godot-docs/classes/class_physicalskymaterial.rst

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.. _class_PhysicalSkyMaterial:

PhysicalSkyMaterial
===================

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

:ref:`Sky<class_Sky>` :ref:`Material<class_Material>` used for a physically based sky.

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

The ``PhysicalSkyMaterial`` uses the Preetham analytic daylight model to draw a sky based on physical properties. This results in a substantially more realistic sky than the :ref:`ProceduralSkyMaterial<class_ProceduralSkyMaterial>`, but it is slightly slower and less flexible.

The ``PhysicalSkyMaterial`` only supports one sun. The color, energy, and direction of the sun are taken from the first :ref:`DirectionalLight3D<class_DirectionalLight3D>` in the scene tree.

As it is based on a daylight model, the sky fades to black as the sunset ends. If you want a full day/night cycle, you will have to add a night sky by converting this to a :ref:`ShaderMaterial<class_ShaderMaterial>` and adding a night sky directly into the resulting shader.

Properties
----------

+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`float<class_float>`         | :ref:`exposure<class_PhysicalSkyMaterial_property_exposure>`                         | ``0.1``                          |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`Color<class_Color>`         | :ref:`ground_color<class_PhysicalSkyMaterial_property_ground_color>`                 | ``Color(0.1, 0.07, 0.034, 1)``   |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`float<class_float>`         | :ref:`mie_coefficient<class_PhysicalSkyMaterial_property_mie_coefficient>`           | ``0.005``                        |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`Color<class_Color>`         | :ref:`mie_color<class_PhysicalSkyMaterial_property_mie_color>`                       | ``Color(0.69, 0.729, 0.812, 1)`` |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`float<class_float>`         | :ref:`mie_eccentricity<class_PhysicalSkyMaterial_property_mie_eccentricity>`         | ``0.8``                          |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`Texture2D<class_Texture2D>` | :ref:`night_sky<class_PhysicalSkyMaterial_property_night_sky>`                       |                                  |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`float<class_float>`         | :ref:`rayleigh_coefficient<class_PhysicalSkyMaterial_property_rayleigh_coefficient>` | ``2.0``                          |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`Color<class_Color>`         | :ref:`rayleigh_color<class_PhysicalSkyMaterial_property_rayleigh_color>`             | ``Color(0.3, 0.405, 0.6, 1)``    |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`float<class_float>`         | :ref:`sun_disk_scale<class_PhysicalSkyMaterial_property_sun_disk_scale>`             | ``1.0``                          |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`float<class_float>`         | :ref:`turbidity<class_PhysicalSkyMaterial_property_turbidity>`                       | ``10.0``                         |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
| :ref:`bool<class_bool>`           | :ref:`use_debanding<class_PhysicalSkyMaterial_property_use_debanding>`               | ``true``                         |
+-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+

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

.. _class_PhysicalSkyMaterial_property_exposure:

- :ref:`float<class_float>` **exposure**

+-----------+---------------------+
| *Default* | ``0.1``             |
+-----------+---------------------+
| *Setter*  | set_exposure(value) |
+-----------+---------------------+
| *Getter*  | get_exposure()      |
+-----------+---------------------+

Sets the exposure of the sky. Higher exposure values make the entire sky brighter.

----

.. _class_PhysicalSkyMaterial_property_ground_color:

- :ref:`Color<class_Color>` **ground_color**

+-----------+--------------------------------+
| *Default* | ``Color(0.1, 0.07, 0.034, 1)`` |
+-----------+--------------------------------+
| *Setter*  | set_ground_color(value)        |
+-----------+--------------------------------+
| *Getter*  | get_ground_color()             |
+-----------+--------------------------------+

Modulates the :ref:`Color<class_Color>` on the bottom half of the sky to represent the ground.

----

.. _class_PhysicalSkyMaterial_property_mie_coefficient:

- :ref:`float<class_float>` **mie_coefficient**

+-----------+----------------------------+
| *Default* | ``0.005``                  |
+-----------+----------------------------+
| *Setter*  | set_mie_coefficient(value) |
+-----------+----------------------------+
| *Getter*  | get_mie_coefficient()      |
+-----------+----------------------------+

Controls the strength of mie scattering for the sky. Mie scattering results from light colliding with larger particles (like water). On earth, mie scattering results in a whitish color around the sun and horizon.

