godot-docs/classes/class_surfacetool.rst

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.. DO NOT EDIT THIS FILE!!!
.. Generated automatically from Godot engine sources.
.. Generator: https://github.com/godotengine/godot/tree/4.2/doc/tools/make_rst.py.
.. XML source: https://github.com/godotengine/godot/tree/4.2/doc/classes/SurfaceTool.xml.

.. _class_SurfaceTool:

SurfaceTool
===========

**Inherits:** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`

Helper tool to create geometry.

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

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

The **SurfaceTool** is used to construct a :ref:`Mesh<class_Mesh>` by specifying vertex attributes individually. It can be used to construct a :ref:`Mesh<class_Mesh>` from a script. All properties except indices need to be added before calling :ref:`add_vertex<class_SurfaceTool_method_add_vertex>`. For example, to add vertex colors and UVs:


.. tabs::

 .. code-tab:: gdscript

    var st = SurfaceTool.new()
    st.begin(Mesh.PRIMITIVE_TRIANGLES)
    st.set_color(Color(1, 0, 0))
    st.set_uv(Vector2(0, 0))
    st.add_vertex(Vector3(0, 0, 0))

 .. code-tab:: csharp

    var st = new SurfaceTool();
    st.Begin(Mesh.PrimitiveType.Triangles);
    st.SetColor(new Color(1, 0, 0));
    st.SetUV(new Vector2(0, 0));
    st.AddVertex(new Vector3(0, 0, 0));



The above **SurfaceTool** now contains one vertex of a triangle which has a UV coordinate and a specified :ref:`Color<class_Color>`. If another vertex were added without calling :ref:`set_uv<class_SurfaceTool_method_set_uv>` or :ref:`set_color<class_SurfaceTool_method_set_color>`, then the last values would be used.

Vertex attributes must be passed **before** calling :ref:`add_vertex<class_SurfaceTool_method_add_vertex>`. Failure to do so will result in an error when committing the vertex information to a mesh.

Additionally, the attributes used before the first vertex is added determine the format of the mesh. For example, if you only add UVs to the first vertex, you cannot add color to any of the subsequent vertices.

See also :ref:`ArrayMesh<class_ArrayMesh>`, :ref:`ImmediateMesh<class_ImmediateMesh>` and :ref:`MeshDataTool<class_MeshDataTool>` 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:`Using the SurfaceTool <../tutorials/3d/procedural_geometry/surfacetool>`

- `3D Voxel Demo <https://godotengine.org/asset-library/asset/676>`__

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

Methods
-------

.. table::
   :widths: auto

   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`add_index<class_SurfaceTool_method_add_index>` **(** :ref:`int<class_int>` index **)**                                                                                                                                                                                                                                                                                                                                                                                                                   |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`add_triangle_fan<class_SurfaceTool_method_add_triangle_fan>` **(** :ref:`PackedVector3Array<class_PackedVector3Array>` vertices, :ref:`PackedVector2Array<class_PackedVector2Array>` uvs=PackedVector2Array(), :ref:`PackedColorArray<class_PackedColorArray>` colors=PackedColorArray(), :ref:`PackedVector2Array<class_PackedVector2Array>` uv2s=PackedVector2Array(), :ref:`PackedVector3Array<class_PackedVector3Array>` normals=PackedVector3Array(), :ref:`Plane[]<class_Plane>` tangents=[] **)** |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`add_vertex<class_SurfaceTool_method_add_vertex>` **(** :ref:`Vector3<class_Vector3>` vertex **)**                                                                                                                                                                                                                                                                                                                                                                                                        |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`append_from<class_SurfaceTool_method_append_from>` **(** :ref:`Mesh<class_Mesh>` existing, :ref:`int<class_int>` surface, :ref:`Transform3D<class_Transform3D>` transform **)**                                                                                                                                                                                                                                                                                                                          |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`begin<class_SurfaceTool_method_begin>` **(** :ref:`PrimitiveType<enum_Mesh_PrimitiveType>` primitive **)**                                                                                                                                                                                                                                                                                                                                                                                               |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`clear<class_SurfaceTool_method_clear>` **(** **)**                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`ArrayMesh<class_ArrayMesh>`                        | :ref:`commit<class_SurfaceTool_method_commit>` **(** :ref:`ArrayMesh<class_ArrayMesh>` existing=null, :ref:`int<class_int>` flags=0 **)**                                                                                                                                                                                                                                                                                                                                                                      |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Array<class_Array>`                                | :ref:`commit_to_arrays<class_SurfaceTool_method_commit_to_arrays>` **(** **)**                                                                                                                                                                                                                                                                                                                                                                                                                                 |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`create_from<class_SurfaceTool_method_create_from>` **(** :ref:`Mesh<class_Mesh>` existing, :ref:`int<class_int>` surface **)**                                                                                                                                                                                                                                                                                                                                                                           |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`create_from_blend_shape<class_SurfaceTool_method_create_from_blend_shape>` **(** :ref:`Mesh<class_Mesh>` existing, :ref:`int<class_int>` surface, :ref:`String<class_String>` blend_shape **)**                                                                                                                                                                                                                                                                                                          |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`deindex<class_SurfaceTool_method_deindex>` **(** **)**                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`PackedInt32Array<class_PackedInt32Array>`          | :ref:`generate_lod<class_SurfaceTool_method_generate_lod>` **(** :ref:`float<class_float>` nd_threshold, :ref:`int<class_int>` target_index_count=3 **)**                                                                                                                                                                                                                                                                                                                                                      |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`generate_normals<class_SurfaceTool_method_generate_normals>` **(** :ref:`bool<class_bool>` flip=false **)**                                                                                                                                                                                                                                                                                                                                                                                              |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`generate_tangents<class_SurfaceTool_method_generate_tangents>` **(** **)**                                                                                                                                                                                                                                                                                                                                                                                                                               |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`AABB<class_AABB>`                                  | :ref:`get_aabb<class_SurfaceTool_method_get_aabb>` **(** **)** |const|                                                                                                                                                                                                                                                                                                                                                                                                                                         |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`CustomFormat<enum_SurfaceTool_CustomFormat>`       | :ref:`get_custom_format<class_SurfaceTool_method_get_custom_format>` **(** :ref:`int<class_int>` channel_index **)** |const|                                                                                                                                                                                                                                                                                                                                                                                   |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`PrimitiveType<enum_Mesh_PrimitiveType>`            | :ref:`get_primitive_type<class_SurfaceTool_method_get_primitive_type>` **(** **)** |const|                                                                                                                                                                                                                                                                                                                                                                                                                     |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`SkinWeightCount<enum_SurfaceTool_SkinWeightCount>` | :ref:`get_skin_weight_count<class_SurfaceTool_method_get_skin_weight_count>` **(** **)** |const|                                                                                                                                                                                                                                                                                                                                                                                                               |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`index<class_SurfaceTool_method_index>` **(** **)**                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`optimize_indices_for_cache<class_SurfaceTool_method_optimize_indices_for_cache>` **(** **)**                                                                                                                                                                                                                                                                                                                                                                                                             |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_bones<class_SurfaceTool_method_set_bones>` **(** :ref:`PackedInt32Array<class_PackedInt32Array>` bones **)**                                                                                                                                                                                                                                                                                                                                                                                         |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_color<class_SurfaceTool_method_set_color>` **(** :ref:`Color<class_Color>` color **)**                                                                                                                                                                                                                                                                                                                                                                                                               |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_custom<class_SurfaceTool_method_set_custom>` **(** :ref:`int<class_int>` channel_index, :ref:`Color<class_Color>` custom_color **)**                                                                                                                                                                                                                                                                                                                                                                 |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_custom_format<class_SurfaceTool_method_set_custom_format>` **(** :ref:`int<class_int>` channel_index, :ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` format **)**                                                                                                                                                                                                                                                                                                                                |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_material<class_SurfaceTool_method_set_material>` **(** :ref:`Material<class_Material>` material **)**                                                                                                                                                                                                                                                                                                                                                                                                |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_normal<class_SurfaceTool_method_set_normal>` **(** :ref:`Vector3<class_Vector3>` normal **)**                                                                                                                                                                                                                                                                                                                                                                                                        |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_skin_weight_count<class_SurfaceTool_method_set_skin_weight_count>` **(** :ref:`SkinWeightCount<enum_SurfaceTool_SkinWeightCount>` count **)**                                                                                                                                                                                                                                                                                                                                                        |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_smooth_group<class_SurfaceTool_method_set_smooth_group>` **(** :ref:`int<class_int>` index **)**                                                                                                                                                                                                                                                                                                                                                                                                     |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_tangent<class_SurfaceTool_method_set_tangent>` **(** :ref:`Plane<class_Plane>` tangent **)**                                                                                                                                                                                                                                                                                                                                                                                                         |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_uv<class_SurfaceTool_method_set_uv>` **(** :ref:`Vector2<class_Vector2>` uv **)**                                                                                                                                                                                                                                                                                                                                                                                                                    |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_uv2<class_SurfaceTool_method_set_uv2>` **(** :ref:`Vector2<class_Vector2>` uv2 **)**                                                                                                                                                                                                                                                                                                                                                                                                                 |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                                     | :ref:`set_weights<class_SurfaceTool_method_set_weights>` **(** :ref:`PackedFloat32Array<class_PackedFloat32Array>` weights **)**                                                                                                                                                                                                                                                                                                                                                                               |
   +----------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

