The Lighting window

The Lighting window (menu: Window > Rendering > Lighting Settings) is the main control point for Unity’s lighting features. You can use the Lighting window to configure lighting for your Scene, to adjust settings related to precomputing lighting data, and to optimise your lighting for quality, speed and storage space.

The options available in the Lighting window vary depending on which render pipeline your Project uses.

The Lighting window contains 3 tabs:

• The Scene tab
• The Realtime Lightmaps tab, which is visible only if your Project uses the Built-in Render Pipeline
• The Baked Lightmaps tab

You can perform many of the functions available in this window via scripts, using the LightmapEditorSettings and Lightmapping APIs.

Scene tab

The Scene tab contains lighting-related settings and controls that apply to the current Scene.

Environment

This section contains settings for the Skybox, diffuse lighting and reflections.

Property:		Function:
Skybox Material		A Skybox is a Material that appears behind everything else in the Scene to simulate the sky or other distant background. Use this property to choose the Skybox you want to use for the Scene. The default value is the built-in Default Skybox.
Sun Source		When the Skybox Material is a Procedural Skybox, use this setting to specify a GameObject with a directional Light component to indicate the direction of the sun (or whatever large, distant light source is illuminating your Scene). If this is set to None, the brightest directional light in the Scene is assumed to represent the sun. The default value is None.
Environment Lighting		This section contains settings that affect ambient light in the current Scene.
Source		Use this to define a source color for ambient light in the Scene. The default value is Skybox.
	Skybox	Use the colors of the Skybox set in Skybox Material to determine the ambient light coming from different angles. This allows for more precise effects than Gradient.
	Gradient	Choose separate colors for ambient light from the sky, horizon and ground, and blend smoothly between them.
	Color	Use a flat color for all ambient light.
Intensity Multiplier		Use this to set the brightness of the ambient light in the Scene, defined as a value between 0 and 8. The default value is 1.
Ambient Mode		In the Built-in Render Pipeline, use this to specify which Global Illumination mode should be used to determine ambient light in the Scene. This property is only available when both Realtime Global Illumination and Baked Global Illumination are enabled in the Scene.
	Realtime	Calculate and update ambient light in real-time, using Realtime Global Illumination (deprecated).
	Baked	Precompute the ambient light in the Editor, and then apply it at runtime.
Environment Reflections		This section contains global settings for Reflection Probe baking, and settings that affect global reflections.
Source		Use this setting to specify whether you want to use the Skybox for reflection effects, or a cubemap of your choice. The default value is Skybox.
	Skybox	Select this to use the Skybox as the reflection source.
	Custom	Select this to use a cubemap for reflections.
Resolution		Use this to set the resolution of the Skybox for reflection purposes. This property is visible only when Source is set to Skybox.
Cubemap		Use this to specify the cubemap to use for reflection purposes. This property is visible only when Source is set to Cubemap.
Compression		Use this to define whether or not reflection textures are compressed. The default setting is Auto.
	Auto	The reflection texture is compressed if the compression format is suitable.
	Uncompressed	The reflection texture is stored in memory uncompressed.
	Compressed	The texture is compressed.
Intensity Multiplier		The degree to which the reflection source is visible in reflective objects.
Bounces		A reflection bounce occurs when a reflection from one object is then reflected by another object. Use this property to set how many times the Reflection Probes evaluate bounces back and forth between objects. If this is set to 1, then Unity only takes the initial reflection (from the skybox or cube map specified in the Reflection Source property) into account.

Realtime Lighting

This section is visible only when using the Built-in Render Pipeline. It contains settings related to Realtime Global Illumination using Enlighten (deprecated).

Property:	Function:
Realtime Global Illumination (deprecated)	If this checkbox is ticked, Unity enables Realtime Global Illumination using Enlighten. Note that Enlighten is deprecated, and will soon be removed.

Mixed Lighting

This section contains settings that affect the behavior of Baked Lights and Mixed Lights in your Scene.

Property:		Function:
Baked Global Illumination		When this setting is enabled, Baked lights in the Scene are used for lightmapping only, and Mixed lights behave according to the Lighting Mode setting. When this setting 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 will be used for all Mixed Lights in the Scene. When you change the Lighting Mode, you need to re-bake the Scene. If Auto Generate is enabled in the Lighting window, this happens automatically. If Auto Generate is not enabled, click Generate Lighting to see the updated lighting effect.
	Baked Indirect	Use Baked Indirect Lighting Mode for all Mixed Lights in the current Scene.
	Subtractive	Use Subtractive Lighting Mode for all Mixed Lights in the current Scene. Subtractive Lighting Mode is not supported in the High Definition Render Pipeline (HDRP).
	Shadowmask	Use Shadowmask Lighting Mode for all Mixed Lights in the current Scene. Shadowmask Lighting Mode is not supported in the Universal Render Pipeline (URP).
Realtime Shadow Color		Define the color that Unity uses to render real-time shadows in Subtractive Lighting Mode. This setting is visible only when the Lighting Mode is set to Subtractive.

Lightmapping Settings

This section contains settings related to lightmapping.

Lightmapping settings are specific to each lightmapper backend. To see the settings for a lightmapper, see the documentation on the Progressive CPU Lightmapper, the Progressive GPU Lightmapper (preview), and Enlighten (deprecated).

Other Settings

The Other Settings section contains settings for fog, Halos, Flares and Cookies.

			Property:	Function:
Fog				Enables or disables fog in the Scene. Note that fog is not available with the Deferred rendering path. For deferred rendering, the Post-processing fog effect effect might be suitable.
	Color			Use the color picker to set the color Unity uses to draw fog in the Scene.
	Mode			Define the way in which the fogging accumulates with distance from the camera.
		Linear		Fog density increases linearly with distance.
			Start	Set the distance from the Camera at which the fog starts.
			End	Set the distance from the Camera at which the fog completely obscures Scene GameObjects.
		Exponential		Fog density increases exponentially with distance.
			Density	Use this to control the density of the fog. The fog appears more dense as the Density increases.
		Exponential Squared		Fog density increases faster with distance (exponentially and squared).
			Density	Use this to control the density of the fog. The fog appears more dense as the Density increases.
Halo Texture				Set the Texture you want to use for drawing a Halo around lights.
Halo Strength				Define the visibility of Halos around Lights, from a value between 0 and 1.
Flare Fade Speed				Define the time (in seconds) over which lens flares fade from view after initially appearing. This is set to 3 by default.
Flare Strength				Define the visibility of lens flares from lights, from a value between 0 and 1.
Spot Cookie				Set the Cookie texture you want to use for spot lights.

At the bottom of the Scene tab are the Auto Generate checkbox and the Generate Lighting button.

Property:	Function:
Auto Generate	If Auto Generate is enabled, Unity updates lightmap data automatically as you edit the Scene. Unity usually updates the lightmap data a few seconds after you make a change to the Scene. If Auto Generate is disabled, you must manually update lightmap data.
Generate Lighting	Use the Generate Lighting button to manually update the lightmap data. Use the Generate Lighting button if you want to clear the baked data from the Scene without clearing the GI Cache. This button is enabled only if Auto Generate is disabled.

Debug settings

Property:		Function:
Debug Settings		Settings that help you debug your Scene.
Light Probe Visualization		Use this to filter which Light Probes are visualized in the Scene view. The default value is Only Probes Used By Selection.
	Only Probes Used By Selection	Only Light Probes that affect the current selection are visualized in the Scene view.
	All Probes No Cells	All Light Probes are visualized in the Scene view.
	All Probes With Cells	All Light Probes are visualized in the Scene view, and the tetrahedrons that are used for interpolation of Light Probe data are also displayed.
	Ничего	No Light Probes are visualized in the Scene view.
Display Weights		When enabled, Unity draws a line from the Light Probe used for the active selection to the positions on the tetrahedra used for interpolation. This is a way to debug probe interpolation and placement problems.
Display Occlusion		When enabled, Unity displays occlusion data for Light Probes if the Lighting Mode is set to Shadowmask.

Realtime Lightmaps tab

This tab shows a list of all lightmaps generated by Realtime Global Illumination using Enlighten (deprecated) in the current Scene.

If Realtime Global Illumination is not enabled in your Project, this tab will be empty

Baked Lightmaps tab

This tab shows a list of all lightmaps generated by lightmapper for for the current Scene, along with the Lighting Data Asset. If Baked Global Illumination is not enabled in your Project, this tab will be empty.

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