godot-docs/classes/class_gltfdocument.rst

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.. _class_GLTFDocument:

GLTFDocument
============

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

Class for importing and exporting glTF files in and out of Godot.

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

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

GLTFDocument supports reading data from a glTF file, buffer, or Godot scene. This data can then be written to the filesystem, buffer, or used to create a Godot scene.

All of the data in a GLTF scene is stored in the :ref:`GLTFState<class_GLTFState>` class. GLTFDocument processes state objects, but does not contain any scene data itself. GLTFDocument has member variables to store export configuration settings such as the image format, but is otherwise stateless. Multiple scenes can be processed with the same settings using the same GLTFDocument object and different :ref:`GLTFState<class_GLTFState>` objects.

GLTFDocument can be extended with arbitrary functionality by extending the :ref:`GLTFDocumentExtension<class_GLTFDocumentExtension>` class and registering it with GLTFDocument via :ref:`register_gltf_document_extension<class_GLTFDocument_method_register_gltf_document_extension>`. This allows for custom data to be imported and exported.

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Tutorials
---------

- `glTF 'What the duck?' guide <https://www.khronos.org/files/gltf20-reference-guide.pdf>`__

- `Khronos glTF specification <https://registry.khronos.org/glTF/>`__

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Properties
----------

.. table::
   :widths: auto

   +-----------------------------------------------------+-------------------------------------------------------------------+-----------+
   | :ref:`String<class_String>`                         | :ref:`image_format<class_GLTFDocument_property_image_format>`     | ``"PNG"`` |
   +-----------------------------------------------------+-------------------------------------------------------------------+-----------+
   | :ref:`float<class_float>`                           | :ref:`lossy_quality<class_GLTFDocument_property_lossy_quality>`   | ``0.75``  |
   +-----------------------------------------------------+-------------------------------------------------------------------+-----------+
   | :ref:`RootNodeMode<enum_GLTFDocument_RootNodeMode>` | :ref:`root_node_mode<class_GLTFDocument_property_root_node_mode>` | ``0``     |
   +-----------------------------------------------------+-------------------------------------------------------------------+-----------+

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Methods
-------

.. table::
   :widths: auto

   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Error<enum_@GlobalScope_Error>`         | :ref:`append_from_buffer<class_GLTFDocument_method_append_from_buffer>` **(** :ref:`PackedByteArray<class_PackedByteArray>` bytes, :ref:`String<class_String>` base_path, :ref:`GLTFState<class_GLTFState>` state, :ref:`int<class_int>` flags=0 **)**   |
   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Error<enum_@GlobalScope_Error>`         | :ref:`append_from_file<class_GLTFDocument_method_append_from_file>` **(** :ref:`String<class_String>` path, :ref:`GLTFState<class_GLTFState>` state, :ref:`int<class_int>` flags=0, :ref:`String<class_String>` base_path="" **)**                       |
   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Error<enum_@GlobalScope_Error>`         | :ref:`append_from_scene<class_GLTFDocument_method_append_from_scene>` **(** :ref:`Node<class_Node>` node, :ref:`GLTFState<class_GLTFState>` state, :ref:`int<class_int>` flags=0 **)**                                                                   |
   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`PackedByteArray<class_PackedByteArray>` | :ref:`generate_buffer<class_GLTFDocument_method_generate_buffer>` **(** :ref:`GLTFState<class_GLTFState>` state **)**                                                                                                                                    |
   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Node<class_Node>`                       | :ref:`generate_scene<class_GLTFDocument_method_generate_scene>` **(** :ref:`GLTFState<class_GLTFState>` state, :ref:`float<class_float>` bake_fps=30, :ref:`bool<class_bool>` trimming=false, :ref:`bool<class_bool>` remove_immutable_tracks=true **)** |
   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`register_gltf_document_extension<class_GLTFDocument_method_register_gltf_document_extension>` **(** :ref:`GLTFDocumentExtension<class_GLTFDocumentExtension>` extension, :ref:`bool<class_bool>` first_priority=false **)** |static|               |
   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                                          | :ref:`unregister_gltf_document_extension<class_GLTFDocument_method_unregister_gltf_document_extension>` **(** :ref:`GLTFDocumentExtension<class_GLTFDocumentExtension>` extension **)** |static|                                                         |
   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`Error<enum_@GlobalScope_Error>`         | :ref:`write_to_filesystem<class_GLTFDocument_method_write_to_filesystem>` **(** :ref:`GLTFState<class_GLTFState>` state, :ref:`String<class_String>` path **)**                                                                                          |
   +-----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

