Tested in:
//UE5/Release-5.1 CL22346211 Crashed with Assertion
//UE5/Release-5.0 CL20979098 Crashed with Assertion
Crash occurs when a Constant Vector 4 and a Screen Position node are passed into a LERP then connected to the Result Node in a Material.
Expected Results:
The results are reflected on the materials or a warning is thrown
Actual Results:
The Editor crashes with an Assertion
Assertion failed: bAllowNonFloat [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Materials\HLSLMaterialDerivativeAutogen.cpp] [Line: 156]
UnrealEditor-Engine!GetDerivType(EMaterialValueType,bool) [HLSLMaterialDerivativeAutogen.cpp:156] UnrealEditor-Engine!FMaterialDerivativeAutogen::GenerateLerpFunc(FHLSLMaterialTranslator &,int,int,int) [HLSLMaterialDerivativeAutogen.cpp:1085] UnrealEditor-Engine!FHLSLMaterialTranslator::Lerp(int,int,int) [HLSLMaterialTranslator.cpp:7963] UnrealEditor-Engine!FHLSLMaterialTranslator::CallExpression(FMaterialExpressionKey,FMaterialCompiler *) [HLSLMaterialTranslator.cpp:3737] UnrealEditor-Engine!FExpressionInput::Compile(FMaterialCompiler *) [MaterialShared.cpp:342] UnrealEditor-Engine!FColorMaterialInput::CompileWithDefault(FMaterialCompiler *,EMaterialProperty) [MaterialShared.cpp:620] UnrealEditor-Engine!UMaterial::CompilePropertyEx(FMaterialCompiler *,FGuid const &) [Material.cpp:5948] UnrealEditor-Engine!UMaterialInterface::CompileProperty(FMaterialCompiler *,EMaterialProperty,unsigned int) [MaterialShared.cpp:4806] UnrealEditor-Engine!FMaterialResource::CompilePropertyAndSetMaterialProperty(EMaterialProperty,FMaterialCompiler *,EShaderFrequency,bool) [Material.cpp:256] UnrealEditor-Engine!FHLSLMaterialTranslator::Translate() [HLSLMaterialTranslator.cpp:840] UnrealEditor-Engine!FMaterial::Translate_Legacy(FMaterialShaderMapId const &,FStaticParameterSet const &,EShaderPlatform,ITargetPlatform const *,FMaterialCompilationOutput &,TRefCountPtr<FSharedShaderCompilerEnvironment> &) [MaterialShared.cpp:2813] UnrealEditor-Engine!FMaterial::BeginCompileShaderMap(FMaterialShaderMapId const &,FStaticParameterSet const &,EShaderPlatform,EMaterialShaderPrecompileMode,ITargetPlatform const *) [MaterialShared.cpp:2902] UnrealEditor-Engine!static bool <lambda_051d949613a39eb8dd496958802ab1b5>::operator() [MaterialShared.cpp:2576] UnrealEditor-Engine!FMaterial::FinishCacheShaders() [MaterialShared.cpp:2710] UnrealEditor-Engine!FMaterial::CacheShaders(EShaderPlatform,EMaterialShaderPrecompileMode,ITargetPlatform const *) [MaterialShared.cpp:2387] UnrealEditor-Engine!UMaterial::CacheResourceShadersForRendering(bool,EMaterialShaderPrecompileMode) [Material.cpp:2302] UnrealEditor-Engine!UMaterial::PostEditChangePropertyInternal(FPropertyChangedEvent &,UMaterial::EPostEditChangeEffectOnShaders) [Material.cpp:4402] UnrealEditor-CoreUObject!UObject::PostEditChange() [Obj.cpp:370] UnrealEditor-MaterialEditor!FMaterialEditor::UpdatePreviewMaterial(bool) [MaterialEditor.cpp:2517] UnrealEditor-MaterialEditor!FMaterialEditor::UpdateMaterialAfterGraphChange() [MaterialEditor.cpp:5915] UnrealEditor-MaterialEditor!FMaterialEditorUtilities::UpdateMaterialAfterGraphChange(UEdGraph const *) [MaterialEditorUtilities.cpp:129] UnrealEditor-UnrealEd!7ffdbd040000 + d03f05 UnrealEditor-GraphEditor!FDragConnection::DroppedOnPin(UE::Math::TVector2<double>,UE::Math::TVector2<double>) [DragConnection.cpp:251] UnrealEditor-GraphEditor!SGraphPin::OnDrop(FGeometry const &,FDragDropEvent const &) [SGraphPin.cpp:860] UnrealEditor-Slate!7ffdd1d70000 + 2a6ed UnrealEditor-Slate!7ffdd1d70000 + e633 UnrealEditor-Slate!7ffdd1d70000 + 76f0a UnrealEditor-Slate!7ffdd1d70000 + 65933 UnrealEditor-Slate!7ffdd1d70000 + 5b60c UnrealEditor-ApplicationCore!FWindowsApplication::ProcessDeferredMessage(FDeferredWindowsMessage const &) [WindowsApplication.cpp:2219] UnrealEditor-ApplicationCore!FWindowsApplication::DeferMessage(TSharedPtr<FWindowsWindow,1> &,HWND__ *,unsigned int,unsigned __int64,__int64,int,int,unsigned int) [WindowsApplication.cpp:2726] UnrealEditor-ApplicationCore!FWindowsApplication::ProcessMessage(HWND__ *,unsigned int,unsigned __int64,__int64) [WindowsApplication.cpp:1895] UnrealEditor-ApplicationCore!FWindowsApplication::AppWndProc(HWND__ *,unsigned int,unsigned __int64,__int64) [WindowsApplication.cpp:925] USER32!7ffe63aa0000 + e858 USER32!7ffe63aa0000 + e4ee InkObj!7ffd94d10000 + e7e59 atlthunk!7ffe528f0000 + 1028 USER32!7ffe63aa0000 + e858 USER32!7ffe63aa0000 + e299 UnrealEditor-ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages(bool) [WindowsPlatformApplicationMisc.cpp:142] UnrealEditor!7ff76ae40000 + 734b UnrealEditor!7ff76ae40000 + 227cd UnrealEditor!7ff76ae40000 + 228ba UnrealEditor!7ff76ae40000 + 255d0 UnrealEditor!7ff76ae40000 + 36f34 UnrealEditor!7ff76ae40000 + 3a296 KERNEL32!7ffe64950000 + 17034 ntdll!7ffe655b0000 + 526a1
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-167126 in the post.
| 1 |
| Component | UE - Rendering Architecture - Materials |
|---|---|
| Affects Versions | 5.1 |
| Target Fix | 5.2 |
| Created | Oct 13, 2022 |
|---|---|
| Resolved | Dec 6, 2022 |
| Updated | Feb 4, 2023 |