Description

Generating a proxy mesh with imported models and the simplify mesh flag set to true causes the editor to crash.

Tested in 4.21.2 (CL - 4753647), 4.22.3 (CL - 7053647), 4.23 (CL - 7288428), 4.24 (CL - 7285696)

Steps to Reproduce
  1. Download the attached project
  2. Open the Hierarchial LOD Outliner
  3. Generate Clusters
  4. Under Hierarchial LODSetup, select Simplify Mesh
  5. Generate Proxy Meshes or Rebuild All

 

Expected: The a simplified proxy mesh would be generated

Result: The editor crashes

Callstack

LoginId:5964f8f84766f4b976277180442869c1
EpicAccountId:d237bdd466454ba6a10848877d154538

Assertion failed: Remap.IsValidIndex(PolygonGroupID.GetValue()) [Link Removed] [Line: 1465] Missing material bake output index entry for mesh(section)

UE4Editor_Core!FWindowsErrorOutputDevice::Serialize() [e:\daniel.hamilton_ue4main\engine\source\runtime\core\private\windows\windowserroroutputdevice.cpp:79]
UE4Editor_Core!FOutputDevice::LogfImpl() [e:\daniel.hamilton_ue4main\engine\source\runtime\core\private\misc\outputdevice.cpp:71]
UE4Editor_Core!AssertFailedImplV() [e:\daniel.hamilton_ue4main\engine\source\runtime\core\private\misc\assertionmacros.cpp:101]
UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [e:\daniel.hamilton_ue4main\engine\source\runtime\core\private\misc\assertionmacros.cpp:445]
UE4Editor_MeshMergeUtilities!<lambda_11f116a974b3ed6470c2828b3ddce8bc>::operator()() [e:\daniel.hamilton_ue4main\engine\source\developer\meshmergeutilities\private\meshmergeutilities.cpp:1465]
UE4Editor_ProxyLODMeshReduction!<lambda_de641a5da653da9c71c6c3a24fcacab6>::operator()() [e:\daniel.hamilton_ue4main\engine\plugins\experimental\proxylodplugin\source\proxylod\private\proxylodplugin.cpp:875]
UE4Editor_ProxyLODMeshReduction!tbb::internal::task_group_base::internal_run_and_wait<<lambda_de641a5da653da9c71c6c3a24fcacab6> const >() [e:\daniel.hamilton_ue4main\engine\source\thirdparty\inteltbb\inteltbb-4.4u3\include\tbb\task_group.h:91]
UE4Editor_ProxyLODMeshReduction!FVoxelizeMeshMerging::ProxyLOD() [e:\daniel.hamilton_ue4main\engine\plugins\experimental\proxylodplugin\source\proxylod\private\proxylodplugin.cpp:869]
UE4Editor_MeshMergeUtilities!FMeshMergeUtilities::CreateProxyMesh() [e:\daniel.hamilton_ue4main\engine\source\developer\meshmergeutilities\private\meshmergeutilities.cpp:1574]
UE4Editor_HierarchicalLODUtilities!FHierarchicalLODUtilities::BuildStaticMeshForLODActor() [e:\daniel.hamilton_ue4main\engine\source\developer\hierarchicallodutilities\private\hierarchicallodutilities.cpp:418]
UE4Editor_HierarchicalLODUtilities!FHierarchicalLODUtilities::BuildStaticMeshForLODActor() [e:\daniel.hamilton_ue4main\engine\source\developer\hierarchicallodutilities\private\hierarchicallodutilities.cpp:233]
UE4Editor_UnrealEd!FHierarchicalLODBuilder::BuildMeshesForLODActors() [e:\daniel.hamilton_ue4main\engine\source\editor\unrealed\private\hierarchicallod.cpp:726]
UE4Editor_HierarchicalLODOutliner!<lambda_54dc5f3e535b305158d197f37ea80386>::operator()() [e:\daniel.hamilton_ue4main\engine\source\editor\hierarchicallodoutliner\private\hlodoutliner.cpp:798]
UE4Editor_HierarchicalLODOutliner!HLODOutliner::SHLODOutliner::HandleBuildLODActors() [e:\daniel.hamilton_ue4main\engine\source\editor\hierarchicallodoutliner\private\hlodoutliner.cpp:819]
UE4Editor_HierarchicalLODOutliner!TBaseSPMethodDelegateInstance<0,HLODOutliner::SHLODOutliner,0,FReply __cdecl(void)>::Execute() [e:\daniel.hamilton_ue4main\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:293]
UE4Editor_Slate!SButton::ExecuteOnClick() [e:\daniel.hamilton_ue4main\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:379]
UE4Editor_Slate!SButton::OnMouseButtonUp() [e:\daniel.hamilton_ue4main\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:303]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_6c1f6b862bcfb82ea6dcab28fbcc9463> >() [e:\daniel.hamilton_ue4main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:273]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [e:\daniel.hamilton_ue4main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5631]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [e:\daniel.hamilton_ue4main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6236]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [e:\daniel.hamilton_ue4main\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:6209]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [e:\daniel.hamilton_ue4main\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1880]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [e:\daniel.hamilton_ue4main\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2332]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [e:\daniel.hamilton_ue4main\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1560]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [e:\daniel.hamilton_ue4main\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:790]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [e:\daniel.hamilton_ue4main\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:123]
UE4Editor!FEngineLoop::Tick() [e:\daniel.hamilton_ue4main\engine\source\runtime\launch\private\launchengineloop.cpp:4168]
UE4Editor!GuardedMain() [e:\daniel.hamilton_ue4main\engine\source\runtime\launch\private\launch.cpp:173]
UE4Editor!GuardedMainWrapper() [e:\daniel.hamilton_ue4main\engine\source\runtime\launch\private\windows\launchwindows.cpp:147]
UE4Editor!WinMain() [e:\daniel.hamilton_ue4main\engine\source\runtime\launch\private\windows\launchwindows.cpp:279]
UE4Editor!__scrt_common_main_seh() [d:\agent\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Unresolved
ComponentRendering
Affects Versions4.234.244.22.3
Target Fix4.23
CreatedJul 12, 2019
UpdatedJul 17, 2019