Unreal Engine Issues and Bug Tracker (UE-47468)

Description

This is a common crash affecting users in 4.16, and has occurred since at least 4.14. Over 200 unique users have been affected, though they have provided little information.

User Descriptions

I am a complete rookie with the Unreal Engine. When the engine crashed, I selected a material info object to apply to a layer to use to paint a landscape. It is likely that I selected the wrong one, as both had the same name.

Source Context

1982       	// See if the deleted layer is a NoWeightBlend layer - if not, we don't have to worry about normalization
 1983       	const bool bFromLayerIsNoWeightBlend = (FromLayerInfo && FromLayerInfo->bNoWeightBlend);
 1984       	const bool bToLayerIsNoWeightBlend = (ToLayerInfo && ToLayerInfo->bNoWeightBlend);
 1985       
 1986       	const bool bRequireNormalization = (bFromLayerIsNoWeightBlend != bToLayerIsNoWeightBlend);
 1987       	checkf(!bRequireNormalization, TEXT("It is not yet supported to replace a layer with another whose bNoWeightBlend setting does not match"))
 1988       
 1989 ***** 	if (bMerging)
 1990       	{
 1991       		FWeightmapLayerAllocationInfo& ToLayerAllocation = WeightmapLayerAllocations[ToLayerIdx];
 1992       
 1993       		// Lock data for all the weightmaps
 1994       		FLandscapeTextureDataInfo* FromTexDataInfo = LandscapeEdit.GetTextureDataInfo(WeightmapTextures[FromLayerAllocation.WeightmapTextureIndex]);
 1995       		FLandscapeTextureDataInfo* ToTexDataInfo = LandscapeEdit.GetTextureDataInfo(WeightmapTextures[ToLayerAllocation.WeightmapTextureIndex]);
 1996       
 1997       		check(FromTexDataInfo->GetMipSizeX(0) == FromTexDataInfo->GetMipSizeY(0));
 1998       		check(ToTexDataInfo->GetMipSizeX(0) == ToTexDataInfo->GetMipSizeY(0));
 1999       		check(FromTexDataInfo->GetMipSizeX(0) == ToTexDataInfo->GetMipSizeX(0));
 2000       		const int32 MipSize = FromTexDataInfo->GetMipSizeX(0);
 2001       
 2002       		uint8* const SrcTextureData = (uint8*)FromTexDataInfo->GetMipData(0) + ChannelOffsets[FromLayerAllocation.WeightmapTextureChannel];
 2003       		uint8* const DestTextureData = (uint8*)ToTexDataInfo->GetMipData(0) + ChannelOffsets[ToLayerAllocation.WeightmapTextureChannel];

Steps to Reproduce

repro steps currently unknown (but probably replacing a layer with another whose bNoWeightBlend setting does not match)

Callstack

Assertion failed: !bRequireNormalization [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeEditInterface.cpp] 
[Line: 1988] It is not yet supported to replace a layer with another whose bNoWeightBlend setting does not match

UE4Editor_Landscape!ULandscapeComponent::ReplaceLayer() [landscapeeditinterface.cpp:1990]
UE4Editor_Landscape!FLandscapeEditDataInterface::ReplaceLayer() [landscapeeditinterface.cpp:2112]
UE4Editor_Landscape!ULandscapeInfo::ReplaceLayer() [landscapeedit.cpp:3154]
UE4Editor_LandscapeEditor!FLandscapeEditorCustomNodeBuilder_TargetLayers::OnTargetLayerSetObject() [landscapeeditordetailcustomization_targetlayers.cpp:1116]
UE4Editor_LandscapeEditor!TBaseStaticDelegateInstance<void __cdecl() [delegateinstancesimpl.h:1027]
UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,SObjectPropertyEntryBox,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,SObjectPropertyEntryBox,0,void __cdecl() [delegateinstancesimpl.h:434]
UE4Editor_PropertyEditor!SPropertyEditorAsset::SetValue() [spropertyeditorasset.cpp:610]
UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,SPropertyEditorAsset,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,SPropertyEditorAsset,0,void __cdecl() [delegateinstancesimpl.h:434]
UE4Editor_PropertyEditor!SPropertyMenuAssetPicker::OnAssetSelected() [spropertymenuassetpicker.cpp:249]
UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,SPropertyMenuAssetPicker,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,SPropertyMenuAssetPicker,0,void __cdecl() [delegateinstancesimpl.h:434]
UE4Editor_ContentBrowser!SAssetView::AssetSelectionChanged() [sassetview.cpp:3620]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,0,void __cdecl() [delegateinstancesimpl.h:434]
UE4Editor_ContentBrowser!TBaseDelegate<void,TSharedPtr<FAssetViewItem,0>,enum ESelectInfo::Type>::ExecuteIfBound() [delegatesignatureimpl.inl:624]
UE4Editor_ContentBrowser!SListView<TSharedPtr<FAssetViewItem,0> >::Private_SignalSelectionChanged() [slistview.h:735]
UE4Editor_ContentBrowser!STableRow<TSharedPtr<FAssetViewItem,0> >::OnMouseButtonUp() [stablerow.h:476]
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() [slateapplication.cpp:5049]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() [slateapplication.cpp:239]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5038]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5515]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5495]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1704]
UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2127]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:867]
UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:714]
user32!UserCallWinProcCheckWow()
user32!DispatchMessageWorker()
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3058]
UE4Editor!GuardedMain() [launch.cpp:166]
UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134]
UE4Editor!WinMain() [launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [exe_common.inl:253]
kernel32!BaseThreadInitThunk()
ntdll!RtlUserThreadStart()

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Fixed

Component	UE - LD & Modeling - Terrain - Landscape
Affects Versions	4.14, 4.15, 4.16, 4.17
Target Fix	4.18

Fix Commit	3666471
Release Commit	3666471

Created	Jul 19, 2017
Resolved	Sep 27, 2017
Updated	Oct 30, 2017

View Jira Issue

UE-47468

[CrashReport] Assertion failed: !bRequireNormalization - UE4Editor_Landscape!ULandscapeComponent::ReplaceLayer()

[CrashReport] Assertion failed: !bRequireNormalization - UE4Editor_Landscape!ULandscapeComponent::ReplaceLayer()

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