Description

Crash when removing edges in Geometry mode. Seems to happen when trying to remove all edges from a side.

Steps to Reproduce
  1. Place a cube in the editor
  2. Switch to Geometry > Edge editing mode
  3. Proceed to remove all edges of a face (with the remove button, not the delete key)
  4. Observe crash

[Image Removed]

Callstack
LoginId:c917628f4446bb8a745f14a23d7b3172
EpicAccountId:c687981c4d1f4b3499c0bb1908069a2a

Assertion failed: !ContourVertexInstance.ConnectedPolygons.Contains( PolygonID ) [File:D:\P4\ Dev-Geometry\Engine\Source\Runtime\MeshEditingRuntime\EditableMesh.cpp] [Line: 4500] 



UE4Editor_Core!FDebug::AssertFailed() [d:\p4\ dev-geometry\engine\source\runtime\core\private\misc\assertionmacros.cpp:349]
UE4Editor_MeshEditingRuntime!UEditableMesh::CreatePolygonContour() [d:\p4\ dev-geometry\engine\source\runtime\mesheditingruntime\editablemesh.cpp:4501]
UE4Editor_MeshEditingRuntime!UEditableMesh::CreatePolygons() [d:\p4\ dev-geometry\engine\source\runtime\mesheditingruntime\editablemesh.cpp:4539]
UE4Editor_MeshEditingRuntime!UEditableMesh::TryToRemovePolygonEdge() [d:\p4\ dev-geometry\engine\source\runtime\mesheditingruntime\editablemesh.cpp:5605]
UE4Editor_PolygonModeling!URemoveEdgeCommand::Execute() [d:\p4\ dev-geometry\engine\plugins\editor\mesheditor\source\polygonmodeling\removeedge.cpp:70]
UE4Editor_MeshEditor!TBaseFunctorDelegateInstance<void __cdecl(void),<lambda_e76b65ec5a542af7478e98f51431ba69> >::ExecuteIfSafe() [d:\p4\ dev-geometry\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:1199]
UE4Editor_MeshEditor!<lambda_92f58c9817a9987e55cf82081a2c7dd6>::operator()() [d:\p4\ dev-geometry\engine\plugins\editor\mesheditor\source\mesheditor\mesheditormodetoolkit.cpp:45]
UE4Editor_MeshEditor!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<<lambda_92f58c9817a9987e55cf82081a2c7dd6> const & __ptr64>() [d:\p4\ dev-geometry\engine\source\runtime\core\public\templates\tuple.h:497]
UE4Editor_MeshEditor!TBaseFunctorDelegateInstance<FReply __cdecl(void),<lambda_92f58c9817a9987e55cf82081a2c7dd6> >::Execute() [d:\p4\ dev-geometry\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:1132]
UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [d:\p4\ dev-geometry\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:537]
UE4Editor_Slate!SButton::OnMouseButtonUp() [d:\p4\ dev-geometry\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:283]
UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator()() [d:\p4\ dev-geometry\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5197]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [d:\p4\ dev-geometry\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:239]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [d:\p4\ dev-geometry\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5186]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\p4\ dev-geometry\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5688]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\p4\ dev-geometry\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5668]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\p4\ dev-geometry\engine\source\runtime\core\private\windows\windowsapplication.cpp:1699]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\p4\ dev-geometry\engine\source\runtime\core\private\windows\windowsapplication.cpp:2122]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\p4\ dev-geometry\engine\source\runtime\core\private\windows\windowsapplication.cpp:862]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\p4\ dev-geometry\engine\source\runtime\core\private\windows\windowsapplication.cpp:709]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\p4\ dev-geometry\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:1009]
UE4Editor!FEngineLoop::Tick() [d:\p4\ dev-geometry\engine\source\runtime\launch\private\launchengineloop.cpp:3115]
UE4Editor!GuardedMain() [d:\p4\ dev-geometry\engine\source\runtime\launch\private\launch.cpp:166]
UE4Editor!GuardedMainWrapper() [d:\p4\ dev-geometry\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\p4\ dev-geometry\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32
ntdll

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Won't Fix
ComponentTools - MeshEditing
Affects Versions4.17
CreatedJun 20, 2017
ResolvedOct 28, 2019
UpdatedOct 28, 2019