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uid: urp-custom-rendering-pass-workflow-in-urp
---
# Custom render pass workflow in URP

A custom render pass is a way to change how the Universal Render Pipeline (URP) renders a scene or the objects within a scene. A custom render pass contains your own rendering code, which you insert into the rendering pipeline at an injection point.

To add a custom render pass, complete the following tasks:

- [Create the code](#create-code) for a custom render pass using the Scriptable Render Pass API.
- Add the custom render pass to URP's frame rendering loop by [creating a Scriptable Renderer Feature](#create-srf), or [using the `RenderPipelineManager` API](#inject-pass).

## <a name="create-code"></a>Create the code for a custom render pass

To create the code for a custom render pass, write a class that inherits `ScriptableRenderPass`. In the class, use the [render graph API](../render-graph-introduction.md) to tell Unity what textures and render targets to use, and what operations to do on them.

Refer to [Scriptable Render Passes](scriptable-render-passes.md) for more information.

## <a name="create-srf"></a>Create a Scriptable Renderer Feature

To add your custom render pass to URP's frame rendering loop, write a class that inherits `ScriptableRendererFeature`.

The Scriptable Renderer Feature does the following:

1. Creates an instance of the custom render pass you created.
2. Inserts the custom render pass into the rendering pipeline.

Refer to [Inject a pass using a Scriptable Renderer Feature](scriptable-renderer-features/inject-a-pass-using-a-scriptable-renderer-feature.md) for more information.

## <a name="inject-pass"></a>Use the RenderPipelineManager API

To add your custom render pass to URP's frame rendering loop, you can also subscribe a method to one of the events in the [RenderPipelineManager](https://docs.unity3d.com/ScriptReference/Rendering.RenderPipelineManager.html) class.

Refer to [Inject a render pass via scripting](../customize/inject-render-pass-via-script.md) for more information.

## Additional resources

- [Render graph system](../render-graph-introduction.md)
- [Example of a complete Scriptable Renderer Feature](../renderer-features/create-custom-renderer-feature.md)