(** :ref:`int<class_int>` surf_idx, :ref:`int<class_int>` offset, :ref:`PackedByteArray<class_PackedByteArray>` data **)**

.. container:: contribute

	There is currently no description for this method. Please help us by :ref:`contributing one <doc_updating_the_class_reference>`!

.. |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.)`