----

.. _class_PhysicalSkyMaterial_property_mie_color:

- :ref:`Color<class_Color>` **mie_color**

+-----------+----------------------------------+
| *Default* | ``Color(0.69, 0.729, 0.812, 1)`` |
+-----------+----------------------------------+
| *Setter*  | set_mie_color(value)             |
+-----------+----------------------------------+
| *Getter*  | get_mie_color()                  |
+-----------+----------------------------------+

Controls the :ref:`Color<class_Color>` of the mie scattering effect. While not physically accurate, this allows for the creation of alien-looking planets.

----

.. _class_PhysicalSkyMaterial_property_mie_eccentricity:

- :ref:`float<class_float>` **mie_eccentricity**

+-----------+-----------------------------+
| *Default* | ``0.8``                     |
+-----------+-----------------------------+
| *Setter*  | set_mie_eccentricity(value) |
+-----------+-----------------------------+
| *Getter*  | get_mie_eccentricity()      |
+-----------+-----------------------------+

Controls the direction of the mie scattering. A value of ``1`` means that when light hits a particle it's passing through straight forward. A value of ``-1`` means that all light is scatter backwards.

----

.. _class_PhysicalSkyMaterial_property_night_sky:

- :ref:`Texture2D<class_Texture2D>` **night_sky**

+----------+----------------------+
| *Setter* | set_night_sky(value) |
+----------+----------------------+
| *Getter* | get_night_sky()      |
+----------+----------------------+

:ref:`Texture2D<class_Texture2D>` for the night sky. This is added to the sky, so if it is bright enough, it may be visible during the day.

----

.. _class_PhysicalSkyMaterial_property_rayleigh_coefficient:

- :ref:`float<class_float>` **rayleigh_coefficient**

+-----------+---------------------------------+
| *Default* | ``2.0``                         |
+-----------+---------------------------------+
| *Setter*  | set_rayleigh_coefficient(value) |
+-----------+---------------------------------+
| *Getter*  | get_rayleigh_coefficient()      |
+-----------+---------------------------------+

Controls the strength of the Rayleigh scattering. Rayleigh scattering results from light colliding with small particles. It is responsible for the blue color of the sky.

----

.. _class_PhysicalSkyMaterial_property_rayleigh_color:

- :ref:`Color<class_Color>` **rayleigh_color**

+-----------+-------------------------------+
| *Default* | ``Color(0.3, 0.405, 0.6, 1)`` |
+-----------+-------------------------------+
| *Setter*  | set_rayleigh_color(value)     |
+-----------+-------------------------------+
| *Getter*  | get_rayleigh_color()          |
+-----------+-------------------------------+

Controls the :ref:`Color<class_Color>` of the Rayleigh scattering. While not physically accurate, this allows for the creation of alien-looking planets. For example, setting this to a red :ref:`Color<class_Color>` results in a Mars-looking atmosphere with a corresponding blue sunset.

----

.. _class_PhysicalSkyMaterial_property_sun_disk_scale:

- :ref:`float<class_float>` **sun_disk_scale**

+-----------+---------------------------+
| *Default* | ``1.0``                   |
+-----------+---------------------------+
| *Setter*  | set_sun_disk_scale(value) |
+-----------+---------------------------+
| *Getter*  | get_sun_disk_scale()      |
+-----------+---------------------------+

Sets the size of the sun disk. Default value is based on Sol's perceived size from Earth.

----

.. _class_PhysicalSkyMaterial_property_turbidity:

- :ref:`float<class_float>` **turbidity**

+-----------+----------------------+
| *Default* | ``10.0``             |
+-----------+----------------------+
| *Setter*  | set_turbidity(value) |
+-----------+----------------------+
| *Getter*  | get_turbidity()      |
+-----------+----------------------+

Sets the thickness of the atmosphere. High turbidity creates a foggy-looking atmosphere, while a low turbidity results in a clearer atmosphere.

----

.. _class_PhysicalSkyMaterial_property_use_debanding:

- :ref:`bool<class_bool>` **use_debanding**

+-----------+--------------------------+
| *Default* | ``true``                 |
+-----------+--------------------------+
| *Setter*  | set_use_debanding(value) |
+-----------+--------------------------+
| *Getter*  | get_use_debanding()      |
+-----------+--------------------------+

If ``true``, enables debanding. Debanding adds a small amount of noise which helps reduce banding that appears from the smooth changes in color in the sky.

.. |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.)`