Injection points reference for URP

URP contains multiple injection points that let you inject render passes at different points in the frame rendering loop.

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URP contains multiple injection points that let you inject render passes into the frame rendering loop and execute them upon different events.

Injection points give a custom render pass access to URP buffers. A render pass has read and write access to all buffers at each injection point.

Unity provides the following events in the rendering loop. You can use these events to inject your custom passes.

Injection point	Description
BeforeRendering	Executes a `ScriptableRenderPass` instance before rendering any other passes in the pipeline for the current Camera. Camera matrices and stereo rendering are not set up at this point. You can use this injection point to draw to custom input textures used later in the pipeline, for example, LUT textures.
BeforeRenderingShadows	Executes a `ScriptableRenderPass` instance before rendering shadow maps (MainLightShadow, AdditionalLightsShadow passes). Camera matrices and stereo rendering are not set up at this point.
AfterRenderingShadows	Executes a `ScriptableRenderPass` instance after rendering shadow maps (MainLightShadow, AdditionalLightsShadow passes). Camera matrices and stereo rendering are not set up this point.
BeforeRenderingPrePasses	Executes a `ScriptableRenderPass` instance before rendering prepasses (DepthPrepass, DepthNormalPrepass passes). Camera matrices and stereo rendering are already set up at this point.
AfterRenderingPrePasses	Executes a `ScriptableRenderPass` instance after rendering prepasses (DepthPrepass, DepthNormalPrepass passes). Camera matrices and stereo rendering are set up at this point.
BeforeRenderingGbuffer	Executes a `ScriptableRenderPass` instance before rendering the GBuffer pass.
AfterRenderingGbuffer	Executes a `ScriptableRenderPass` instance after rendering the GBuffer pass.
BeforeRenderingDeferredLights	Executes a `ScriptableRenderPass` instance before rendering the Deferred pass.
AfterRenderingDeferredLights	Executes a `ScriptableRenderPass` instance after rendering the Deferred pass.
BeforeRenderingOpaques	Executes a `ScriptableRenderPass` instance before rendering opaque objects (DrawOpaqueObjects pass).
AfterRenderingOpaques	Executes a `ScriptableRenderPass` instance after rendering opaque objects (DrawOpaqueObjects pass).
BeforeRenderingSkybox	Executes a `ScriptableRenderPass` instance before rendering the skybox (Camera.RenderSkybox pass).
AfterRenderingSkybox	Executes a `ScriptableRenderPass` instance after rendering the skybox (Camera.RenderSkybox pass).
BeforeRenderingTransparents	Executes a `ScriptableRenderPass` instance before rendering transparent objects (DrawTransparentObjects pass).
AfterRenderingTransparents	Executes a `ScriptableRenderPass` instance after rendering transparent objects (DrawTransparentObjects pass).
BeforeRenderingPostProcessing	Executes a `ScriptableRenderPass` instance before rendering post-processing effects (Render PostProcessing Effects pass).
AfterRenderingPostProcessing	Executes a `ScriptableRenderPass` instance after rendering post-processing effects but before the final blit, post-processing anti-aliasing effects, and color grading.
AfterRendering	Executes `ScriptableRenderPass` instance after rendering all other passes.

The following diagram shows the passes and the flow of frame resources in a URP frame:

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Injection points reference for URP

Injection point

Description