I set up a shortcut using UE4Editor xxxx.uproject -DX12 to open the editor in DX12. And everything seem fine unitl I try Play in VR. It always crashes with the following info. Is it calling DX11 functions while it should be calling DX12 functions?
Access violation - code c0000005 (first/second chance not available)
UE4Editor_SteamVR!FSteamVRHMD::D3D11Bridge::UpdateViewport()
UE4Editor_SteamVR!FSteamVRHMD::UpdateViewport()
UE4Editor_Engine!FSceneViewport::EnqueueBeginRenderFrame() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\slate\sceneviewport.cpp:1353]
UE4Editor_Engine!FViewport::Draw() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\unrealclient.cpp:1124]
UE4Editor_Engine!FSceneViewport::ResizeViewport() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\slate\sceneviewport.cpp:1172]
UE4Editor_Engine!FSceneViewport::ResizeFrame() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\slate\sceneviewport.cpp:1103]
UE4Editor_Engine!UGameEngine::SwitchGameWindowToUseGameViewport() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\engine\private\gameengine.cpp:411]
UE4Editor_MoviePlayer!FDefaultGameMoviePlayer::WaitForMovieToFinish() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\movieplayer\private\defaultgamemovieplayer.cpp:395]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2777]
UE4Editor!GuardedMain() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\launch.cpp:148]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build\++ue4+release-4.12+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll