virtualx-engine-docs/_sources/classes/class_giprobe.rst.txt

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.. _class_GIProbe:

GIProbe
=======

**Inherits:** :ref:`VisualInstance<class_VisualInstance>` **<** :ref:`CullInstance<class_CullInstance>` **<** :ref:`Spatial<class_Spatial>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

Real-time global illumination (GI) probe.

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

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

**GIProbe**\ s are used to provide high-quality real-time indirect light to scenes. They precompute the effect of objects that emit light and the effect of static geometry to simulate the behavior of complex light in real-time. **GIProbe**\ s need to be baked before using, however, once baked, dynamic objects will receive light from them. Further, lights can be fully dynamic or baked.

Having **GIProbe**\ s in a scene can be expensive, the quality of the probe can be turned down in exchange for better performance in the :ref:`ProjectSettings<class_ProjectSettings>` using :ref:`ProjectSettings.rendering/quality/voxel_cone_tracing/high_quality<class_ProjectSettings_property_rendering/quality/voxel_cone_tracing/high_quality>`.

\ **Procedural generation:** **GIProbe** can be baked in an exported project, which makes it suitable for procedurally generated or user-built levels as long as all the geometry is generated in advance.

\ **Performance:** **GIProbe** is relatively demanding on the GPU and is not suited to low-end hardware such as integrated graphics (consider :ref:`BakedLightmap<class_BakedLightmap>` instead). To provide a fallback for low-end hardware, consider adding an option to disable **GIProbe** in your project's options menus. A **GIProbe** node can be disabled by hiding it.

\ **Note:** Meshes should have sufficiently thick walls to avoid light leaks (avoid one-sided walls). For interior levels, enclose your level geometry in a sufficiently large box and bridge the loops to close the mesh. To further prevent light leaks, you can also strategically place temporary :ref:`MeshInstance<class_MeshInstance>` nodes with :ref:`GeometryInstance.use_in_baked_light<class_GeometryInstance_property_use_in_baked_light>` enabled. These temporary nodes can then be hidden after baking the **GIProbe** node.

\ **Note:** Due to a renderer limitation, emissive :ref:`ShaderMaterial<class_ShaderMaterial>`\ s cannot emit light when used in a **GIProbe**. Only emissive :ref:`SpatialMaterial<class_SpatialMaterial>`\ s can emit light in a **GIProbe**.

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

Tutorials
---------

- :doc:`GI probes <../tutorials/3d/gi_probes>`

- `Third Person Shooter Demo <https://godotengine.org/asset-library/asset/678>`__

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

Properties
----------

.. table::
   :widths: auto

   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`float<class_float>`             | :ref:`bias<class_GIProbe_property_bias>`                   | ``1.5``                   |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`bool<class_bool>`               | :ref:`compress<class_GIProbe_property_compress>`           | ``false``                 |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`GIProbeData<class_GIProbeData>` | :ref:`data<class_GIProbe_property_data>`                   |                           |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`int<class_int>`                 | :ref:`dynamic_range<class_GIProbe_property_dynamic_range>` | ``4``                     |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`float<class_float>`             | :ref:`energy<class_GIProbe_property_energy>`               | ``1.0``                   |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`Vector3<class_Vector3>`         | :ref:`extents<class_GIProbe_property_extents>`             | ``Vector3( 10, 10, 10 )`` |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`bool<class_bool>`               | :ref:`interior<class_GIProbe_property_interior>`           | ``false``                 |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`float<class_float>`             | :ref:`normal_bias<class_GIProbe_property_normal_bias>`     | ``0.0``                   |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`float<class_float>`             | :ref:`propagation<class_GIProbe_property_propagation>`     | ``0.7``                   |
   +---------------------------------------+------------------------------------------------------------+---------------------------+
   | :ref:`Subdiv<enum_GIProbe_Subdiv>`    | :ref:`subdiv<class_GIProbe_property_subdiv>`               | ``1``                     |
   +---------------------------------------+------------------------------------------------------------+---------------------------+

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

Methods
-------

.. table::
   :widths: auto

   +------+----------------------------------------------------------------------------------------------------------------------------------------------+
   | void | :ref:`bake<class_GIProbe_method_bake>` **(** :ref:`Node<class_Node>` from_node=null, :ref:`bool<class_bool>` create_visual_debug=false **)** |
   +------+----------------------------------------------------------------------------------------------------------------------------------------------+
   | void | :ref:`debug_bake<class_GIProbe_method_debug_bake>` **(** **)**                                                                               |
   +------+----------------------------------------------------------------------------------------------------------------------------------------------+

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

----

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

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

.. _enum_GIProbe_Subdiv:

.. rst-class:: classref-enumeration

enum **Subdiv**:

.. _class_GIProbe_constant_SUBDIV_64:

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

:ref:`Subdiv<enum_GIProbe_Subdiv>` **SUBDIV_64** = ``0``

Use 64 subdivisions. This is the lowest quality setting, but the fastest. Use it if you can, but especially use it on lower-end hardware.

.. _class_GIProbe_constant_SUBDIV_128:

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

:ref:`Subdiv<enum_GIProbe_Subdiv>` **SUBDIV_128** = ``1``

Use 128 subdivisions. This is the default quality setting.

.. _class_GIProbe_constant_SUBDIV_256:

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

:ref:`Subdiv<enum_GIProbe_Subdiv>` **SUBDIV_256** = ``2``

Use 256 subdivisions.

.. _class_GIProbe_constant_SUBDIV_512:

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

:ref:`Subdiv<enum_GIProbe_Subdiv>` **SUBDIV_512** = ``3``

Use 512 subdivisions. This is the highest quality setting, but the slowest. On lower-end hardware, this could cause the GPU to stall.

.. _class_GIProbe_constant_SUBDIV_MAX:

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

:ref:`Subdiv<enum_GIProbe_Subdiv>` **SUBDIV_MAX** = ``4``

Represents the size of the :ref:`Subdiv<enum_GIProbe_Subdiv>` enum.

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

----

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

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

.. _class_GIProbe_property_bias:

.. rst-class:: classref-property

:ref:`float<class_float>` **bias** = ``1.5``

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

- void **set_bias** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_bias** **(** **)**

Offsets the lookup of the light contribution from the **GIProbe**. This can be used to avoid self-shadowing, but may introduce light leaking at higher values. This and :ref:`normal_bias<class_GIProbe_property_normal_bias>` should be played around with to minimize self-shadowing and light leaking.

\ **Note:** ``bias`` should usually be above 1.0 as that is the size of the voxels.

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

----

.. _class_GIProbe_property_compress:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **compress** = ``false``

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

- void **set_compress** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **is_compressed** **(** **)**

*Deprecated.* This property has been deprecated due to known bugs and no longer has any effect when enabled.

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

----

.. _class_GIProbe_property_data:

.. rst-class:: classref-property

:ref:`GIProbeData<class_GIProbeData>` **data**

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

- void **set_probe_data** **(** :ref:`GIProbeData<class_GIProbeData>` value **)**
- :ref:`GIProbeData<class_GIProbeData>` **get_probe_data** **(** **)**

The :ref:`GIProbeData<class_GIProbeData>` resource that holds the data for this **GIProbe**.

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

----

.. _class_GIProbe_property_dynamic_range:

.. rst-class:: classref-property

:ref:`int<class_int>` **dynamic_range** = ``4``

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

- void **set_dynamic_range** **(** :ref:`int<class_int>` value **)**
- :ref:`int<class_int>` **get_dynamic_range** **(** **)**

The maximum brightness that the **GIProbe** will recognize. Brightness will be scaled within this range.

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

----

.. _class_GIProbe_property_energy:

.. rst-class:: classref-property

:ref:`float<class_float>` **energy** = ``1.0``

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

- void **set_energy** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_energy** **(** **)**

Energy multiplier. Makes the lighting contribution from the **GIProbe** brighter.

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

----

.. _class_GIProbe_property_extents:

.. rst-class:: classref-property

:ref:`Vector3<class_Vector3>` **extents** = ``Vector3( 10, 10, 10 )``

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

- void **set_extents** **(** :ref:`Vector3<class_Vector3>` value **)**
- :ref:`Vector3<class_Vector3>` **get_extents** **(** **)**

The size of the area covered by the **GIProbe**. If you make the extents larger without increasing the subdivisions with :ref:`subdiv<class_GIProbe_property_subdiv>`, the size of each cell will increase and result in lower detailed lighting.

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

----

.. _class_GIProbe_property_interior:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **interior** = ``false``

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

- void **set_interior** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **is_interior** **(** **)**

If ``true``, ignores the sky contribution when calculating lighting.

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

----

.. _class_GIProbe_property_normal_bias:

.. rst-class:: classref-property

:ref:`float<class_float>` **normal_bias** = ``0.0``

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

- void **set_normal_bias** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_normal_bias** **(** **)**

Offsets the lookup into the **GIProbe** based on the object's normal direction. Can be used to reduce some self-shadowing artifacts.

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

----

.. _class_GIProbe_property_propagation:

.. rst-class:: classref-property

:ref:`float<class_float>` **propagation** = ``0.7``

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

- void **set_propagation** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_propagation** **(** **)**

How much light propagates through the probe internally. A higher value allows light to spread further.

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

----

.. _class_GIProbe_property_subdiv:

.. rst-class:: classref-property

:ref:`Subdiv<enum_GIProbe_Subdiv>` **subdiv** = ``1``

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

- void **set_subdiv** **(** :ref:`Subdiv<enum_GIProbe_Subdiv>` value **)**
- :ref:`Subdiv<enum_GIProbe_Subdiv>` **get_subdiv** **(** **)**

Number of times to subdivide the grid that the **GIProbe** operates on. A higher number results in finer detail and thus higher visual quality, while lower numbers result in better performance.

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

----

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

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

.. _class_GIProbe_method_bake:

.. rst-class:: classref-method

void **bake** **(** :ref:`Node<class_Node>` from_node=null, :ref:`bool<class_bool>` create_visual_debug=false **)**

Bakes the effect from all :ref:`GeometryInstance<class_GeometryInstance>`\ s marked with :ref:`GeometryInstance.use_in_baked_light<class_GeometryInstance_property_use_in_baked_light>` and :ref:`Light<class_Light>`\ s marked with either :ref:`Light.BAKE_INDIRECT<class_Light_constant_BAKE_INDIRECT>` or :ref:`Light.BAKE_ALL<class_Light_constant_BAKE_ALL>`. If ``create_visual_debug`` is ``true``, after baking the light, this will generate a :ref:`MultiMesh<class_MultiMesh>` that has a cube representing each solid cell with each cube colored to the cell's albedo color. This can be used to visualize the **GIProbe**'s data and debug any issues that may be occurring.

\ **Note:** :ref:`bake<class_GIProbe_method_bake>` works from the editor and in exported projects. This makes it suitable for procedurally generated or user-built levels. Baking a **GIProbe** generally takes from 5 to 20 seconds in most scenes. Reducing :ref:`subdiv<class_GIProbe_property_subdiv>` can speed up baking.

\ **Note:** :ref:`GeometryInstance<class_GeometryInstance>`\ s and :ref:`Light<class_Light>`\ s must be fully ready before :ref:`bake<class_GIProbe_method_bake>` is called. If you are procedurally creating those and some meshes or lights are missing from your baked **GIProbe**, use ``call_deferred("bake")`` instead of calling :ref:`bake<class_GIProbe_method_bake>` directly.

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

----

.. _class_GIProbe_method_debug_bake:

.. rst-class:: classref-method

void **debug_bake** **(** **)**

Calls :ref:`bake<class_GIProbe_method_bake>` with ``create_visual_debug`` enabled.

.. |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.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`