在之前的章节一直都是改源码的去添加后期Pass每次改源码编译源码时间很长且还要同步给公司同事拉引擎库十分麻烦有没有简单一点的当然有PostProcessing.cpp给我们暴露了拓展接口利用插件对其进行注册即可在PostProcessing.cpp的下列阶段触发执行让我们开始吧for (const TSharedRefISceneViewExtension ViewExtension : View.Family-ViewExtensions) { for (int32 SceneViewPassId 0; SceneViewPassId FirstAfterPass; SceneViewPassId) { const ISceneViewExtension::EPostProcessingPass SceneViewPass static_castISceneViewExtension::EPostProcessingPass(SceneViewPassId); const bool bIsEnabled (SceneViewPass ISceneViewExtension::EPostProcessingPass::ReplacingTonemapper) ? PassSequence.IsEnabled(EPass::Tonemap) : true; ViewExtension-SubscribeToPostProcessingPass(SceneViewPass, View, SceneViewExtensionDelegates[SceneViewPassId], bIsEnabled); } for (int32 SceneViewPassId FirstAfterPass; SceneViewPassId static_castint32(ISceneViewExtension::EPostProcessingPass::MAX); SceneViewPassId) { const ISceneViewExtension::EPostProcessingPass SceneViewPass static_castISceneViewExtension::EPostProcessingPass(SceneViewPassId); const EPass PostProcessingPass TranslatePass(SceneViewPass); ViewExtension-SubscribeToPostProcessingPass( SceneViewPass, View, PassSequence.GetAfterPassCallbacks(PostProcessingPass), PassSequence.IsEnabled(PostProcessingPass)); } }FSceneViewExtensions::NewExtension() ↓ 创建 FAutoRegister ↓ 构造 FLearningPostProcessViewExtension ↓ 调用 FSceneViewExtensionBase(AutoRegister) ↓ 把该实例的弱引用加入全局注册表 ↓ 返回 TSharedRef全局 ViewExtension 注册表 → 调用 IsActiveThisFrame() → 把激活的 Extension 放入 View.Family-ViewExtensions → 渲染阶段调用 SubscribeToPostProcessingPass()这里SubscribeToPostProcessingPass的SceneViewExtensionDelegates[SceneViewPassId]已经分类把对应类型的delegates给绑定好了然后分不同passid在不同阶段执行这段代码的作用是遍历当前 View 的所有 SceneViewExtension询问每个插件想订阅哪些 PostProcess 节点并把插件 Delegate 保存到对应的回调数组中。注意这里只是“注册回调”还没有真正执行插件 Pass。简化成伪代码for (每个插件) { for (每个PostProcess插入点) { 询问插件 “你要不要在这个位置添加回调” } }for (const TSharedRefISceneViewExtension ViewExtension: View.Family-ViewExtensions)遍历所有注册了ViewExtension的接口分界点constexpr int32 FirstAfterPass static_castint32( ISceneViewExtension::EPostProcessingPass::MotionBlur);EPostProcessingPass顺序是BeforeDOF // 0 AfterDOF // 1 TranslucencyAfterDOF // 2 SSRInput // 3 ReplacingTonemapper // 4 MotionBlur // FirstAfterPass Tonemap FXAA SMAA VisualizeDepthOfField前五个位置由PostProcessing.cpp在特定位置手动执行。从 MotionBlur 开始的节点可以统一放进PassSequence。EPostProcessingPass枚举中 MotionBlur编号之前的特殊插件挂载点并且循环当前做的只是询问插件是否订阅ViewExtension-SubscribeToPostProcessingPass(...)同一个 ViewExtension 可以把同一个回调函数绑定到多个阶段不同回调函数绑定到不同阶段。那么一帧内大致是BeforeDOF → OutlineCallback 执行一次 景深处理 AfterDOF → OutlineCallback 再执行一次遍历每一个viewextension然后一个一个问这个阶段要不要绑定要绑定我就subscribe具体是否绑定是上面代码遍历前期的各个postprocess阶段传到ViewExtension里面看是否绑定ViewExtension会实现对应的SubscribeToPostProcessingPass函数里面会判断if(id 是否等于对应阶段是对应阶段才进行注册绑定例如void FLearningPostProcessViewExtension:: SubscribeToPostProcessingPass( EPostProcessingPass PassId, const FSceneView View, FPostProcessingPassDelegateArray InOutPassCallbacks, bool bIsPassEnabled) { if (PassId ! EPostProcessingPass::Tonemap) { return; } if (!bIsPassEnabled) { return; } if (CVarLearningPostProcessEnable.GetValueOnRenderThread() 0) { return; } // 当前 Shader 只编译 SM5 及以上平台。 