Version: 2020.2
The Lighting window
Lighting Mode

Lighting Settings Asset

A Lighting Settings Asset represents a saved instance of the LightingSettings class, which stores data for the Baked Global Illumination and the Realtime Global Illumination systems. The Unity Editor uses this data when it precomputes lighting data for a Scene that uses one or both of these systems.

You can assign the same Lighting Settings Asset or instance of the LightingSettings class to more than one Scene, which makes it easy to share Global Illumination system settings across multiple Scenes.

Creating a Lighting Settings Asset

There are two ways to create a Lighting Settings Asset in the Unity Editor.

To create a Lighting Settings Asset from the Project view:

  1. In the Project view, either click the add (+) button, or open the context menu and navigate to Create.
  2. Click Lighting Settings. Unity creates a new Lighting Settings Asset in the Project view.

To create and automatically assign Lighting Settings Asset from the Lighting window:

  1. Open the Lighting window (menu: Window > Rendering > Lighting).
  2. Open the Scene tab.
  3. Click New Lighting Asset. Unity creates a new Lighting Settings Asset in the Project view, and immediately assigns it to the active Scene.

You can also create a Lighting Settings Asset from a script. To do this, create an instance of the LightingSettings class and either save it to disk, or assign it to a Scene and save that Scene. For more information and code examples, see the LightingSettings API documentation.

Assigning a Lighting Settings Asset to a Scene

To assign a Lighting Settings Asset to a Scene in the Unity Editor:

  1. Open the Scene that you want to assign the Lighting Settings Asset to.
  2. If you have more than one Scene open, ensure that the Scene that you want to assign the Lighting Settings Asset to is the active Scene.
  3. Open the Lighting window (menu: Window > Rendering > Lighting).
  4. Open the Scene tab.
  5. Either drag the Lighting Settings Asset to the Lighting Settings field, or click the icon to the right of the Lighting Settings field and choose the Lighting Settings Asset from the list.

You can also assign a Lighting Settings Asset to the active Scene from a script. To do this, load the Lighting Settings Asset to obtain an instance of the LightingSettings class, then use the Lightmapping.lightingSettings API to assign that LightingSettings instance to the active Scene. For more information and code examples, see the LightingSettings API documentation.

Viewing and editing the properties of a Lighting Settings Asset

You can view and edit the properties of Lighting Settings Asset in two places in the Unity Editor:

  • In the Project view, if you select a Lighting Settings Asset, you can view and edit its properties in the Inspector.
  • If the active Scene has a Lighting Settings Asset assigned to it, you can view and edit the properties of that Lighting Settings Asset in the Lighting Window’s Scene tab.

You can also read from or write to the properties of a Lighting Settings Asset from a script. To do this, load the Lighting Settings Asset to obtain an instance of theLightingSettings class, and access its properties. For more information and code examples, see the LightingSettings API documentation.

Default LightingSettings data

When a Scene does not have a Lighting Settings Asset assigned to it, Unity uses the default LightingSettings object for that Scene. The default LightingSettings object is an internal, read-only instance of the LightingSettings class.

You cannot make any changes to the LightingSettings data for a Scene that uses the default LightingSettings, but Unity can perform a bake using its settings.

To make changes to the LightingSettings data for a Scene, you must use the Unity Editor to create and assign a Lighting Settings Asset, or use a script to create, configure, and assign a LightingSettings object. For more information and code examples, see the LightingSettings API documentation.

Properties

When you view the Lighting Settings Asset in the Inspector or the Lighting window, the properties that you can view or edit are divided into the following sections:

Realtime Lighting

This section contains settings related to the Realtime Global Illumination system. This section is visible only when using the Built-in Render Pipeline; Realtime Global Illumination is supported only in the Built-in Render Pipeline, and is not supported in URP or HDRP.

Note that the Realtime Global Illumination system is deprecated, and will soon be removed. For more information, see the Unity blog.

プロパティー 説明
Realtime Global Illumination (deprecated) If this checkbox is ticked, Unity enables the Realtime Global Illumination system in Scenes that use this Lighting Settings Asset.
Realtime Environment Lighting Enable this property to use the Realtime Global Illumination system to calculate and update ambient light in real-time. Disable this property to use the Baked Global Illumination system to precompute the ambient light in the Editor, and then apply it at runtime.

This property is only available when both Realtime Global Illumination and Baked Global Illumination are enabled in the Scene.

Mixed Lighting

This section contains settings that affect the behavior of Baked Lights and Mixed Lights in Scenes that use this Lighting Settings Asset.

プロパティー 機能
Baked Global Illumination When this setting is enabled, Unity enables the Baked Global Illumination system for the Scenes that use this Lighting Settings Asset. When this setting is disabled, Unity disables the Baked Global Illumination system for the Scenes that use this Lighting Settings Asset.

When the Baked Global Illumination system is enabled, Unity uses Baked lights in the Scene for lightmapping only, and Mixed lights behave according to the Lighting Mode setting. When the Baked Global Illumination system is disabled, Unity forces all Baked and Mixed lights in the Scene to act as though they were Realtime Lights.
Lighting Mode Specifies which Lighting Mode Unity uses for all Mixed Lights in the Scenes that use this Lighting Settings Asset.

When you change the Lighting Mode, you need to re-bake the lighting data for the Scenes that use this Lighting Settings Asset.
Baked Indirect Use Baked Indirect Lighting Mode for all Mixed Lights in the Scenes that use this Lighting Settings Asset.
Subtractive Use Subtractive Lighting Mode for all Mixed Lights in the Scenes that use this Lighting Settings Asset.

Note that Subtractive Lighting Mode is not supported in the High Definition Render Pipeline (HDRP).
Shadowmask Use Shadowmask Lighting Mode for all Mixed Lights in the Scenes that use this Lighting Settings Asset.

Note that Shadowmask Lighting Mode is not supported in the Universal Render Pipeline (URP).

ライトマップ設定

This section contains settings related to lightmapping.

Lightmapping settings are specific to each lightmapper backend. To see the settings for a lightmapper, see:

Auto Generation

When you view a Lighting Settings Asset in the Inspector, this property is at the top of the Inspector. When you view a Lighting Settings Asset in the Lighting window, this property is at the bottom of the Lighting window, near the Generate Lighting button.

プロパティー 説明
Auto Generate If Auto Generate is enabled, Unity precomputes lighting data automatically when you make changes to the Scene.

This data includes lightmaps for the Baked Global Illumination system, lightmaps for the Realtime Global Illumination system, Light Probes, and Reflection Probes.

Unity usually begins the bake a few seconds after you make a change to the Scene. If Auto Generate is disabled, you must manually invoke a bake yourself, using the Generate Lighting button in the Lighting window, or the Lightmapping.Bake or Lightmapping.BakeAsync APIs.

Note that when you precompute lighting data using Auto Generate, the precomputed lighting data is not stored as Assets in your Project. It is instead stored in memory, and serialized as part of the Scene.
  • Lighting Settings Asset added in 2020.1 NewIn20201
The Lighting window
Lighting Mode