URP 下取消勾选贴图SRGB,

后处理脚本

using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;public class CameraFeature : ScriptableRendererFeature
{public Material Material; //UniversalRenderPipelineAsset_Renderer 面板，设置材质private MyVolumeFeaturePass myPass;public override void Create(){myPass = new MyVolumeFeaturePass();myPass.renderPassEvent = RenderPassEvent.AfterRenderingTransparents;}public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){renderer.EnqueuePass(myPass);myPass.SetValue(renderer.cameraColorTarget, Material); //传递摄像机图像，和材质，给Pass 处理}public class MyVolumeFeaturePass : ScriptableRenderPass{// This method is called before executing the render pass.// It can be used to configure render targets and their clear state. Also to create temporary render target textures.// When empty this render pass will render to the active camera render target.// You should never call CommandBuffer.SetRenderTarget. Instead call <c>ConfigureTarget</c> and <c>ConfigureClear</c>.// The render pipeline will ensure target setup and clearing happens in a performant manner.public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData){}private Material Material;//接受从Feature 面板设置的材质private RenderTargetIdentifier source;//接受相机图像public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){//if (renderingData.cameraData.camera.name != "UIMainCamera")//{//    return;//}//执行后处理if (Material == null){return;}CommandBuffer cmd = CommandBufferPool.Get();//source  //源图像var dec = renderingData.cameraData.cameraTargetDescriptor; //目标图像RenderTargetHandle tempTargetHandle = new RenderTargetHandle();cmd.GetTemporaryRT(tempTargetHandle.id, dec);cmd.Blit(source, tempTargetHandle.Identifier(), Material);//核心命令CommandBuffercmd.Blit(tempTargetHandle.Identifier(), source); //相当于 Graphics.Blitcontext.ExecuteCommandBuffer(cmd);CommandBufferPool.Release(cmd);}public void SetValue(RenderTargetIdentifier source, Material material){Material = material; //接受面板材质this.source = source;}}
}

多重后处理问题

因为没有指定UI相机，导致所有相机画面重复被转换，需要指定仅UI相机进行GammaToLinner转换（也可以在所有渲染之后对图像进行一次GammaToLinner转换）

在Execute函数中暴露相机名在面板上进行填写，判断是否是指定相机，不是指定相机，不进行后处理

         //判断是否是指定相机if (renderingData.cameraData.camera.name != cameraName){return;}

在Redner Feature 面板填入相机名

效果对比

完整参考代码

CameraFeature

using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;public class CameraFeature : ScriptableRendererFeature
{public Material Material; //UniversalRenderPipelineAsset_Renderer 面板，设置材质private MyVolumeFeaturePass myPass;public string CameraName="";public override void Create(){myPass = new MyVolumeFeaturePass();myPass.renderPassEvent = RenderPassEvent.AfterRenderingTransparents;}public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData){renderer.EnqueuePass(myPass);myPass.SetValue(renderer.cameraColorTarget, Material, CameraName); //传递摄像机图像，和材质，给Pass 处理}public class MyVolumeFeaturePass : ScriptableRenderPass{// This method is called before executing the render pass.// It can be used to configure render targets and their clear state. Also to create temporary render target textures.// When empty this render pass will render to the active camera render target.// You should never call CommandBuffer.SetRenderTarget. Instead call <c>ConfigureTarget</c> and <c>ConfigureClear</c>.// The render pipeline will ensure target setup and clearing happens in a performant manner.public override void OnCameraSetup(CommandBuffer cmd, ref RenderingData renderingData){}private Material material;//接受从Feature 面板设置的材质private RenderTargetIdentifier source;//接受相机图像private string cameraName;public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData){//判断是否是指定相机if (renderingData.cameraData.camera.name != cameraName){return;}//执行后处理if (material == null){return;}CommandBuffer cmd = CommandBufferPool.Get();//source  //源图像var dec = renderingData.cameraData.cameraTargetDescriptor; //目标图像RenderTargetHandle tempTargetHandle = new RenderTargetHandle();cmd.GetTemporaryRT(tempTargetHandle.id, dec);cmd.Blit(source, tempTargetHandle.Identifier(), material);//核心命令CommandBuffercmd.Blit(tempTargetHandle.Identifier(), source); //相当于 Graphics.Blitcontext.ExecuteCommandBuffer(cmd);CommandBufferPool.Release(cmd);}public void SetValue(RenderTargetIdentifier source, Material material, string cameraName){this.material = material; //接受面板材质this.source = source;this.cameraName = cameraName;}}
}

PostGammaToLinner Shader

使用Amplify 连一个，其中_MainTex是必须的

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