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

.. _enum_GLTFDocument_RootNodeMode:

.. rst-class:: classref-enumeration

enum **RootNodeMode**:

.. _class_GLTFDocument_constant_ROOT_NODE_MODE_SINGLE_ROOT:

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:ref:`RootNodeMode<enum_GLTFDocument_RootNodeMode>` **ROOT_NODE_MODE_SINGLE_ROOT** = ``0``

Treat the Godot scene's root node as the root node of the glTF file, and mark it as the single root node via the ``GODOT_single_root`` glTF extension. This will be parsed the same as :ref:`ROOT_NODE_MODE_KEEP_ROOT<class_GLTFDocument_constant_ROOT_NODE_MODE_KEEP_ROOT>` if the implementation does not support ``GODOT_single_root``.

.. _class_GLTFDocument_constant_ROOT_NODE_MODE_KEEP_ROOT:

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

:ref:`RootNodeMode<enum_GLTFDocument_RootNodeMode>` **ROOT_NODE_MODE_KEEP_ROOT** = ``1``

Treat the Godot scene's root node as the root node of the glTF file, but do not mark it as anything special. An extra root node will be generated when importing into Godot. This uses only vanilla glTF features. This is equivalent to the behavior in Godot 4.1 and earlier.

.. _class_GLTFDocument_constant_ROOT_NODE_MODE_MULTI_ROOT:

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

:ref:`RootNodeMode<enum_GLTFDocument_RootNodeMode>` **ROOT_NODE_MODE_MULTI_ROOT** = ``2``

Treat the Godot scene's root node as the name of the glTF scene, and add all of its children as root nodes of the glTF file. This uses only vanilla glTF features. This avoids an extra root node, but only the name of the Godot scene's root node will be preserved, as it will not be saved as a node.

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

.. _class_GLTFDocument_property_image_format:

.. rst-class:: classref-property

:ref:`String<class_String>` **image_format** = ``"PNG"``

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

- void **set_image_format** **(** :ref:`String<class_String>` value **)**
- :ref:`String<class_String>` **get_image_format** **(** **)**

The user-friendly name of the export image format. This is used when exporting the GLTF file, including writing to a file and writing to a byte array.

By default, Godot allows the following options: "None", "PNG", "JPEG", "Lossless WebP", and "Lossy WebP". Support for more image formats can be added in :ref:`GLTFDocumentExtension<class_GLTFDocumentExtension>` classes.

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.. _class_GLTFDocument_property_lossy_quality:

.. rst-class:: classref-property

:ref:`float<class_float>` **lossy_quality** = ``0.75``

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

- void **set_lossy_quality** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_lossy_quality** **(** **)**

If :ref:`image_format<class_GLTFDocument_property_image_format>` is a lossy image format, this determines the lossy quality of the image. On a range of ``0.0`` to ``1.0``, where ``0.0`` is the lowest quality and ``1.0`` is the highest quality. A lossy quality of ``1.0`` is not the same as lossless.

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----

.. _class_GLTFDocument_property_root_node_mode:

.. rst-class:: classref-property

:ref:`RootNodeMode<enum_GLTFDocument_RootNodeMode>` **root_node_mode** = ``0``

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

- void **set_root_node_mode** **(** :ref:`RootNodeMode<enum_GLTFDocument_RootNodeMode>` value **)**
- :ref:`RootNodeMode<enum_GLTFDocument_RootNodeMode>` **get_root_node_mode** **(** **)**

How to process the root node during export. See :ref:`RootNodeMode<enum_GLTFDocument_RootNodeMode>` for details. The default and recommended value is :ref:`ROOT_NODE_MODE_SINGLE_ROOT<class_GLTFDocument_constant_ROOT_NODE_MODE_SINGLE_ROOT>`.

\ **Note:** Regardless of how the glTF file is exported, when importing, the root node type and name can be overridden in the scene import settings tab.