if (!IsFeatureLevelSupported( View.GetShaderPlatform(), ERHIFeatureLevel::SM5)) { return; } InOutPassCallbacks.Add( FPostProcessingPassDelegate::CreateRaw( this, FLearningPostProcessViewExtension:: PostProcessPassAfterTonemap_RenderThread)); }问所以这里为什么就replacingtonemapper要判断isenable其他直接返回true呢?答因为前面几个并不是“替换某个功能”而是固定的插入位置只有ReplacingTonemapper依赖 Tonemap 本身存在。对应第一类的执行在FScreenPassTexture AddSceneViewExtensionPassChain( FRDGBuilder GraphBuilder, const FViewInfo View, const FPostProcessMaterialInputs InputsTemplate, const FPostProcessingPassDelegateArray Delegates, EPostProcessMaterialInput MaterialInput EPostProcessMaterialInput::SceneColor) { FScreenPassTextureSlice CurrentInput InputsTemplate.GetInput(MaterialInput); FScreenPassTexture Outputs; for (int32 DelegateIndex 0; DelegateIndex Delegates.Num(); DelegateIndex) { FPostProcessMaterialInputs Inputs InputsTemplate; Inputs.SetInput(MaterialInput, CurrentInput); Outputs Delegates[DelegateIndex].Execute(GraphBuilder, View, Inputs); CurrentInput FScreenPassTextureSlice::CreateFromScreenPassTexture(GraphBuilder, Outputs); } if (!Outputs.IsValid()) { Outputs FScreenPassTexture::CopyFromSlice(GraphBuilder, CurrentInput); } return Outputs; }; }第二类的执行之一在const auto AddAfterPass [](EPass InPass, FScreenPassTexture InSceneColor) - FScreenPassTexture { // In some cases (e.g. OCIO color conversion) we want View Extensions to be able to add extra custom post processing after the pass. FPostProcessingPassDelegateArray PassCallbacks PassSequence.GetAfterPassCallbacks(InPass); if (PassCallbacks.Num()) { FPostProcessMaterialInputs InOutPostProcessAfterPassInputs GetPostProcessMaterialInputs(InSceneColor); for (int32 AfterPassCallbackIndex 0; AfterPassCallbackIndex PassCallbacks.Num(); AfterPassCallbackIndex) { InOutPostProcessAfterPassInputs.SetInput(GraphBuilder, EPostProcessMaterialInput::SceneColor, InSceneColor); FAfterPassCallbackDelegate AfterPassCallback PassCallbacks[AfterPassCallbackIndex]; PassSequence.AcceptOverrideIfLastPass(InPass, InOutPostProcessAfterPassInputs.OverrideOutput, AfterPassCallbackIndex); InSceneColor AfterPassCallback.Execute(GraphBuilder, View, InOutPostProcessAfterPassInputs); } } return MoveTemp(InSceneColor); };都是在不同地方然后取出不同的epass类型注册的delegates数组然后执行第一类SceneViewExtensionDelegates[PassId]是PostProcessing.cpp中的局部数组在 BeforeDOF、SSRInput 等特殊位置手动调用。不同位置还可能使用不同输入SceneColor SeparateTranslucency SSRInput CombinedBloom第二类PassSequence.GetAfterPassCallbacks(EPass)数组由PassSequence管理统一通过AddAfterPass()执行。它额外参与最后一个有效 Pass 的判断。OverrideOutput管理。直接写 ViewFamily 最终输出。原生 Pass 启用状态。多个回调串联后的最终输出选择。onst EPass PostProcessingPass TranslatePass(SceneViewPass);例如EPostProcessingPass::MotionBlur → EPass::MotionBlur EPostProcessingPass::Tonemap → EPass::Tonemap EPostProcessingPass::FXAA → EPass::FXAAPassSequence.GetAfterPassCallbacks(PostProcessingPass)意思是在这个Pass执行完之后执行第一个 for 回调放进独立数组之后在 PostProcessing.cpp 的指定代码位置手动执行 第二个 for 回调放进 PassSequence某个 Pass 执行完成后自动接着执行实际代码.uplugin:{ FileVersion: 3, Version: 1, VersionName: 1.0, FriendlyName: Learning Post Process, Description: A minimal Scene View Extension post-processing pass example., Category: Rendering, CreatedBy: Learning, CanContainContent: false, EnabledByDefault: true, Modules: [ { Name: LearningPostProcess, Type: Runtime, LoadingPhase: PostConfigInit } ] }.Build.cs:// Some copyright should be