I tried changing my mirror mode settings for the VR preview (attempting to get a fullscreen image on the mirrored window) via console commands from a BP node.
After starting a VR preview with the ‘HMD mirror mode 4’ command (which I see some have reported as not working for the ), I got a black screen on the mirrored window. When I closed the VR preview, a frozen image of my scene was still displaying on the HMD, though I had closed the preview, so that I couldn’t see the typical home area.
I changed the Engine.ini WindowMirrorMode setting to 2 as suggested in the forums, and this fixed the black mirror window (though in stereo distorted format instead of the default), but when I exit VR previews, the last frame of the scene I was playing is still visible on the HMD.
EDIT: It seems like the frozen frame issue also happens with clean projects. I may have just not noticed it before. Also, my mirror window is appearing normal in these cleans projects (with vertical black bars on either side of a mono image).
That frozen image is normal as long as you have the editor running. This doesnt happen with a packaged game as far as i experienced.
Regarding the mirrow window, yes, this is quite “broken” in UE4 and only works correctly on the Oculus Rift. If you try to modify those settings on the , things like the black mirror window happen. Also, while for the oculus the mirror mode 2 should be the “normal” mono one, for the mode 2 is stereo view. Try setting it to mode 1 manually in the config file.
I noticed that you said that you could reproduce this issue in a clean project. To insure that we are seeing the same issue, could you provide a detailed list of steps to reproduce this issue on our end?
After doing a bit more digging I was able to find that these are known issues. I have provided links to the public tracker. Please feel free to visit these threads for future updates.