Description

This is an infrequent crash in 4.18. Users have not provided any descriptions of their actions when the crash occurred.

Source Context

 147       		for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ViewIndex++)
  148       		{
  149       			if (VisibilityMap & (1 << ViewIndex))
  150       			{
  151       				const FSceneView* View = Views[ViewIndex];
  152       				FPrimitiveDrawInterface* PDI = Collector.GetPDI(ViewIndex);
  153       
  154       				for (const FSegmentProxy& Segment : Segments)
  155       				{
  156       					const FLinearColor SegmentColor = Segment.bSelected ? SelectedSplineColor : SplineColor;
  157       
  158 ***** 					FLandscapeSplineInterpPoint OldPoint = Segment.Points[0];
  159       					OldPoint.Center       = MyLocalToWorld.TransformPosition(OldPoint.Center);
  160       					OldPoint.Left         = MyLocalToWorld.TransformPosition(OldPoint.Left);
  161       					OldPoint.Right        = MyLocalToWorld.TransformPosition(OldPoint.Right);
  162       					OldPoint.FalloffLeft  = MyLocalToWorld.TransformPosition(OldPoint.FalloffLeft);
  163       					OldPoint.FalloffRight = MyLocalToWorld.TransformPosition(OldPoint.FalloffRight);
  164       					for (int32 i = 1; i < Segment.Points.Num(); i++)
  165       					{
  166       						FLandscapeSplineInterpPoint NewPoint = Segment.Points[i];
  167       						NewPoint.Center       = MyLocalToWorld.TransformPosition(NewPoint.Center);
  168       						NewPoint.Left         = MyLocalToWorld.TransformPosition(NewPoint.Left);
  169       						NewPoint.Right        = MyLocalToWorld.TransformPosition(NewPoint.Right);
  170       						NewPoint.FalloffLeft  = MyLocalToWorld.TransformPosition(NewPoint.FalloffLeft);
  171       						NewPoint.FalloffRight = MyLocalToWorld.TransformPosition(NewPoint.FalloffRight);
Steps to Reproduce

repro steps currently unknown

Callstack
Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Build\++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 610] 
Array index out of bounds: 0 from an array of size 0

UE4Editor_Landscape!FLandscapeSplinesSceneProxy::GetDynamicMeshElements() [landscapesplines.cpp:159]
UE4Editor_Renderer!FSceneRenderer::GatherDynamicMeshElements() [scenevisibility.cpp:1973]
UE4Editor_Renderer!FSceneRenderer::ComputeViewVisibility() [scenevisibility.cpp:2634]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::InitViews() [scenevisibility.cpp:2875]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [deferredshadingrenderer.cpp:579]
UE4Editor_Renderer!RenderViewFamily_RenderThread() [scenerendering.cpp:2081]
UE4Editor_Renderer!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`26'::EURCMacro_FDrawSceneCommand>::ExecuteTask() [taskgraphinterfaces.h:784]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [taskgraph.cpp:651]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [taskgraph.cpp:560]
UE4Editor_RenderCore!RenderingThreadMain() [renderingthread.cpp:327]
UE4Editor_RenderCore!FRenderingThread::Run() [renderingthread.cpp:461]
UE4Editor_Core!FRunnableThreadWin::Run() [windowsrunnablethread.cpp:76]

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Fixed
ComponentTools - Landscape
Affects Versions4.184.18.1
Target Fix4.18.2
Fix Commit3768718
CreatedNov 17, 2017
ResolvedJan 10, 2018
UpdatedJun 23, 2018