here... using UnrealBuildTool; public class LearningPostProcess : ModuleRules { public LearningPostProcess(ReadOnlyTargetRules Target) : base(Target) { PCHUsage ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs; PublicIncludePaths.AddRange( new string[] { // ... add public include paths required here ... } ); PrivateIncludePaths.AddRange( new string[] { // ... add other private include paths required here ... } ); PublicDependencyModuleNames.AddRange( new string[] { Core, CoreUObject, Engine, RenderCore // ... add other public dependencies that you statically link with here ... } ); PrivateDependencyModuleNames.AddRange( new string[] { Projects, RHI, Renderer // ... add private dependencies that you statically link with here ... } ); DynamicallyLoadedModuleNames.AddRange( new string[] { // ... add any modules that your module loads dynamically here ... } ); } }.LearningPostProcess.cpp:// Copyright Epic Games, Inc. All Rights Reserved. #include LearningPostProcess.h #include LearningPostProcessViewExtension.h #include Engine/Engine.h #include Interfaces/IPluginManager.h #include Misc/CoreDelegates.h #include Misc/Paths.h #include SceneViewExtension.h #include ShaderCore.h void FLearningPostProcessModule::StartupModule() { const TSharedPtrIPlugin Plugin IPluginManager::Get().FindPlugin(TEXT(LearningPostProcess)); checkf( Plugin.IsValid(), TEXT(LearningPostProcess plugin was not found.)); const FString ShaderDirectory FPaths::Combine( Plugin-GetBaseDir(), TEXT(Shaders)); AddShaderSourceDirectoryMapping( TEXT(/Plugin/LearningPostProcess), ShaderDirectory); // PostConfigInit 时 GEngine 可能尚未完成初始化。 if (GEngine ! nullptr) { RegisterViewExtension(); } else { PostEngineInitHandle FCoreDelegates::OnPostEngineInit.AddRaw( this, FLearningPostProcessModule::RegisterViewExtension); } } void FLearningPostProcessModule::ShutdownModule() { if (PostEngineInitHandle.IsValid()) { FCoreDelegates::OnPostEngineInit.Remove( PostEngineInitHandle); PostEngineInitHandle.Reset(); } // SceneViewExtension 系统保存的是弱引用。 // 释放这个强引用即可注销 Extension。 ViewExtension.Reset(); } void FLearningPostProcessModule::RegisterViewExtension() { if (!ViewExtension.IsValid()) { ViewExtension FSceneViewExtensions::NewExtension FLearningPostProcessViewExtension(); } } IMPLEMENT_MODULE( FLearningPostProcessModule, LearningPostProcess)const TSharedPtrIPlugin Plugin IPluginManager::Get().FindPlugin(TEXT(LearningPostProcess));通过全局插件管理器按名称查找LearningPostProcess这个插件得到它的接口指针。const FString ShaderDirectory FPaths::Combine(Plugin-GetBaseDir(), TEXT(Shaders));Plugin-GetBaseDir()返回该插件在磁盘上的根目录例如D:/Project/Plugins/LearningPostProcess/。FPaths::Combine将其与Shaders子目录拼接得到物理路径比如D:/Project/Plugins/LearningPostProcess/Shaders。AddShaderSourceDirectoryMapping( TEXT(/Plugin/LearningPostProcess), ShaderDirectory);核心操作建立一个虚拟路径到物理路径的映射。第一个参数是虚拟路径/Plugin/LearningPostProcess在着色器代码中用它来引用文件。第二个参数是上面拼接出的实际文件夹路径。调用后引擎的着色器预处理器在处理#include时就会把/Plugin/LearningPostProcess/xxx.usf自动转换为ShaderDirectory/xxx.usf。if (GEngine) { RegisterViewExtension(); }GEngine全局引擎指针指向UEngine实例。它是在引擎初始化过程中由UEngine::Init()创建的。在模块的StartupModule()阶段它可能还是nullptr具体取决于模块加载顺序例如在编辑器启动、项目启动等场景。RegisterViewExtension()就是之前在PostProcessing.cpp里面给出的拓展Extension我们需要把插件的给注册进里面else分支如果GEngine还是空则绑定到FCoreDelegates::OnPostEngineInit这个全局委托。