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

----

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

Enumerations
------------

.. _enum_SurfaceTool_CustomFormat:

.. rst-class:: classref-enumeration

enum **CustomFormat**:

.. _class_SurfaceTool_constant_CUSTOM_RGBA8_UNORM:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_RGBA8_UNORM** = ``0``

Limits range of data passed to :ref:`set_custom<class_SurfaceTool_method_set_custom>` to unsigned normalized 0 to 1 stored in 8 bits per channel. See :ref:`Mesh.ARRAY_CUSTOM_RGBA8_UNORM<class_Mesh_constant_ARRAY_CUSTOM_RGBA8_UNORM>`.

.. _class_SurfaceTool_constant_CUSTOM_RGBA8_SNORM:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_RGBA8_SNORM** = ``1``

Limits range of data passed to :ref:`set_custom<class_SurfaceTool_method_set_custom>` to signed normalized -1 to 1 stored in 8 bits per channel. See :ref:`Mesh.ARRAY_CUSTOM_RGBA8_SNORM<class_Mesh_constant_ARRAY_CUSTOM_RGBA8_SNORM>`.

.. _class_SurfaceTool_constant_CUSTOM_RG_HALF:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_RG_HALF** = ``2``

Stores data passed to :ref:`set_custom<class_SurfaceTool_method_set_custom>` as half precision floats, and uses only red and green color channels. See :ref:`Mesh.ARRAY_CUSTOM_RG_HALF<class_Mesh_constant_ARRAY_CUSTOM_RG_HALF>`.

.. _class_SurfaceTool_constant_CUSTOM_RGBA_HALF:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_RGBA_HALF** = ``3``

Stores data passed to :ref:`set_custom<class_SurfaceTool_method_set_custom>` as half precision floats and uses all color channels. See :ref:`Mesh.ARRAY_CUSTOM_RGBA_HALF<class_Mesh_constant_ARRAY_CUSTOM_RGBA_HALF>`.

.. _class_SurfaceTool_constant_CUSTOM_R_FLOAT:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_R_FLOAT** = ``4``

Stores data passed to :ref:`set_custom<class_SurfaceTool_method_set_custom>` as full precision floats, and uses only red color channel. See :ref:`Mesh.ARRAY_CUSTOM_R_FLOAT<class_Mesh_constant_ARRAY_CUSTOM_R_FLOAT>`.

.. _class_SurfaceTool_constant_CUSTOM_RG_FLOAT:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_RG_FLOAT** = ``5``

Stores data passed to :ref:`set_custom<class_SurfaceTool_method_set_custom>` as full precision floats, and uses only red and green color channels. See :ref:`Mesh.ARRAY_CUSTOM_RG_FLOAT<class_Mesh_constant_ARRAY_CUSTOM_RG_FLOAT>`.

