Unreal Engine Issues and Bug Tracker (UE-99308)

Description

The editor crashes when attempting to draw a weight blended texture to the landscape if it hasnt been used on that landscape yet. This crash can be completely avoided if the stone texture is painted somewhere on the landscape already.

This does not occur in //UE4/Release-4.24 cl 11590231 so I am marking this as a regression.

Steps to Reproduce

Open attached project
Select the "SplineActor" actor within the scene
Click "Editor Apply Spline" in the details panel

Result
The editor crashes

Expected
The spline is applied to the landscape and paints the stone texture beneath it.

Callstack

Assertion failed: !TargetProxy->HasLayersContent() || !InCanUseEditingWeightmap || EditingLayerGUID.IsValid() [File:D:/P4Workspaces/UE4Main/Engine/Source/Runtime/Landscape/Private/LandscapeEdit.cpp] [Line: 5373] 



KERNELBASE.dll!UnknownFunction []
UE4Editor-Core.dll!ReportAssert() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformCrashContext.cpp:1610]
UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Core\Private\Windows\WindowsErrorOutputDevice.cpp:78]
UE4Editor-Core.dll!FOutputDevice::LogfImpl() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Core\Private\Misc\OutputDevice.cpp:61]
UE4Editor-Core.dll!AssertFailedImplV() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:102]
UE4Editor-Core.dll!FDebug::CheckVerifyFailedImpl() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:458]
UE4Editor-Landscape.dll!ULandscapeComponent::ReallocateWeightmaps() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Landscape\Private\LandscapeEdit.cpp:5373]
UE4Editor-Landscape.dll!FLandscapeEditDataInterface::SetAlphaData() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Landscape\Private\LandscapeEditInterface.cpp:2881]
UE4Editor-Landscape.dll!RasterizeSegmentAlpha() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Landscape\Private\LandscapeSplineRaster.cpp:548]
UE4Editor-Landscape.dll!LandscapeSplineRaster::RasterizeSegmentPoints() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Landscape\Private\LandscapeSplineRaster.cpp:867]
UE4Editor-Landscape.dll!ALandscapeProxy::EditorApplySpline() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Landscape\Private\LandscapeBlueprintSupport.cpp:27]
UE4Editor-Landscape.dll!ALandscapeProxy::execEditorApplySpline() [D:\P4Workspaces\UE4Main\Engine\Intermediate\Build\Win64\UE4Editor\Inc\Landscape\LandscapeProxy.gen.cpp:814]
UE4Editor-CoreUObject.dll!UFunction::Invoke() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:5565]
UE4Editor-CoreUObject.dll!UObject::CallFunction() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:990]
UE4Editor-CoreUObject.dll!UObject::ProcessContextOpcode() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:2863]
UE4Editor-CoreUObject.dll!ProcessLocalScriptFunction() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1060]
UE4Editor-CoreUObject.dll!ProcessScriptFunction<void (__cdecl*)(UObject *,FFrame &,void *)>() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:891]
UE4Editor-CoreUObject.dll!ProcessLocalFunction() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1121]
UE4Editor-CoreUObject.dll!ProcessLocalScriptFunction() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1060]
UE4Editor-CoreUObject.dll!UObject::ProcessInternal() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1148]
UE4Editor-CoreUObject.dll!UFunction::Invoke() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:5565]
UE4Editor-CoreUObject.dll!UObject::ProcessEvent() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\CoreUObject\Private\UObject\ScriptCore.cpp:1985]
UE4Editor-Engine.dll!AActor::ProcessEvent() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Engine\Private\Actor.cpp:863]
UE4Editor-DetailCustomizations.dll!FObjectDetails::OnExecuteCallInEditorFunction() [D:\P4Workspaces\UE4Main\Engine\Source\Editor\DetailCustomizations\Private\ObjectDetails.cpp:235]
UE4Editor-DetailCustomizations.dll!TBaseSPMethodDelegateInstance<0,FObjectDetails,0,FReply __cdecl(void),FDefaultDelegateUserPolicy,TWeakObjectPtr<UFunction,FWeakObjectPtr> >::Execute() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
UE4Editor-Slate.dll!SButton::ExecuteOnClick() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385]
UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304]
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:376]
UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4803]
UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5344]
UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5309]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2155]
UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2607]
UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1023]
UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:855]
USER32.dll!UnknownFunction []
USER32.dll!UnknownFunction []
UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
UE4Editor.exe!FEngineLoop::Tick() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4746]
UE4Editor.exe!GuardedMain() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
UE4Editor.exe!GuardedMainWrapper() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor.exe!WinMain() [D:\P4Workspaces\UE4Main\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
UE4Editor.exe!__scrt_common_main_seh() [D:\agent\_work\9\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
KERNEL32.DLL!UnknownFunction []
ntdll.dll!UnknownFunction []

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Fixed

Component	UE - LD & Modeling - Terrain - Landscape
Affects Versions	4.25, 4.26
Target Fix	4.26

Fix Commit	14310169
Release Commit	14310169

Created	Sep 9, 2020
Resolved	Sep 14, 2020
Updated	Apr 28, 2021

UE-99308

Crash when attempting to deform a landscape when Paint Layer has not been used - Assertion failed: !TargetProxy->HasLayersContent() || !InCanUseEditingWeightmap || EditingLayerGUID.IsValid() [LandscapeEdit.cpp Line: 5252]

Crash when attempting to deform a landscape when Paint Layer has not been used - Assertion failed: !TargetProxy->HasLayersContent() || !InCanUseEditingWeightmap || EditingLayerGUID.IsValid() [LandscapeEdit.cpp Line: 5252]

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