Description

This is an infrequent but longstanding crash that has occurred since at least UE 4.12.

User Descriptions

  • Trying to paint a landscape texture on a seemingly bugged out sector, which was stuck with the old texture.
  • I was just painting my landscape when it suddenly closed

Source Context

4202       	// See if our existing textures have sufficient space
 4203       	int32 ExistingTexAvailableChannels = 0;
 4204       	for (int32 TexIdx = 0; TexIdx < WeightmapTextures.Num(); TexIdx++)
 4205       	{
 4206       		FLandscapeWeightmapUsage* Usage = Proxy->WeightmapUsageMap.Find(WeightmapTextures[TexIdx]);
 4207 ***** 		check(Usage);
 4208       
 4209       		ExistingTexAvailableChannels += Usage->FreeChannelCount();
 4210       
 4211       		if (ExistingTexAvailableChannels >= NeededNewChannels)
 4212       		{
 4213       			break;
 4214       		}
 4215       	}
Steps to Reproduce

repro steps currently unknown

Callstack
Assertion failed: Usage [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeEdit.cpp] [Line: 4208]

UE4Editor_Landscape!ULandscapeComponent::ReallocateWeightmaps() [landscapeedit.cpp:4208]
UE4Editor_Landscape!FLandscapeEditDataInterface::SetAlphaData() [landscapeeditinterface.cpp:2621]
UE4Editor_LandscapeEditor!FAlphamapAccessor<1,0>::SetData() [landscapeedmodetools.h:968]
UE4Editor_LandscapeEditor!FLandscapeToolStrokePaint::Apply() [landscapeedmodepainttools.cpp:253]
UE4Editor_LandscapeEditor!FLandscapeToolBase<FLandscapeToolStrokePaint>::Tick() [landscapeedmodetools.h:1353]
UE4Editor_LandscapeEditor!FEdModeLandscape::Tick() [landscapeedmode.cpp:737]
UE4Editor_UnrealEd!FEditorModeTools::Tick() [editormodemanager.cpp:716]
UE4Editor_UnrealEd!FLevelEditorViewportClient::Tick() [leveleditorviewport.cpp:2072]
UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1734]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:396]
UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3296]
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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Cannot Reproduce
ComponentTools - Landscape
Affects Versions4.124.144.154.164.174.184.19
CreatedNov 16, 2017
ResolvedMay 30, 2019
UpdatedJun 10, 2019