[4.8p3] Crash on lighting build

Development Rendering
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1

Hey there, I currently have an issue with the 4.8 preview 3 engine build. Whenever I try to build lighting for my project it will export lighting data up till 34% then immediately crash. There have been no other hiccups with this build though. Any advice will be greatly appreciated, cheers :slight_smile:

Crash report data:

Unknown exception - code 00000001 (first/second chance not available)

"Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 678]
Array index out of

KERNELBASE
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FOutputDevice::Logf__VA() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\misc\outputdevice.cpp:360]
UE4Editor_UnrealEd!GetLandscapeOpacityData() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\lightmass\lightmasslandscaperender.cpp:269]
UE4Editor_UnrealEd!FLightmassMaterialRenderer::GenerateMaterialPropertyData() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\lightmass\lightmassrender.cpp:984]
UE4Editor_UnrealEd!FLightmassMaterialRenderer::GenerateMaterialData() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\lightmass\lightmassrender.cpp:894]
UE4Editor_UnrealEd!FLightmassExporter::ExportMaterial() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\lightmass\lightmass.cpp:1206]
UE4Editor_UnrealEd!FLightmassExporter::WriteToMaterialChannel() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\lightmass\lightmass.cpp:680]
UE4Editor_UnrealEd!FLightmassProcessor::ExecuteAmortizedMaterialExport() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\lightmass\lightmass.cpp:2423]
UE4Editor_UnrealEd!FStaticLightingSystem::UpdateLightingBuild() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\staticlightingsystem\staticlightingsystem.cpp:1996]
UE4Editor_UnrealEd!UEditorEngine::UpdateBuildLighting() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\staticlightingsystem\staticlightingsystem.cpp:2153]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\unrealedengine.cpp:407]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\launchengineloop.cpp:2355]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]

2

I’m facing a similar problem. Have you found any solution yet?

3

Not yet, however it seems to only occur with large worlds. Even in a blank projects.

4

Hi Marced for Life -

Thank you for the report. This appears to be a known crash whose fix did not make it into the Preview 3 release. We’ve tested the fix internally and it should be integrated into the next 4.8 release.

Eric Ketchum

5

Oh awesome, thanks for the info! :slight_smile: