54 lines
3.0 KiB
Markdown
54 lines
3.0 KiB
Markdown
# How to create a custom post-processing effect
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The example on this page shows how to use a Full Screen Render Pass to create a grayscale custom post-processing effect.
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## Prerequisites
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This example requires the following:
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- A Unity project with the URP package installed.
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- The **Scriptable Render Pipeline Settings** property refers to a URP asset (**Project Settings** > **Graphics** > **Scriptable Render Pipeline Settings**).
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## Create a Fullscreen Shader Graph
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You must create a Fullscreen Shader Graph to create a custom post-processing effect.
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1. Create a new Shader Graph in your Project. To do this right-click in the Project window and select **Create** > **Shader Graph** > **URP** > **Fullscreen Shader Graph**.
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2. Add a **URP Sample Buffer** node. To do this right-click in the Shader Graph window, and select **Create Node**. Then locate and select **URP Sample Buffer**.
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3. In the **URP Sample Buffer** node's **Source Buffer** dropdown menu, select **BlitSource**.
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4. Add a **Vector 3** node.
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5. Assign the **Vector 3** node the following values:
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- **X** = 0.2126
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- **Y** = 0.7152
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- **Z** = 0.0722
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6. Add a **Dot Product** node.
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7. Connect the nodes as shown below.
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| Node | Connection |
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| --------------------- | ---------------------------------- |
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| **URP Sample Buffer** | **Output** to **Dot Product A** |
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| **Vector 3** | **Out** to **Dot Product B** |
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| **Dot Product** | **Out** to **Fragment Base Color** |
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8. Save your Shader Graph.
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9. Create a new Material in your Project. To do this right-click in the Project window and select **Create** > **Material**.
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10. Apply the Shader Graph shader to the Material. To do this, open the Material in the Inspector and select **Shader** > **Shader Graphs**, then select the Shader Graph you created in the previous steps.
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## Use the Material in a Full Screen Pass Renderer Feature
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Once you've created a compatible Shader Graph and Material, you can use the Material with a Full Screen Pass Renderer Feature to create a custom post-processing effect.
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1. In the Project window, select a URP Renderer.
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2. In the Inspector, click **Add Renderer Feature** and select **Full Screen Pass Renderer Feature**. For more information on adding Renderer Features see [How to add a Renderer Feature to a Renderer](./../urp-renderer-feature-how-to-add.md).
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3. Set the **Post Process Material** to the Material you created with the Fullscreen Shader Graph.
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4. Set **Injection Point** to **After Rendering Post Processing**.
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5. Set **Requirements** to **Color**.
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You should now see the effect in both Scene view and Game view.
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<br/>*Example scene with a grayscale custom post-processing effect.*
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