102 lines
4.8 KiB
Markdown
102 lines
4.8 KiB
Markdown
# Light Layers
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The Light Layers feature lets you configure certain Lights to affect only specific GameObjects.
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For example, in the following illustration, Light `A` affects Sphere `D`, but not Sphere `C`. Light `B` affects Sphere `C`, but not Sphere `D`.
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To read how to implement this example, see section [How to use Light Layers](#how-to-light-layers).
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## <a name="enable"></a>How to enable Light Layers
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To enable Light Layers in your project:
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1. In the [URP Asset](../universalrp-asset.md), in the **Lighting** section, click the vertical ellipsis icon (⋮) and select **Show Additional Properties**
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2. In the [URP Asset](../universalrp-asset.md), in the **Lighting** section, select **Light Layers**.
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<br/>*URP Asset > Lighting > Light Layers*
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When you enable Light Layers, Unity shows the following extra properties on each Light:
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* General > Light Layer
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* Shadows > Custom Shadow Layers
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## How to edit Light Layer names
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To edit the names of Light Layers:
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1. Go to **Project Settings** > **Graphics** > **URP Global Settings**.
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2. Edit the Light Layer names in the **Light Layer Names (3D)** section.
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<br/>*Graphics > URP Global Settings > Light Layer Names (3D)*
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## <a name="how-to-light-layers"></a>How to use Light Layers
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This section describes how to configure the following application example:
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* The Scene contains two Point Lights (marked `A` and `B` in the illustration) and two Sphere GameObjects (`C` and `D` in the illustration).
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* Light `A` affects Sphere `D`, but not Sphere `C`. Light `B` affects Sphere `C`, but not Sphere `D`.
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The following illustration shows the example:
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<br/>*Light `A` affects Sphere `D`, but not Sphere `C`. Light `B` affects Sphere `C`, but not Sphere `D`.*
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To implement the example:
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1. [Enable Light Layers](#enable) in your project.
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2. Create two Point Lights (call them `A`, and `B`) and two Spheres (call them `C`, and `D`). Position the objects so that both Spheres are within the emission range of Lights.
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3. Go to **Project Settings > Graphics > URP Global Settings**. Rename Light Layer 1 to `Red`, and Light Layer 2 to `Green`.
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4. Select Light `A`, change its color to green. Select Light `B`, change its color to red. With this setup, both Lights affect both Spheres.
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5. Make the following settings on Lights and Spheres:
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Light `A`: in the property **Light > General > Light Layer**, clear all options, and select `Green`.
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Light `B`: in the property **Light > General > Light Layer**, clear all options, and select `Red`.
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Sphere `C`: in the property **Mesh Renderer > Additional Settings > Rendering Layer Mask**, select all options, clear `Green`.
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Sphere `D`: in the property **Mesh Renderer > Additional Settings > Rendering Layer Mask**, select all options, clear `Red`.
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Now Point Light `A` affects Sphere `D`, but not Sphere `C`. Point Light `B` affects Sphere `C`, but not Sphere `D`.
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## <a name="shadow-layers"></a>How to use Custom Shadow Layers
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In the illustration above, Light `A` does not affect Sphere `C`, and the Sphere does not cast shadow from Light `A`.
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The **Custom Shadow Layers** property lets you configure the Scene so that Sphere `C` casts the shadow from Light `A`.
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1. Select Light `A`.
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2. In **Light > Shadows**, select the **Custom Shadow Layers** property. Unity shows the **Layer** property.
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3. In the **Layer** property, select the Light Layer that Sphere C belongs to.
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Now Light `A` does not affect Sphere `C`, but Sphere `C` casts shadow from Light `A`.
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The following illustrations show the Scene with the **Custom Shadow Layers** property off and on.
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