Work From Home: How to use Unreal through Remote Desktop

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The orbiting editor viewport mouse input bug is still present when using UE4Editor (4.24) remotely on Linux via a VNC client (e.g. on Ubuntu 18.04 with vino as the default VNC server on the server side).

The following patch can be used to add a new command-line option (-norelativemousemode) to the Linux build of UE4Editor so it can be used remotely with a VNC client:



diff --git Engine/Source/Runtime/ApplicationCore/Private/Linux/LinuxApplication.cpp Engine/Source/Runtime/ApplicationCore/Private/Linux/LinuxApplication.cpp
index 2eec72a6d18..ed18ad067ea 100644
--- Engine/Source/Runtime/ApplicationCore/Private/Linux/LinuxApplication.cpp
+++ Engine/Source/Runtime/ApplicationCore/Private/Linux/LinuxApplication.cpp
@@ -1362,7 +1362,10 @@ void FLinuxApplication::SetHighPrecisionMouseMode( const bool Enable, const TSha
 {
        MessageHandler->OnCursorSet();
        bUsingHighPrecisionMouseInput = Enable;
-       SDL_SetRelativeMouseMode(Enable ? SDL_TRUE : SDL_FALSE);
+       if (!FParse::Param(FCommandLine::Get(), TEXT("norelativemousemode")))
+       {
+               SDL_SetRelativeMouseMode(Enable ? SDL_TRUE : SDL_FALSE);
+       }
 }

 void FLinuxApplication::RefreshDisplayCache()

Note that some VNC clients also have a problem with key press/release propagation in the editor viewport (most notably Remmina) limiting the ability to move in the viewport via keyboard. TigerVNC seems to be the one that propagates key press/release properly.

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