# Create a low-code custom post-processing effect in URP

> How to use a Full Screen Render Pass to create a low-code custom post-processing effect.

The example on this page shows how to use the Full Screen Render Pass Renderer Feature to create a grayscale custom post-processing effect.

For more information on the Full Screen Render Pass Renderer Feature, refer to the [Full Screen Pass Renderer Feature reference](/engine/6000.3/manual/post-processing-and-full-screen-effects/urp/custom-post-processing/renderer-feature-full-screen-pass.md).

## Prerequisites

This example requires the following:

* A Unity project with the URP package installed.

* The **Scriptable Render Pipeline Settings** property refers to a URP asset (**Edit** > Editor > **Graphics** > **Pipeline Specific Settings**).

## Create a Fullscreen Shader Graph

You must create a Fullscreen Shader Graph to create a custom post-processing effect.

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**.

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**.

3. In the **URP Sample Buffer** node's **Source Buffer** dropdown menu, select **Blit Source**.

4. Add a **Vector 3** node.

5. Assign the **Vector 3** node the following values:

   * **X** = 0.2126
   * **Y** = 0.7152
   * **Z** = 0.0722

6. Add a **Dot Product** node.

7. Connect the nodes as shown below.


   **Grayscale Fullscreen Shader Graph with all nodes connected.:**
   ![](/api/media?file=/engine/6000.3/media/images/grayscale-effect-shader-graph.png)

   | Node                  | Connection                         |
   | --------------------- | ---------------------------------- |
   | **URP Sample Buffer** | **Output** to **Dot Product A**    |
   | **Vector 3**          | **Out** to **Dot Product B**       |
   | **Dot Product**       | **Out** to **Fragment Base Color** |

8. Save your Shader Graph.

9. Create a new Material in your Project. To do this right-click in the Project window and select **Create** > **Material**.

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.

## Use the Material in a Full Screen Pass Renderer Feature

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.

1. Select your project's Universal Renderer.

   If you created your project using the **Universal 3D** template, you can find the Universal Renderers in the following project folder: **Assets** > **Settings** > **Renderers**.

2. In the Inspector, click **Add Renderer Feature** and select **Full Screen Pass Renderer Feature**. For more information on adding Renderer Features refer to [How to add a Renderer Feature to a Renderer](/engine/6000.3/manual/render-pipelines/universal-render-pipeline/customizing-urp/urp-renderer-feature/feature.md).

3. Set the **Pass Material** field to the Material you created with the Fullscreen Shader Graph.

   You can also create the material and its shader directly from the **New** dropdown in this field. For more information, refer to [Full Screen Pass Renderer Feature reference for URP](/engine/6000.3/manual/post-processing-and-full-screen-effects/urp/custom-post-processing/renderer-feature-full-screen-pass.md).

4. Set **Injection Point** to **After Rendering Post Processing**.

5. Set **Requirements** to **Color**.

You should now notice the effect in both Scene view and Game view.


**Example scene with a grayscale custom post-processing effect.:**
![](/api/media?file=/engine/6000.3/media/images/grayscale-custom-effect.png)

## Additional resources

* [Custom rendering and post-processing in URP](/engine/6000.3/manual/render-pipelines/universal-render-pipeline/customizing-urp.md)