Unreal Engine Issues and Bug Tracker (UE-113590)

Description

When adding a Material Layer, that has a Static Component Mask Parameter node in it, to a Material Instance, the editor will crash.

The ability to set Material Attribute layers in a Material Instance is not available in 4.25.4, so not marking as a Regression.

Steps to Reproduce

Create a new material
Set the Material to use Material Attributes
Add a Material Attribute Layers node
In the Content Browser, right-click the new material you created
Select Create Material Instance
Right-click in the Content Browser
Navigate to Materials & Textures > Material Layers to create a new Material Layer asset
Open the Material Layer asset
Add a Static Component Mask Parameter node
Open the Material Instance you created
In the Layer Parameters, set the Layer Asset to the Material Layer you created

RESULT:

The engine crashes

EXPECTED:

The user would be able to use a Static Component Mask Parameter node in a Material Layer without crashing

Callstack

 === Critical error: ===
 
 Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 674] 
 Array index out of bounds: 0 from an array of size 0
 
 
 [Callstack] 0x00007ff8caab3b19 KERNELBASE.dll!UnknownFunction []
 [Callstack] 0x00007ff87ec3d066 UE4Editor-Core.dll!ReportAssert() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformCrashContext.cpp:1616]
 [Callstack] 0x00007ff87ec407a8 UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsErrorOutputDevice.cpp:78]
 [Callstack] 0x00007ff87e94e8cd UE4Editor-Core.dll!FOutputDevice::LogfImpl() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\OutputDevice.cpp:61]
 [Callstack] 0x00007ff87e8e5575 UE4Editor-Core.dll!AssertFailedImplV() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:104]
 [Callstack] 0x00007ff87e8e7620 UE4Editor-Core.dll!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:461]
 [Callstack] 0x00007ff87d1e8208 UE4Editor-Engine.dll!DispatchCheckVerify<void,<lambda_a42d0919e8303add9bf9f7b44044abc5> >() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Misc\AssertionMacros.h:165]
 [Callstack] 0x00007ff87c1f946c UE4Editor-Engine.dll!FMaterialCachedExpressionData::UpdateForExpressions() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialCachedData.cpp:528]
 [Callstack] 0x00007ff87c18fc5d UE4Editor-Engine.dll!<lambda_52b30304b52de31a4a8cc5e30d70deca>::operator()() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialCachedData.cpp:222]
 [Callstack] 0x00007ff87c1fabeb UE4Editor-Engine.dll!FMaterialCachedExpressionData::UpdateForFunction() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialCachedData.cpp:239]
 [Callstack] 0x00007ff87c1fac92 UE4Editor-Engine.dll!FMaterialCachedExpressionData::UpdateForLayerFunctions() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialCachedData.cpp:247]
 [Callstack] 0x00007ff87c2895e2 UE4Editor-Engine.dll!UMaterialInstance::UpdateCachedLayerParameters() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstance.cpp:4031]
 [Callstack] 0x00007ff87c27159b UE4Editor-Engine.dll!UMaterialInstance::PostEditChangeProperty() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstance.cpp:4097]
 [Callstack] 0x00007ff87c271dde UE4Editor-Engine.dll!UMaterialInstanceConstant::PostEditChangeProperty() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstanceConstant.cpp:55]
 [Callstack] 0x00007ff8ac234816 UE4Editor-CoreUObject.dll!UObject::PostEditChange() [D:\Build\++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Obj.cpp:342]
 [Callstack] 0x00007ff85b8e75db UE4Editor-MaterialEditor.dll!UMaterialEditingLibrary::UpdateMaterialFunction() [D:\Build\++UE4\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditingLibrary.cpp:915]
 [Callstack] 0x00007ff85b8eb984 UE4Editor-MaterialEditor.dll!FMaterialEditor::UpdateOriginalMaterial() [D:\Build\++UE4\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditor.cpp:2102]
 [Callstack] 0x00007ff85b8b53b2 UE4Editor-MaterialEditor.dll!FMaterialEditor::OnApply() [D:\Build\++UE4\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditor.cpp:2786]
 [Callstack] 0x00007ff85b891436 UE4Editor-MaterialEditor.dll!TBaseSPMethodDelegateInstance<0,FMaterialEditor,0,void __cdecl(void),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:307]
 [Callstack] 0x00007ff87abe0088 UE4Editor-Slate.dll!FUICommandList::ExecuteAction() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Commands\UICommandList.cpp:102]
 [Callstack] 0x00007ff87accf342 UE4Editor-Slate.dll!SToolBarButtonBlock::OnClicked() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\MultiBox\SToolBarButtonBlock.cpp:301]
 [Callstack] 0x00007ff87acabd07 UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
 [Callstack] 0x00007ff87ad4859e UE4Editor-Slate.dll!SButton::ExecuteOnClick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385]
 [Callstack] 0x00007ff87ad6071e UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304]
 [Callstack] 0x00007ff87aba46be UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:378]
 [Callstack] 0x00007ff87ac27f14 UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4815]
 [Callstack] 0x00007ff87ac10337 UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5356]
 [Callstack] 0x00007ff87ac03632 UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5321]
 [Callstack] 0x00007ff8b168bcb5 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2178]
 [Callstack] 0x00007ff8b1679197 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2642]
 [Callstack] 0x00007ff8b168e389 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1046]
 [Callstack] 0x00007ff8b1674310 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:878]
 [Callstack] 0x00007ff8ccf35c1d USER32.dll!UnknownFunction []
 [Callstack] 0x00007ff8ccf35612 USER32.dll!UnknownFunction []
 [Callstack] 0x00007ff8b168f914 UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
 [Callstack] 0x00007ff7c02e8848 UE4Editor.exe!FEngineLoop::Tick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4748]
 [Callstack] 0x00007ff7c030117c UE4Editor.exe!GuardedMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
 [Callstack] 0x00007ff7c030125a UE4Editor.exe!GuardedMainWrapper() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
 [Callstack] 0x00007ff7c03152bd UE4Editor.exe!WinMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
 [Callstack] 0x00007ff7c0317fea UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
 [Callstack] 0x00007ff8cd7c7c24 KERNEL32.DLL!UnknownFunction []
 [Callstack] 0x00007ff8cd9cd721 ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Graphics Features
Affects Versions	4.26.2
Target Fix	4.27

Fix Commit	16036220
Main Commit	16114108
Release Commit	16036220

Created	Apr 15, 2021
Resolved	Apr 16, 2021
Updated	Nov 30, 2022

View Jira Issue

UE-113590

Crash when adding a Material Layer with a Static Component Mask Parameter node to a Material Instance

Crash when adding a Material Layer with a Static Component Mask Parameter node to a Material Instance

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