Steps to Reproduce
  1. Download the .SLDASM files from:
    [Link Removed]
  2. Open the UE4 Editor and create a blank Unreal Studio project
  3. Change the Datasmith Importer type to CAD and import the downloaded file

Results
The Editor crashes during import

Callstack
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87cc6ee80 UE4Editor-DatasmithCADImporter.dll!GPPlatingInterface::generateUVSet() [d:\dev\deltacad\enterprise\source\thirdparty\notforlicensees\gpuresdk\releases\release-4.20\source\gpgpure_kernel\gpgpure_data\src\gpplatinginterface.cpp:220]
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87cc70433 UE4Editor-DatasmithCADImporter.dll!GPPlatingInterface::process() [d:\dev\deltacad\enterprise\source\thirdparty\notforlicensees\gpuresdk\releases\release-4.20\source\gpgpure_kernel\gpgpure_data\src\gpplatinginterface.cpp:38]
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87cb447d2 UE4Editor-DatasmithCADImporter.dll!GPGPureData::generateUVSet() [d:\dev\deltacad\enterprise\source\thirdparty\notforlicensees\gpuresdk\releases\release-4.20\source\gpgpure_kernel\gpgpure_data\src\gpgpuredata.cpp:851]
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87ca1921c UE4Editor-DatasmithCADImporter.dll!GPureExtension::UnwrapUV() [d:\dev\deltacad\enterprise\source\thirdparty\notforlicensees\gpuresdk\releases\release-4.20\gpureextension\sources\gpureuvgeneration.cpp:231]
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87c9f5fba UE4Editor-DatasmithCADImporter.dll!FGPureMeshInterface::CreateMesh() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87c9f7c3d UE4Editor-DatasmithCADImporter.dll!FDatasmithCADImporter::CreateStaticMesh() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87c9fd8cb UE4Editor-DatasmithCADImporter.dll!UDatasmithCADImportFactory::ImportStaticMesh() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87eeb23ce UE4Editor-DatasmithImporter.dll!UDatasmithImportFactory::ImportStaticMeshes() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87eeaaf7b UE4Editor-DatasmithImporter.dll!UDatasmithImportFactory::ImportDatasmithScene() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87eea3fe6 UE4Editor-DatasmithImporter.dll!UDatasmithImportFactory::Import() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87c9fa89c UE4Editor-DatasmithCADImporter.dll!UDatasmithCADImportFactory::FactoryCreateFile() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff890f61825 UE4Editor-UnrealEd.dll!UFactory::ImportObject() [d:\build\++ue4\sync\engine\source\editor\unrealed\private\factories\factory.cpp:170]
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87eea891d UE4Editor-DatasmithImporter.dll!DatasmithImporterHelperInternal::ImportAssets() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87eea3413 UE4Editor-DatasmithImporter.dll!DatasmithImporterHelperInternal::Import() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87eeabdc1 UE4Editor-DatasmithImporter.dll!FDatasmithImporterHelper::ImportInternal() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff87c9fa58e UE4Editor-DatasmithCADImporter.dll!?ExecuteIfSafe@?$TBaseRawMethodDelegateInstance@$0A@VFCADImporterModule@@$$A6AXXZ$$V@@UEBA_NXZ() []
[2018.08.01-14.33.15:686][482]LogWindows: Error: [Callstack] 0x00007ff8970c29fe UE4Editor-Slate.dll!FUICommandList::ExecuteAction() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff87ee897a3 UE4Editor-DatasmithImporter.dll!?Execute@?$TBaseStaticDelegateInstance@$$A6A?AV?$TSharedRef@VFExtender@@$0A@@@V?$TSharedRef@VFUICommandList@@$0A@@@V?$TArray@PEAVAActor@@VFDefaultAllocator@@@@@Z$$V@@UEBA?AV?$TSharedRef@VFExtender@@$0A@@@V?$TSharedRef@VFUICommandList@@$0A@@@V?$TArray@PEAVAActor@@VFDefaultAllocator@@@@@Z() []
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8970c29fe UE4Editor-Slate.dll!FUICommandList::ExecuteAction() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\commands\uicommandlist.cpp:97]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8971c5872 UE4Editor-Slate.dll!SToolBarButtonBlock::OnClicked() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\multibox\stoolbarbuttonblock.cpp:300]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8971a24bf UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl(void)>::Execute() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:269]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff897289c3b UE4Editor-Slate.dll!SButton::OnMouseButtonUp() [d:\build\++ue4\sync\engine\source\runtime\slate\private\widgets\input\sbutton.cpp:290]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8970794c5 UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:268]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff897111db2 UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5472]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8970f7c7a UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5979]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8970eb25c UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5959]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8adf7d1c7 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:1736]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8adf70270 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:2182]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8adf7f4c5 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:895]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8adf6c209 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsapplication.cpp:732]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8df80b85d USER32.dll!UnknownFunction []
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8df80b1ef USER32.dll!UnknownFunction []
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8adf80646 UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [d:\build\++ue4\sync\engine\source\runtime\applicationcore\private\windows\windowsplatformapplicationmisc.cpp:129]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff740d954e5 UE4Editor.exe!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3417]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff740da5b3c UE4Editor.exe!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:166]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff740da5bba UE4Editor.exe!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:144]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff740db3dac UE4Editor.exe!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:223]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff740db5aaa UE4Editor.exe!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283]
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8df761fe4 KERNEL32.DLL!UnknownFunction []
[2018.08.01-14.33.15:687][482]LogWindows: Error: [Callstack] 0x00007ff8e05ecb31 ntdll.dll!UnknownFunction []

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Fixed
ComponentEnterprise - Datasmith - CAD
Affects Versions4.19.24.20.1
Target Fix4.21
Fix Commit4345711
CreatedAug 1, 2018
ResolvedSep 7, 2018
UpdatedSep 10, 2018