.. _class_SurfaceTool_constant_CUSTOM_RGB_FLOAT:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_RGB_FLOAT** = ``6``

Stores data passed to :ref:`set_custom<class_SurfaceTool_method_set_custom>` as full precision floats, and uses only red, green and blue color channels. See :ref:`Mesh.ARRAY_CUSTOM_RGB_FLOAT<class_Mesh_constant_ARRAY_CUSTOM_RGB_FLOAT>`.

.. _class_SurfaceTool_constant_CUSTOM_RGBA_FLOAT:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_RGBA_FLOAT** = ``7``

Stores data passed to :ref:`set_custom<class_SurfaceTool_method_set_custom>` as full precision floats, and uses all color channels. See :ref:`Mesh.ARRAY_CUSTOM_RGBA_FLOAT<class_Mesh_constant_ARRAY_CUSTOM_RGBA_FLOAT>`.

.. _class_SurfaceTool_constant_CUSTOM_MAX:

.. rst-class:: classref-enumeration-constant

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **CUSTOM_MAX** = ``8``

Used to indicate a disabled custom channel.

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

----

.. _enum_SurfaceTool_SkinWeightCount:

.. rst-class:: classref-enumeration

enum **SkinWeightCount**:

.. _class_SurfaceTool_constant_SKIN_4_WEIGHTS:

.. rst-class:: classref-enumeration-constant

:ref:`SkinWeightCount<enum_SurfaceTool_SkinWeightCount>` **SKIN_4_WEIGHTS** = ``0``

Each individual vertex can be influenced by only 4 bone weights.

.. _class_SurfaceTool_constant_SKIN_8_WEIGHTS:

.. rst-class:: classref-enumeration-constant

:ref:`SkinWeightCount<enum_SurfaceTool_SkinWeightCount>` **SKIN_8_WEIGHTS** = ``1``

Each individual vertex can be influenced by up to 8 bone weights.

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

----

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

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

.. _class_SurfaceTool_method_add_index:

.. rst-class:: classref-method

void **add_index** **(** :ref:`int<class_int>` index **)**

Adds a vertex to index array if you are using indexed vertices. Does not need to be called before adding vertices.

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

----

.. _class_SurfaceTool_method_add_triangle_fan:

.. rst-class:: classref-method

void **add_triangle_fan** **(** :ref:`PackedVector3Array<class_PackedVector3Array>` vertices, :ref:`PackedVector2Array<class_PackedVector2Array>` uvs=PackedVector2Array(), :ref:`PackedColorArray<class_PackedColorArray>` colors=PackedColorArray(), :ref:`PackedVector2Array<class_PackedVector2Array>` uv2s=PackedVector2Array(), :ref:`PackedVector3Array<class_PackedVector3Array>` normals=PackedVector3Array(), :ref:`Plane[]<class_Plane>` tangents=[] **)**

Inserts a triangle fan made of array data into :ref:`Mesh<class_Mesh>` being constructed.

Requires the primitive type be set to :ref:`Mesh.PRIMITIVE_TRIANGLES<class_Mesh_constant_PRIMITIVE_TRIANGLES>`.

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

----

.. _class_SurfaceTool_method_add_vertex:

.. rst-class:: classref-method

void **add_vertex** **(** :ref:`Vector3<class_Vector3>` vertex **)**

Specifies the position of current vertex. Should be called after specifying other vertex properties (e.g. Color, UV).

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

----

.. _class_SurfaceTool_method_append_from:

.. rst-class:: classref-method

void **append_from** **(** :ref:`Mesh<class_Mesh>` existing, :ref:`int<class_int>` surface, :ref:`Transform3D<class_Transform3D>` transform **)**

Append vertices from a given :ref:`Mesh<class_Mesh>` surface onto the current vertex array with specified :ref:`Transform3D<class_Transform3D>`.

