Unreal Engine Issues and Bug Tracker (UE-57276)

Description

Changing the Max LODLevel on a landscape causes a crash in content examples.

Steps to Reproduce

1. Load Content Examples, open Landscapes level
2. Select a landscape
3. Set LOD / Max LODLevel to 0
4. Save level (crash may start here)
5. Exit UE4 editor
6. Start UE4 editor, load Content Examples, open Landscapes level again

Result: Editor crashes when trying to load the landscapes level after changing Max LODLevel

Callstack

LoginId:2425c04a4245ea67c3691fbe9144aff0
EpicAccountId:6b50d04f360f4c7587a1171ba17d6a2a

Assertion failed: LODScreenRatioSquared.IsValidIndex(InSelectedLODIndex) [File:D:\Build\++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Landscape\Private\LandscapeRender.cpp] [Line: 1698]

UE4Editor_Core!FDebug::AssertFailed() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:419]
UE4Editor_Landscape!FLandscapeComponentSceneProxy::CalculateLODFromScreenSize() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\landscape\private\landscaperender.cpp:1522]
UE4Editor_Landscape!FLandscapeComponentSceneProxy::CalculateBatchElementLOD() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\landscape\private\landscaperender.cpp:1673]
UE4Editor_Landscape!FLandscapeComponentSceneProxy::InitViewCustomData() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\landscape\private\landscaperender.cpp:1777]
UE4Editor_Renderer!FRelevancePacket::MarkRelevant() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\scenevisibility.cpp:1726]
UE4Editor_Renderer!ParallelFor() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\async\parallelfor.h:174]
UE4Editor_Renderer!ComputeAndMarkRelevanceForViewParallel() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\scenevisibility.cpp:1958]
UE4Editor_Renderer!FSceneRenderer::ComputeViewVisibility() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\scenevisibility.cpp:2808]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::InitViews() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\scenevisibility.cpp:3067]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:593]
UE4Editor_Renderer!RenderViewFamily_RenderThread() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\renderer\private\scenerendering.cpp:2749]
UE4Editor_Renderer!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`33'::EURCMacro_FDrawSceneCommand>::ExecuteTask() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\async\taskgraphinterfaces.h:829]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:665]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\async\taskgraph.cpp:574]
UE4Editor_RenderCore!RenderingThreadMain() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:331]
UE4Editor_RenderCore!FRenderingThread::Run() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\rendercore\private\renderingthread.cpp:465]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\build\++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\windows\windowsrunnablethread.cpp:76]

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Fixed

Component	UE - LD & Modeling - Terrain - Landscape
Affects Versions	4.19, 4.20
Target Fix	4.19.2

Fix Commit	4003358

Created	Apr 4, 2018
Resolved	Apr 13, 2018
Updated	Jun 18, 2018

View Jira Issue

UE-57276

Crash during save level and successive load level

Crash during save level and successive load level

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