该委托会在引擎完全初始化后触发UEngine::Init()结束时广播。AddRaw将一个原始 C 成员函数指针绑定到委托上。返回值PostEngineInitHandle是一个句柄通常用于后续在ShutdownModule()时通过FCoreDelegates::OnPostEngineInit.Remove(Handle)解绑避免悬空指针。virtual void ShutdownModule() override { if (PostEngineInitHandle.IsValid()) { FCoreDelegates::OnPostEngineInit.Remove(PostEngineInitHandle); PostEngineInitHandle.Reset(); } }作用如果在模块启动时GEngine还未初始化我们就绑定了一个委托到OnPostEngineInit。现在模块关闭了必须把这个绑定解除防止委托还在持有指向已释放模块成员的原始指针导致未来触发时崩溃。Remove()从委托列表里移除该句柄对应的绑定。Reset()将句柄本身清空标记为无效。void RegisterViewExtension() { if (!ViewExtension.IsValid()) { ViewExtension FSceneViewExtensions::NewExtension FLearningPostProcessViewExtension(); } }这就是实际创建并注册自定义扩展的地方。IMPLEMENT_MODULE(FLearningPostProcessModule, LearningPostProcess)FLearningPostProcessModule就是我们一直在讨论的那个类其中包含了StartupModule()和ShutdownModule()。这个宏告诉引擎“这是我的模块类请用StartupModule\ShutdownModule来初始化/关闭这个模块。LearningPostProcess.h:// Copyright Epic Games, Inc. All Rights Reserved. #pragma once #include CoreMinimal.h #include Modules/ModuleManager.h class FLearningPostProcessViewExtension; class FLearningPostProcessModule final : public IModuleInterface { public: virtual void StartupModule() override; virtual void ShutdownModule() override; private: void RegisterViewExtension(); FDelegateHandle PostEngineInitHandle; TSharedPtr FLearningPostProcessViewExtension, ESPMode::ThreadSafe ViewExtension; };这里就没啥好讲的就是声明变量LearningPostProcessViewExtension.h:// Copyright Epic Games, Inc. All Rights Reserved. #pragma once #include SceneViewExtension.h class FLearningPostProcessViewExtension final : public FSceneViewExtensionBase { public: explicit FLearningPostProcessViewExtension( const FAutoRegister AutoRegister); virtual bool IsActiveThisFrame_Internal( const FSceneViewExtensionContext Context) const override; virtual void SubscribeToPostProcessingPass( EPostProcessingPass PassId, const FSceneView View, FPostProcessingPassDelegateArray InOutPassCallbacks, bool bIsPassEnabled) override; private: FScreenPassTexture PostProcessPassAfterTonemap_RenderThread( FRDGBuilder GraphBuilder, const FSceneView View, const FPostProcessMaterialInputs Inputs); };在.cpp详细描述具体函数含义LearningPostProcessViewExtension.cpp// Copyright Epic Games, Inc. All Rights Reserved. #include LearningPostProcessViewExtension.h #include DataDrivenShaderPlatformInfo.h #include GlobalShader.h #include HAL/IConsoleManager.h #include PixelShaderUtils.h #include PostProcess/PostProcessMaterialInputs.h #include RenderGraphBuilder.h #include RHIStaticStates.h #include SceneView.h #include ScreenPass.h #include ShaderParameterStruct.h static TAutoConsoleVariableint32 CVarLearningPostProcessEnable( TEXT(r.LearningPostProcess.Enable), 1, TEXT(Enable the LearningPostProcess pass.