godot-docs/classes/class_visualshadernodeexpression.rst

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.. _class_VisualShaderNodeExpression:

VisualShaderNodeExpression
==========================

**Inherits:** :ref:`VisualShaderNodeGroupBase<class_VisualShaderNodeGroupBase>` **<** :ref:`VisualShaderNodeResizableBase<class_VisualShaderNodeResizableBase>` **<** :ref:`VisualShaderNode<class_VisualShaderNode>` **<** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`

**Inherited By:** :ref:`VisualShaderNodeGlobalExpression<class_VisualShaderNodeGlobalExpression>`

A custom visual shader graph expression written in Godot Shading Language.

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

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

Custom Godot Shading Language expression, with a custom number of input and output ports.

The provided code is directly injected into the graph's matching shader function (``vertex``, ``fragment``, or ``light``), so it cannot be used to declare functions, varyings, uniforms, or global constants. See :ref:`VisualShaderNodeGlobalExpression<class_VisualShaderNodeGlobalExpression>` for such global definitions.

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

Properties
----------

.. table::
   :widths: auto

   +-----------------------------+-------------------------------------------------------------------------+--------+
   | :ref:`String<class_String>` | :ref:`expression<class_VisualShaderNodeExpression_property_expression>` | ``""`` |
   +-----------------------------+-------------------------------------------------------------------------+--------+

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

----

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

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

.. _class_VisualShaderNodeExpression_property_expression:

.. rst-class:: classref-property

:ref:`String<class_String>` **expression** = ``""``

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

- void **set_expression** **(** :ref:`String<class_String>` value **)**
- :ref:`String<class_String>` **get_expression** **(** **)**

An expression in Godot Shading Language, which will be injected at the start of the graph's matching shader function (``vertex``, ``fragment``, or ``light``), and thus cannot be used to declare functions, varyings, uniforms, or global constants.

.. |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.)`