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

----

.. _class_SurfaceTool_method_begin:

.. rst-class:: classref-method

void **begin** **(** :ref:`PrimitiveType<enum_Mesh_PrimitiveType>` primitive **)**

Called before adding any vertices. Takes the primitive type as an argument (e.g. :ref:`Mesh.PRIMITIVE_TRIANGLES<class_Mesh_constant_PRIMITIVE_TRIANGLES>`).

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

----

.. _class_SurfaceTool_method_clear:

.. rst-class:: classref-method

void **clear** **(** **)**

Clear all information passed into the surface tool so far.

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

----

.. _class_SurfaceTool_method_commit:

.. rst-class:: classref-method

:ref:`ArrayMesh<class_ArrayMesh>` **commit** **(** :ref:`ArrayMesh<class_ArrayMesh>` existing=null, :ref:`int<class_int>` flags=0 **)**

Returns a constructed :ref:`ArrayMesh<class_ArrayMesh>` from current information passed in. If an existing :ref:`ArrayMesh<class_ArrayMesh>` is passed in as an argument, will add an extra surface to the existing :ref:`ArrayMesh<class_ArrayMesh>`.

\ **FIXME:** Document possible values for ``flags``, it changed in 4.0. Likely some combinations of :ref:`ArrayFormat<enum_Mesh_ArrayFormat>`.

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

----

.. _class_SurfaceTool_method_commit_to_arrays:

.. rst-class:: classref-method

:ref:`Array<class_Array>` **commit_to_arrays** **(** **)**

Commits the data to the same format used by :ref:`ArrayMesh.add_surface_from_arrays<class_ArrayMesh_method_add_surface_from_arrays>`. This way you can further process the mesh data using the :ref:`ArrayMesh<class_ArrayMesh>` API.

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

----

.. _class_SurfaceTool_method_create_from:

.. rst-class:: classref-method

void **create_from** **(** :ref:`Mesh<class_Mesh>` existing, :ref:`int<class_int>` surface **)**

Creates a vertex array from an existing :ref:`Mesh<class_Mesh>`.

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

----

.. _class_SurfaceTool_method_create_from_blend_shape:

.. rst-class:: classref-method

void **create_from_blend_shape** **(** :ref:`Mesh<class_Mesh>` existing, :ref:`int<class_int>` surface, :ref:`String<class_String>` blend_shape **)**

Creates a vertex array from the specified blend shape of an existing :ref:`Mesh<class_Mesh>`. This can be used to extract a specific pose from a blend shape.

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

----

.. _class_SurfaceTool_method_deindex:

.. rst-class:: classref-method

void **deindex** **(** **)**

Removes the index array by expanding the vertex array.

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

----

.. _class_SurfaceTool_method_generate_lod:

.. rst-class:: classref-method

:ref:`PackedInt32Array<class_PackedInt32Array>` **generate_lod** **(** :ref:`float<class_float>` nd_threshold, :ref:`int<class_int>` target_index_count=3 **)**

Generates a LOD for a given ``nd_threshold`` in linear units (square root of quadric error metric), using at most ``target_index_count`` indices.

\ *Deprecated.* Unused internally and fails to preserve normals or UVs. Consider using :ref:`ImporterMesh.generate_lods<class_ImporterMesh_method_generate_lods>` instead.

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

----

.. _class_SurfaceTool_method_generate_normals:

.. rst-class:: classref-method

void **generate_normals** **(** :ref:`bool<class_bool>` flip=false **)**

Generates normals from vertices so you do not have to do it manually. If ``flip`` is ``true``, the resulting normals will be inverted. :ref:`generate_normals<class_SurfaceTool_method_generate_normals>` should be called *after* generating geometry and *before* committing the mesh using :ref:`commit<class_SurfaceTool_method_commit>` or :ref:`commit_to_arrays<class_SurfaceTool_method_commit_to_arrays>`. For correct display of normal-mapped surfaces, you will also have to generate tangents using :ref:`generate_tangents<class_SurfaceTool_method_generate_tangents>`.

