解决

1.创建urp资产

创建成功如下图

2.打开Edit > Project Settings… > Graphics

3.设置资产

如果你安装了URP包，当你编写自定义渲染管线时，既是你设置的上图资产也会报同样的错误。

解决办法是卸载URP包。安装自定义可编程渲染管线基础包。Url为 com.unity.render-pipelines.core。复制url到packageManager里面添加基础包。

点击add package from git url ,输入url为com.unity.render-pipelines.core ，然后add

安装完成如下

后面就可以编写自定义渲染管线了

渲染管线资产

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;
[CreateAssetMenu(menuName = "Rendering/MyPipeLineAsset")]
public class MyPipeLineAsset : RenderPipelineAsset
{protected override RenderPipeline CreatePipeline(){return new MyRenderPipeLine();}
}

渲染脚本

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;public class CameraRender
{private ScriptableRenderContext context;private Camera _camera;public void Render(ScriptableRenderContext context, Camera camera){this.context = context;this._camera = camera;Draw();}private void Draw(){// 创建并调度命令以清除当前渲染目标var cmd = new CommandBuffer();cmd.ClearRenderTarget(true, true, Color.black);context.ExecuteCommandBuffer(cmd);cmd.Release();DrawSky();CameraCull();Submit();}private void DrawSky(){context.SetupCameraProperties(_camera);context.DrawSkybox(_camera);}private void CameraCull(){_camera.TryGetCullingParameters(out var parameters);var result = context.Cull(ref parameters);DrawingSettings drawingSettings = new DrawingSettings();drawingSettings.SetShaderPassName(1, new ShaderTagId("SRPDefaultUnlit"));SortingSettings sortingSettings = new SortingSettings();sortingSettings.criteria = SortingCriteria.CommonOpaque;drawingSettings.sortingSettings = sortingSettings;FilteringSettings filteringSettings = new FilteringSettings(RenderQueueRange.opaque);context.DrawRenderers(result, ref drawingSettings, ref filteringSettings);sortingSettings.criteria = SortingCriteria.CommonTransparent;filteringSettings.renderQueueRange = RenderQueueRange.transparent;context.DrawRenderers(result, ref drawingSettings, ref filteringSettings);}private void Submit(){context.Submit();}
}public class MyRenderPipeLine : RenderPipeline
{private CameraRender _cameraRender = new CameraRender();protected override void Render(ScriptableRenderContext context, Camera[] cameras){foreach (var camera in cameras){_cameraRender.Render(context, camera);}}
}