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>`

A material that defines a sky for a :ref:`Sky<class_Sky>` resource by a set of physical properties.

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

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.

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

Properties
----------

.. table::
   :widths: auto

   +-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
   | :ref:`float<class_float>`         | :ref:`energy_multiplier<class_PhysicalSkyMaterial_property_energy_multiplier>`       | ``1.0``                          |
   +-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+
   | :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``                         |
   +-----------------------------------+--------------------------------------------------------------------------------------+----------------------------------+

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

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

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

.. _class_PhysicalSkyMaterial_property_energy_multiplier:

.. rst-class:: classref-property

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

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

- void **set_energy_multiplier** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_energy_multiplier** **(** **)**

The sky's overall brightness multiplier. Higher values result in a brighter sky.

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

----

.. _class_PhysicalSkyMaterial_property_ground_color:

.. rst-class:: classref-property

:ref:`Color<class_Color>` **ground_color** = ``Color(0.1, 0.07, 0.034, 1)``

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

- void **set_ground_color** **(** :ref:`Color<class_Color>` value **)**
- :ref:`Color<class_Color>` **get_ground_color** **(** **)**

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

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

----

.. _class_PhysicalSkyMaterial_property_mie_coefficient:

.. rst-class:: classref-property

:ref:`float<class_float>` **mie_coefficient** = ``0.005``

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

- void **set_mie_coefficient** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_mie_coefficient** **(** **)**

Controls the strength of `Mie scattering <https://en.wikipedia.org/wiki/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.

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

----

.. _class_PhysicalSkyMaterial_property_mie_color:

.. rst-class:: classref-property

:ref:`Color<class_Color>` **mie_color** = ``Color(0.69, 0.729, 0.812, 1)``

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

- void **set_mie_color** **(** :ref:`Color<class_Color>` value **)**
- :ref:`Color<class_Color>` **get_mie_color** **(** **)**

Controls the :ref:`Color<class_Color>` of the `Mie scattering <https://en.wikipedia.org/wiki/Mie_scattering>`__ effect. While not physically accurate, this allows for the creation of alien-looking planets.

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

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.. _class_PhysicalSkyMaterial_property_mie_eccentricity:

.. rst-class:: classref-property

:ref:`float<class_float>` **mie_eccentricity** = ``0.8``

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

- void **set_mie_eccentricity** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_mie_eccentricity** **(** **)**

Controls the direction of the `Mie scattering <https://en.wikipedia.org/wiki/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.

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

----

.. _class_PhysicalSkyMaterial_property_night_sky:

.. rst-class:: classref-property

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

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

- void **set_night_sky** **(** :ref:`Texture2D<class_Texture2D>` value **)**
- :ref:`Texture2D<class_Texture2D>` **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.

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

----

.. _class_PhysicalSkyMaterial_property_rayleigh_coefficient:

.. rst-class:: classref-property

:ref:`float<class_float>` **rayleigh_coefficient** = ``2.0``

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

- void **set_rayleigh_coefficient** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_rayleigh_coefficient** **(** **)**

Controls the strength of the `Rayleigh scattering <https://en.wikipedia.org/wiki/Rayleigh_scattering>`__. Rayleigh scattering results from light colliding with small particles. It is responsible for the blue color of the sky.

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

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.. _class_PhysicalSkyMaterial_property_rayleigh_color:

.. rst-class:: classref-property

:ref:`Color<class_Color>` **rayleigh_color** = ``Color(0.3, 0.405, 0.6, 1)``

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

- void **set_rayleigh_color** **(** :ref:`Color<class_Color>` value **)**
- :ref:`Color<class_Color>` **get_rayleigh_color** **(** **)**

Controls the :ref:`Color<class_Color>` of the `Rayleigh scattering <https://en.wikipedia.org/wiki/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.

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

----

.. _class_PhysicalSkyMaterial_property_sun_disk_scale:

.. rst-class:: classref-property

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

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

- void **set_sun_disk_scale** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_sun_disk_scale** **(** **)**

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

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

----

.. _class_PhysicalSkyMaterial_property_turbidity:

.. rst-class:: classref-property

:ref:`float<class_float>` **turbidity** = ``10.0``

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

- void **set_turbidity** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_turbidity** **(** **)**

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

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

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.. _class_PhysicalSkyMaterial_property_use_debanding:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **use_debanding** = ``true``

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

- void **set_use_debanding** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **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.)`
.. |bitfield| replace:: :abbr:`BitField (This value is an integer composed as a bitmask of the following flags.)`