\n) TEXT(0: Disabled\n) TEXT(1: Enabled), ECVF_RenderThreadSafe); static TAutoConsoleVariablefloat CVarLearningPostProcessIntensity( TEXT(r.LearningPostProcess.Intensity), 0.5f, TEXT(Tint intensity in the range 0 to 1.), ECVF_RenderThreadSafe); static TAutoConsoleVariablefloat CVarLearningPostProcessTintR( TEXT(r.LearningPostProcess.TintR), 1.0f, TEXT(Red component of the tint color.), ECVF_RenderThreadSafe); static TAutoConsoleVariablefloat CVarLearningPostProcessTintG( TEXT(r.LearningPostProcess.TintG), 0.5f, TEXT(Green component of the tint color.), ECVF_RenderThreadSafe); static TAutoConsoleVariablefloat CVarLearningPostProcessTintB( TEXT(r.LearningPostProcess.TintB), 0.5f, TEXT(Blue component of the tint color.), ECVF_RenderThreadSafe); class FLearningPostProcessPS final : public FGlobalShader { public: DECLARE_GLOBAL_SHADER(FLearningPostProcessPS); SHADER_USE_PARAMETER_STRUCT( FLearningPostProcessPS, FGlobalShader); BEGIN_SHADER_PARAMETER_STRUCT(FParameters, ) SHADER_PARAMETER_RDG_TEXTURE( Texture2D, InputTexture) SHADER_PARAMETER_SAMPLER( SamplerState, InputSampler) SHADER_PARAMETER( FScreenTransform, SvPositionToInputTextureUV) SHADER_PARAMETER( FLinearColor, TintColor) SHADER_PARAMETER( float, Intensity) RENDER_TARGET_BINDING_SLOTS() END_SHADER_PARAMETER_STRUCT() static bool ShouldCompilePermutation( const FGlobalShaderPermutationParameters Parameters) { return IsFeatureLevelSupported( Parameters.Platform, ERHIFeatureLevel::SM5); } }; IMPLEMENT_GLOBAL_SHADER( FLearningPostProcessPS, /Plugin/LearningPostProcess/Private/LearningPostProcess.usf, LearningPostProcessPS, SF_Pixel); FLearningPostProcessViewExtension:: FLearningPostProcessViewExtension( const FAutoRegister AutoRegister) : FSceneViewExtensionBase(AutoRegister) { } bool FLearningPostProcessViewExtension:: IsActiveThisFrame_Internal( const FSceneViewExtensionContext Context) const { return CVarLearningPostProcessEnable.GetValueOnAnyThread() ! 0; } void FLearningPostProcessViewExtension:: SubscribeToPostProcessingPass( EPostProcessingPass PassId, const FSceneView View, FPostProcessingPassDelegateArray InOutPassCallbacks, bool bIsPassEnabled) { if (PassId ! EPostProcessingPass::Tonemap) { return; } if (!bIsPassEnabled) { return; } if (CVarLearningPostProcessEnable.GetValueOnRenderThread() 0) { return; } // 当前 Shader 只编译 SM5 及以上平台。 if (!IsFeatureLevelSupported( View.GetShaderPlatform(), ERHIFeatureLevel::SM5)) { return; } InOutPassCallbacks.Add( FPostProcessingPassDelegate::CreateRaw( this, FLearningPostProcessViewExtension:: PostProcessPassAfterTonemap_RenderThread)); } FScreenPassTexture FLearningPostProcessViewExtension:: PostProcessPassAfterTonemap_RenderThread( FRDGBuilder GraphBuilder, const FSceneView View, const FPostProcessMaterialInputs Inputs) { const FScreenPassTexture SceneColor FScreenPassTexture::CopyFromSlice( GraphBuilder, Inputs.GetInput( EPostProcessMaterialInput::SceneColor)); check(SceneColor.IsValid()); // 当这个回调是后处理链最后一个 pass 时 // 引擎会传入 OverrideOutput。 FScreenPassRenderTarget Output Inputs.OverrideOutput; if (!Output.IsValid()) { Output FScreenPassRenderTarget::CreateFromInput( GraphBuilder, SceneColor, View.GetOverwriteLoadAction(), TEXT(LearningPostProcess.Output)); } const FScreenPassTextureViewport InputViewport(SceneColor); const FScreenPassTextureViewport OutputViewport(Output); FLearningPostProcessPS::FParameters* PassParameters GraphBuilder.AllocParameters FLearningPostProcessPS::FParameters(); PassParameters-InputTexture SceneColor.Texture; PassParameters-InputSampler TStaticSamplerState SF_Bilinear, AM_Clamp, AM_Clamp, AM_Clamp::GetRHI(); // SV_POSITION - Output Viewport UV - Input Texture UV。 