\ **Note:** :ref:`generate_normals<class_SurfaceTool_method_generate_normals>` only works if the primitive type to be set to :ref:`Mesh.PRIMITIVE_TRIANGLES<class_Mesh_constant_PRIMITIVE_TRIANGLES>`.

\ **Note:** :ref:`generate_normals<class_SurfaceTool_method_generate_normals>` takes smooth groups into account. To generate smooth normals, set the smooth group to a value greater than or equal to ``0`` using :ref:`set_smooth_group<class_SurfaceTool_method_set_smooth_group>` or leave the smooth group at the default of ``0``. To generate flat normals, set the smooth group to ``-1`` using :ref:`set_smooth_group<class_SurfaceTool_method_set_smooth_group>` prior to adding vertices.

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

----

.. _class_SurfaceTool_method_generate_tangents:

.. rst-class:: classref-method

void **generate_tangents** **(** **)**

Generates a tangent vector for each vertex. Requires that each vertex have UVs and normals set already (see :ref:`generate_normals<class_SurfaceTool_method_generate_normals>`).

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

----

.. _class_SurfaceTool_method_get_aabb:

.. rst-class:: classref-method

:ref:`AABB<class_AABB>` **get_aabb** **(** **)** |const|

Returns the axis-aligned bounding box of the vertex positions.

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

----

.. _class_SurfaceTool_method_get_custom_format:

.. rst-class:: classref-method

:ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` **get_custom_format** **(** :ref:`int<class_int>` channel_index **)** |const|

Returns the format for custom ``channel_index`` (currently up to 4). Returns :ref:`CUSTOM_MAX<class_SurfaceTool_constant_CUSTOM_MAX>` if this custom channel is unused.

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

----

.. _class_SurfaceTool_method_get_primitive_type:

.. rst-class:: classref-method

:ref:`PrimitiveType<enum_Mesh_PrimitiveType>` **get_primitive_type** **(** **)** |const|

Returns the type of mesh geometry, such as :ref:`Mesh.PRIMITIVE_TRIANGLES<class_Mesh_constant_PRIMITIVE_TRIANGLES>`.

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

----

.. _class_SurfaceTool_method_get_skin_weight_count:

.. rst-class:: classref-method

:ref:`SkinWeightCount<enum_SurfaceTool_SkinWeightCount>` **get_skin_weight_count** **(** **)** |const|

By default, returns :ref:`SKIN_4_WEIGHTS<class_SurfaceTool_constant_SKIN_4_WEIGHTS>` to indicate only 4 bone influences per vertex are used.

Returns :ref:`SKIN_8_WEIGHTS<class_SurfaceTool_constant_SKIN_8_WEIGHTS>` if up to 8 influences are used.

\ **Note:** This function returns an enum, not the exact number of weights.

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

----

.. _class_SurfaceTool_method_index:

.. rst-class:: classref-method

void **index** **(** **)**

Shrinks the vertex array by creating an index array. This can improve performance by avoiding vertex reuse.

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

----

.. _class_SurfaceTool_method_optimize_indices_for_cache:

.. rst-class:: classref-method

void **optimize_indices_for_cache** **(** **)**

Optimizes triangle sorting for performance. Requires that :ref:`get_primitive_type<class_SurfaceTool_method_get_primitive_type>` is :ref:`Mesh.PRIMITIVE_TRIANGLES<class_Mesh_constant_PRIMITIVE_TRIANGLES>`.

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

----

.. _class_SurfaceTool_method_set_bones:

.. rst-class:: classref-method

void **set_bones** **(** :ref:`PackedInt32Array<class_PackedInt32Array>` bones **)**

Specifies an array of bones to use for the *next* vertex. ``bones`` must contain 4 integers.

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

----

.. _class_SurfaceTool_method_set_color:

.. rst-class:: classref-method

void **set_color** **(** :ref:`Color<class_Color>` color **)**

Specifies a :ref:`Color<class_Color>` to use for the *next* vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.

\ **Note:** The material must have :ref:`BaseMaterial3D.vertex_color_use_as_albedo<class_BaseMaterial3D_property_vertex_color_use_as_albedo>` enabled for the vertex color to be visible.