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

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

.. _class_GLTFDocument_method_append_from_buffer:

.. rst-class:: classref-method

:ref:`Error<enum_@GlobalScope_Error>` **append_from_buffer** **(** :ref:`PackedByteArray<class_PackedByteArray>` bytes, :ref:`String<class_String>` base_path, :ref:`GLTFState<class_GLTFState>` state, :ref:`int<class_int>` flags=0 **)**

Takes a :ref:`PackedByteArray<class_PackedByteArray>` defining a GLTF and imports the data to the given :ref:`GLTFState<class_GLTFState>` object through the ``state`` parameter.

\ **Note:** The ``base_path`` tells :ref:`append_from_buffer<class_GLTFDocument_method_append_from_buffer>` where to find dependencies and can be empty.

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.. _class_GLTFDocument_method_append_from_file:

.. rst-class:: classref-method

:ref:`Error<enum_@GlobalScope_Error>` **append_from_file** **(** :ref:`String<class_String>` path, :ref:`GLTFState<class_GLTFState>` state, :ref:`int<class_int>` flags=0, :ref:`String<class_String>` base_path="" **)**

Takes a path to a GLTF file and imports the data at that file path to the given :ref:`GLTFState<class_GLTFState>` object through the ``state`` parameter.

\ **Note:** The ``base_path`` tells :ref:`append_from_file<class_GLTFDocument_method_append_from_file>` where to find dependencies and can be empty.

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

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.. _class_GLTFDocument_method_append_from_scene:

.. rst-class:: classref-method

:ref:`Error<enum_@GlobalScope_Error>` **append_from_scene** **(** :ref:`Node<class_Node>` node, :ref:`GLTFState<class_GLTFState>` state, :ref:`int<class_int>` flags=0 **)**

Takes a Godot Engine scene node and exports it and its descendants to the given :ref:`GLTFState<class_GLTFState>` object through the ``state`` parameter.

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.. _class_GLTFDocument_method_generate_buffer:

.. rst-class:: classref-method

:ref:`PackedByteArray<class_PackedByteArray>` **generate_buffer** **(** :ref:`GLTFState<class_GLTFState>` state **)**

Takes a :ref:`GLTFState<class_GLTFState>` object through the ``state`` parameter and returns a GLTF :ref:`PackedByteArray<class_PackedByteArray>`.

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

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.. _class_GLTFDocument_method_generate_scene:

.. rst-class:: classref-method

:ref:`Node<class_Node>` **generate_scene** **(** :ref:`GLTFState<class_GLTFState>` state, :ref:`float<class_float>` bake_fps=30, :ref:`bool<class_bool>` trimming=false, :ref:`bool<class_bool>` remove_immutable_tracks=true **)**

Takes a :ref:`GLTFState<class_GLTFState>` object through the ``state`` parameter and returns a Godot Engine scene node.

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

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.. _class_GLTFDocument_method_register_gltf_document_extension:

.. rst-class:: classref-method

void **register_gltf_document_extension** **(** :ref:`GLTFDocumentExtension<class_GLTFDocumentExtension>` extension, :ref:`bool<class_bool>` first_priority=false **)** |static|

Registers the given :ref:`GLTFDocumentExtension<class_GLTFDocumentExtension>` instance with GLTFDocument. If ``first_priority`` is true, this extension will be run first. Otherwise, it will be run last.

\ **Note:** Like GLTFDocument itself, all GLTFDocumentExtension classes must be stateless in order to function properly. If you need to store data, use the ``set_additional_data`` and ``get_additional_data`` methods in :ref:`GLTFState<class_GLTFState>` or :ref:`GLTFNode<class_GLTFNode>`.

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.. _class_GLTFDocument_method_unregister_gltf_document_extension:

.. rst-class:: classref-method

void **unregister_gltf_document_extension** **(** :ref:`GLTFDocumentExtension<class_GLTFDocumentExtension>` extension **)** |static|

Unregisters the given :ref:`GLTFDocumentExtension<class_GLTFDocumentExtension>` instance.

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

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.. _class_GLTFDocument_method_write_to_filesystem:

.. rst-class:: classref-method

:ref:`Error<enum_@GlobalScope_Error>` **write_to_filesystem** **(** :ref:`GLTFState<class_GLTFState>` state, :ref:`String<class_String>` path **)**

Takes a :ref:`GLTFState<class_GLTFState>` object through the ``state`` parameter and writes a glTF file to the filesystem.

\ **Note:** The extension of the glTF file determines if it is a .glb binary file or a .gltf file.

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