PassParameters-SvPositionToInputTextureUV FScreenTransform::ChangeTextureBasisFromTo( OutputViewport, FScreenTransform::ETextureBasis::TexelPosition, FScreenTransform::ETextureBasis::ViewportUV) * FScreenTransform::ChangeTextureBasisFromTo( InputViewport, FScreenTransform::ETextureBasis::ViewportUV, FScreenTransform::ETextureBasis::TextureUV); PassParameters-TintColor FLinearColor( CVarLearningPostProcessTintR .GetValueOnRenderThread(), CVarLearningPostProcessTintG .GetValueOnRenderThread(), CVarLearningPostProcessTintB .GetValueOnRenderThread(), 1.0f); PassParameters-Intensity FMath::Clamp( CVarLearningPostProcessIntensity .GetValueOnRenderThread(), 0.0f, 1.0f); PassParameters-RenderTargets[0] Output.GetRenderTargetBinding(); const FGlobalShaderMap* ShaderMap GetGlobalShaderMap( View.GetFeatureLevel()); const TShaderMapRefFLearningPostProcessPS PixelShader(ShaderMap); FPixelShaderUtils::AddFullscreenPass( GraphBuilder, ShaderMap, RDG_EVENT_NAME( LearningPostProcess AfterTonemap), PixelShader, PassParameters, Output.ViewRect); return MoveTemp(Output); }FLearningPostProcessViewExtension:: FLearningPostProcessViewExtension( const FAutoRegister AutoRegister) : FSceneViewExtensionBase(AutoRegister) { }相当于之前在引擎的PS这里面就要对Extension多做一下构造函数函数里面不需要任何逻辑bool FLearningPostProcessViewExtension:: IsActiveThisFrame_Internal( const FSceneViewExtensionContext Context) const { return CVarLearningPostProcessEnable.GetValueOnAnyThread() ! 0; }这是FLearningPostProcessViewExtension继承的FSceneViewExtensionBase里面的ISceneViewExtension的一个受保护的虚函数如果返回false就不会调用资源来执行接下来的逻辑true才会void FLearningPostProcessViewExtension:: SubscribeToPostProcessingPass( EPostProcessingPass PassId, const FSceneView View, FPostProcessingPassDelegateArray InOutPassCallbacks, bool bIsPassEnabled) { if (PassId ! EPostProcessingPass::Tonemap) { return; } if (!bIsPassEnabled) { return; } if (CVarLearningPostProcessEnable.GetValueOnRenderThread() 0) { return; } // 当前 Shader 只编译 SM5 及以上平台。 if (!IsFeatureLevelSupported( View.GetShaderPlatform(), ERHIFeatureLevel::SM5)) { return; } InOutPassCallbacks.Add( FPostProcessingPassDelegate::CreateRaw( this, FLearningPostProcessViewExtension:: PostProcessPassAfterTonemap_RenderThread)); }这里就是看是否是对应Pass阶段Pass是否启用命令行命令行是否启用是否支持对应平台如果都OK那么就绑定到对应的delegate上方便之后对应的epass阶段在postprocessing.cpp里面进行execute执行对应的回调函数FScreenPassTextureFLearningPostProcessViewExtension::PostProcessPassAfterTonemap_RenderThread。剩下这个回调函数就是给PS赋值然后AddFullscreenPass到任务队列LearningPostProcess.usf:// Copyright Epic Games, Inc. All Rights Reserved. #include /Engine/Private/Common.ush #include /Engine/Private/ScreenPass.ush Texture2D InputTexture; SamplerState InputSampler; FScreenTransform SvPositionToInputTextureUV; float4 TintColor; float Intensity; void LearningPostProcessPS( float4 SvPosition : SV_POSITION, out float4 OutColor : SV_Target0) { const float2 UV ApplyScreenTransform( SvPosition.xy, SvPositionToInputTextureUV); const float4 SceneColor Texture2DSample( InputTexture, InputSampler, UV); const float3 TintedColor SceneColor.rgb * TintColor.rgb; OutColor float4( lerp(SceneColor.rgb, TintedColor, saturate(Intensity)), SceneColor.a); }这里的.usf就很简单就是原场景颜色 * 一个我们自定义的颜色即可总体来说就是相对于直接改引擎我们先要在module注册一个ViewExtension第二个就是ViewExtension回调函数的参数FViewInfo变成了FSceneView其他基本保持一致