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

----

.. _class_SurfaceTool_method_set_custom:

.. rst-class:: classref-method

void **set_custom** **(** :ref:`int<class_int>` channel_index, :ref:`Color<class_Color>` custom_color **)**

Sets the custom value on this vertex for ``channel_index``.

\ :ref:`set_custom_format<class_SurfaceTool_method_set_custom_format>` must be called first for this ``channel_index``. Formats which are not RGBA will ignore other color channels.

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.. _class_SurfaceTool_method_set_custom_format:

.. rst-class:: classref-method

void **set_custom_format** **(** :ref:`int<class_int>` channel_index, :ref:`CustomFormat<enum_SurfaceTool_CustomFormat>` format **)**

Sets the color format for this custom ``channel_index``. Use :ref:`CUSTOM_MAX<class_SurfaceTool_constant_CUSTOM_MAX>` to disable.

Must be invoked after :ref:`begin<class_SurfaceTool_method_begin>` and should be set before :ref:`commit<class_SurfaceTool_method_commit>` or :ref:`commit_to_arrays<class_SurfaceTool_method_commit_to_arrays>`.

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.. _class_SurfaceTool_method_set_material:

.. rst-class:: classref-method

void **set_material** **(** :ref:`Material<class_Material>` material **)**

Sets :ref:`Material<class_Material>` to be used by the :ref:`Mesh<class_Mesh>` you are constructing.

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.. _class_SurfaceTool_method_set_normal:

.. rst-class:: classref-method

void **set_normal** **(** :ref:`Vector3<class_Vector3>` normal **)**

Specifies a normal to use for the *next* vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.

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.. _class_SurfaceTool_method_set_skin_weight_count:

.. rst-class:: classref-method

void **set_skin_weight_count** **(** :ref:`SkinWeightCount<enum_SurfaceTool_SkinWeightCount>` count **)**

Set to :ref:`SKIN_8_WEIGHTS<class_SurfaceTool_constant_SKIN_8_WEIGHTS>` to indicate that up to 8 bone influences per vertex may be used.

By default, only 4 bone influences are used (:ref:`SKIN_4_WEIGHTS<class_SurfaceTool_constant_SKIN_4_WEIGHTS>`)

\ **Note:** This function takes an enum, not the exact number of weights.

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.. _class_SurfaceTool_method_set_smooth_group:

.. rst-class:: classref-method

void **set_smooth_group** **(** :ref:`int<class_int>` index **)**

Specifies the smooth group to use for the *next* vertex. If this is never called, all vertices will have the default smooth group of ``0`` and will be smoothed with adjacent vertices of the same group. To produce a mesh with flat normals, set the smooth group to ``-1``.

\ **Note:** This function actually takes a ``uint32_t``, so C# users should use ``uint32.MaxValue`` instead of ``-1`` to produce a mesh with flat normals.

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.. _class_SurfaceTool_method_set_tangent:

.. rst-class:: classref-method

void **set_tangent** **(** :ref:`Plane<class_Plane>` tangent **)**

Specifies a tangent to use for the *next* vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.

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.. _class_SurfaceTool_method_set_uv:

.. rst-class:: classref-method

void **set_uv** **(** :ref:`Vector2<class_Vector2>` uv **)**

Specifies a set of UV coordinates to use for the *next* vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.

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.. _class_SurfaceTool_method_set_uv2:

.. rst-class:: classref-method

void **set_uv2** **(** :ref:`Vector2<class_Vector2>` uv2 **)**

Specifies an optional second set of UV coordinates to use for the *next* vertex. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.

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.. _class_SurfaceTool_method_set_weights:

.. rst-class:: classref-method

void **set_weights** **(** :ref:`PackedFloat32Array<class_PackedFloat32Array>` weights **)**

Specifies weight values to use for the *next* vertex. ``weights`` must contain 4 values. If every vertex needs to have this information set and you fail to submit it for the first vertex, this information may not be used at all.

.. |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.)`
.. |bitfield| replace:: :abbr:`BitField (This value is an integer composed as a bitmask of the following flags.)`