新建URP项目，Unity默认测试场景查看变化

Camera

Camera 基础设置解释

  1. 相机堆叠：RenderType

    Camera 特殊功能列举

  2. 分屏相机两个Camera，RenderType都设置成Base，设置ViewportRect即可
    相机分屏

Post-process Volume后处理盒子

  • 添加Volume
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    namespace UnityEngine.Rendering.Universal
    {
        [SerializeField, VolumeComponentMenu("Mypost/ScreenSpacePlaneReflect")]

        public class ScreenSpacePlaneReflection : VolumeComponent
        {
            public BoolParameter on = new BoolParameter(false);
            public ClampedIntParameter RTsize = new ClampedIntParameter(512, 128, 720, false);
            public FloatParameter ReflectHeight = new FloatParameter(0.2f, false);
            public ClampedFloatParameter fadeOutRange = new ClampedFloatParameter(0.3f, 0.0f, 1.0f, false);

            public bool IsActive() => on.value;
            public bool IsTileCompatible() => false;
        }
    }
  • 获得组件： VolumeManager.instance.stack.GetComponent(); //获取自定义的volume组件
  • 目前这种方式还是扩展后处理还是比较困难，由于流程最终走的uber shader，
    加新效果都需要再里面加一个处理，相当于改源码，因此使用RenderFeather添加后处理比较方便

Forward Renderer Data设置说明

Renderer Features

基础Features：Render Objects

  1. 初次理解，在渲染管线的某个时刻，过滤到需要的Object，并覆盖一些特殊设置，如遮挡显示等等
    URP手册

    基础Features：SSAO

    环境遮挡Ambient Occlusion

    自定义Renderer Features

  • 如何创建：
  1. Create / Rendering / URP / RenderFeature
  2. 创建脚本继承自：ScriptableRendererFeature， ScriptableRenderPass
    / Create / Rendering / URP / RenderFeature创建
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    using UnityEngine;
    using UnityEngine.Rendering;
    using UnityEngine.Rendering.Universal;

    public class CustomRenderPassFeature : ScriptableRendererFeature
    {
        class CustomRenderPass : 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)
            {
            }

            // Here you can implement the rendering logic.
            // Use <c>ScriptableRenderContext</c> to issue drawing commands or execute command buffers
            // https://docs.unity3d.com/ScriptReference/Rendering.ScriptableRenderContext.html
            // You don't have to call ScriptableRenderContext.submit, the render pipeline will call it at specific points in the pipeline.
            public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
            {
            }

            // Cleanup any allocated resources that were created during the execution of this render pass.
            public override void OnCameraCleanup(CommandBuffer cmd)
            {
            }
        }

        CustomRenderPass m_ScriptablePass;

        /// <inheritdoc/>
        public override void Create()
        {
            m_ScriptablePass = new CustomRenderPass();

            // Configures where the render pass should be injected.
            m_ScriptablePass.renderPassEvent = RenderPassEvent.AfterRenderingOpaques;
        }

        // Here you can inject one or multiple render passes in the renderer.
        // This method is called when setting up the renderer once per-camera.
        public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
        {
            renderer.EnqueuePass(m_ScriptablePass);
        }
    }


  • 用途：
  1. 实现URP没有提供的后处理效果
  2. 很多效果都可以放在RenderFeather中实现

//贴花 URP Decal Projector

ShaderGraph使用

解析URP默认ShaderGraph

一些URP特殊用法

SAMPLER

  • 官网关于SAMPLER的使用说明
    “Point”, “Linear” or “Trilinear” (required) set up texture filtering mode.

“Clamp”, “Repeat”, “Mirror” or “MirrorOnce” (required) set up texture wrap mode.Wrap modes can be specified per-axis (UVW), e.g. “ClampU_RepeatV”.

“Compare” (optional) set up sampler for depth comparison; use with HLSL SamplerComparisonState type and SampleCmp / SampleCmpLevelZero functions.

  • 使用方式
    sampler_<过滤><UV处理> 形成一个变量名,用这个变量作为参数形成采样
    例如：sampler_LinearClamp 这个表示采样过滤是linear,超过(0,1)用clamp方式采样
    SAMPLER(sampler_LinearClamp);在shader里这样声明变量

采样是这样使用:
float4 cloud = SAMPLE_TEXTURE2D_X(_CloudTex, sampler_LinearClamp, cloud_uv);
也可以这样
_CloudTex.Sample(sampler_LinearClamp, cloud_uv);

  • 定义纹理和纹理采样器
    TEXTURE2D(textureName);
    SAMPLER(sampler_textureName);

TEXTURE2D

  • TEXTURE2D_X(_MainTex);
  • TEXTURE2D_X_FLOAT(_CameraDepthTexture);

CBuffer

Constant Buffer 是GPU中的一处常量缓冲区。 Unity Shader中使用CBUFFER_START和CBUFFER_END来定义缓冲区变量。
当前Unity内部使用的缓冲区有

UnityPerCamera
UnityLighting
UnityShadows
UnityPerDraw
UnityPerFrame
UnityPerMaterial
UnityPerObject
这些缓冲区是根据各自数据的刷新频率来定义的。 例如UnityPerCamera中的数据，仅在渲染的Camera发生变化时刷新。里面存的即是与Camera相关的数据。UnityPerMaterial则在材质球发生变化的时候刷新。

CBuffer

pragma multi_compile

URP 支持变体 ，你可能需要某些功能 #pragma multi_compile 添加以下关键字

_MAIN_LIGHT_SHADOWS

_MAIN_LIGHT_SHADOWS_CASCADE

_ADDITIONAL_LIGHTS_VERTEX

_ADDITIONAL_LIGHTS

_ADDITIONAL_LIGHT_SHADOWS

_SHADOWS_SOFT

_MIXED_LIGHTING_SUBTRACTIVE

https://www.bilibili.com/read/cv7359952/