godot-docs/classes/class_gltfbufferview.rst

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.. _class_GLTFBufferView:

GLTFBufferView
==============

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

Represents a glTF buffer view.

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

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

GLTFBufferView is a data structure representing a glTF ``bufferView`` that would be found in the ``"bufferViews"`` array. A buffer is a blob of binary data. A buffer view is a slice of a buffer that can be used to identify and extract data from the buffer.

Most custom uses of buffers only need to use the :ref:`buffer<class_GLTFBufferView_property_buffer>`, :ref:`byte_length<class_GLTFBufferView_property_byte_length>`, and :ref:`byte_offset<class_GLTFBufferView_property_byte_offset>`. The :ref:`byte_stride<class_GLTFBufferView_property_byte_stride>` and :ref:`indices<class_GLTFBufferView_property_indices>` properties are for more advanced use cases such as interleaved mesh data encoded for the GPU.

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

Tutorials
---------

- `Buffers, BufferViews, and Accessors in Khronos glTF specification <https://github.com/KhronosGroup/glTF-Tutorials/blob/master/gltfTutorial/gltfTutorial_005_BuffersBufferViewsAccessors.md>`__

- :doc:`Runtime file loading and saving <../tutorials/io/runtime_file_loading_and_saving>`

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Properties
----------

.. table::
   :widths: auto

   +-------------------------+---------------------------------------------------------------------------+-----------+
   | :ref:`int<class_int>`   | :ref:`buffer<class_GLTFBufferView_property_buffer>`                       | ``-1``    |
   +-------------------------+---------------------------------------------------------------------------+-----------+
   | :ref:`int<class_int>`   | :ref:`byte_length<class_GLTFBufferView_property_byte_length>`             | ``0``     |
   +-------------------------+---------------------------------------------------------------------------+-----------+
   | :ref:`int<class_int>`   | :ref:`byte_offset<class_GLTFBufferView_property_byte_offset>`             | ``0``     |
   +-------------------------+---------------------------------------------------------------------------+-----------+
   | :ref:`int<class_int>`   | :ref:`byte_stride<class_GLTFBufferView_property_byte_stride>`             | ``-1``    |
   +-------------------------+---------------------------------------------------------------------------+-----------+
   | :ref:`bool<class_bool>` | :ref:`indices<class_GLTFBufferView_property_indices>`                     | ``false`` |
   +-------------------------+---------------------------------------------------------------------------+-----------+
   | :ref:`bool<class_bool>` | :ref:`vertex_attributes<class_GLTFBufferView_property_vertex_attributes>` | ``false`` |
   +-------------------------+---------------------------------------------------------------------------+-----------+

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Methods
-------

.. table::
   :widths: auto

   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`PackedByteArray<class_PackedByteArray>` | :ref:`load_buffer_view_data<class_GLTFBufferView_method_load_buffer_view_data>`\ (\ state\: :ref:`GLTFState<class_GLTFState>`\ ) |const| |
   +-----------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+

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----

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

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

.. _class_GLTFBufferView_property_buffer:

.. rst-class:: classref-property

:ref:`int<class_int>` **buffer** = ``-1`` :ref:`🔗<class_GLTFBufferView_property_buffer>`

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

- |void| **set_buffer**\ (\ value\: :ref:`int<class_int>`\ )
- :ref:`int<class_int>` **get_buffer**\ (\ )

The index of the buffer this buffer view is referencing. If ``-1``, this buffer view is not referencing any buffer.

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

----

.. _class_GLTFBufferView_property_byte_length:

.. rst-class:: classref-property

:ref:`int<class_int>` **byte_length** = ``0`` :ref:`🔗<class_GLTFBufferView_property_byte_length>`

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

- |void| **set_byte_length**\ (\ value\: :ref:`int<class_int>`\ )
- :ref:`int<class_int>` **get_byte_length**\ (\ )

The length, in bytes, of this buffer view. If ``0``, this buffer view is empty.

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

----

.. _class_GLTFBufferView_property_byte_offset:

.. rst-class:: classref-property

:ref:`int<class_int>` **byte_offset** = ``0`` :ref:`🔗<class_GLTFBufferView_property_byte_offset>`

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

- |void| **set_byte_offset**\ (\ value\: :ref:`int<class_int>`\ )
- :ref:`int<class_int>` **get_byte_offset**\ (\ )

The offset, in bytes, from the start of the buffer to the start of this buffer view.

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

----

.. _class_GLTFBufferView_property_byte_stride:

.. rst-class:: classref-property

:ref:`int<class_int>` **byte_stride** = ``-1`` :ref:`🔗<class_GLTFBufferView_property_byte_stride>`

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

- |void| **set_byte_stride**\ (\ value\: :ref:`int<class_int>`\ )
- :ref:`int<class_int>` **get_byte_stride**\ (\ )

The stride, in bytes, between interleaved data. If ``-1``, this buffer view is not interleaved.

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

----

.. _class_GLTFBufferView_property_indices:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **indices** = ``false`` :ref:`🔗<class_GLTFBufferView_property_indices>`

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

- |void| **set_indices**\ (\ value\: :ref:`bool<class_bool>`\ )
- :ref:`bool<class_bool>` **get_indices**\ (\ )

``true`` if the GLTFBufferView's OpenGL GPU buffer type is an ``ELEMENT_ARRAY_BUFFER`` used for vertex indices (integer constant ``34963``). ``false`` if the buffer type is any other value. See `Buffers, BufferViews, and Accessors <https://github.com/KhronosGroup/glTF-Tutorials/blob/master/gltfTutorial/gltfTutorial_005_BuffersBufferViewsAccessors.md>`__ for possible values. This property is set on import and used on export.

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----

.. _class_GLTFBufferView_property_vertex_attributes:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **vertex_attributes** = ``false`` :ref:`🔗<class_GLTFBufferView_property_vertex_attributes>`

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

- |void| **set_vertex_attributes**\ (\ value\: :ref:`bool<class_bool>`\ )
- :ref:`bool<class_bool>` **get_vertex_attributes**\ (\ )

``true`` if the GLTFBufferView's OpenGL GPU buffer type is an ``ARRAY_BUFFER`` used for vertex attributes (integer constant ``34962``). ``false`` if the buffer type is any other value. See `Buffers, BufferViews, and Accessors <https://github.com/KhronosGroup/glTF-Tutorials/blob/master/gltfTutorial/gltfTutorial_005_BuffersBufferViewsAccessors.md>`__ for possible values. This property is set on import and used on export.

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----

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

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

.. _class_GLTFBufferView_method_load_buffer_view_data:

.. rst-class:: classref-method

:ref:`PackedByteArray<class_PackedByteArray>` **load_buffer_view_data**\ (\ state\: :ref:`GLTFState<class_GLTFState>`\ ) |const| :ref:`🔗<class_GLTFBufferView_method_load_buffer_view_data>`

Loads the buffer view data from the buffer referenced by this buffer view in the given :ref:`GLTFState<class_GLTFState>`. Interleaved data with a byte stride is not yet supported by this method. The data is returned as a :ref:`PackedByteArray<class_PackedByteArray>`.

.. |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.)`
.. |void| replace:: :abbr:`void (No return value.)`