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Scene still displayed in Vive after closing VR Preview

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 Vive), 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 Vive 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).

Product Version: UE 4.12
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asked Aug 12 '16 at 04:49 AM in Bug Reports

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2 answers: sort voted first

Hello BioeJD

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.

Black screen

Link: https://issues.unrealengine.com/issue/UE-32419

Image freeze

Link: https://issues.unrealengine.com/issue/UE-29224

Make it a great day

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answered Aug 12 '16 at 05:34 PM

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Rudy Q ♦♦ STAFF
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avatar image BioeJD Aug 12 '16 at 05:54 PM

Wonderful, great digging! Have a great weekend!

(Yes, I probably shouldn't use comments like this, but c'mon I gotta give the staff some love. They're awesome.)

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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 Vive, things like the black mirror window happen. Also, while for the oculus the mirror mode 2 should be the "normal" mono one, for the vive mode 2 is stereo view. Try setting it to mode 1 manually in the config file.

Cheers, Indy

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answered Aug 12 '16 at 07:57 AM

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avatar image Rudy Q ♦♦ STAFF Aug 12 '16 at 02:16 PM

Hello BioeJD,

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?

avatar image BioeJD Aug 12 '16 at 02:35 PM

I guess I described 2 issues here.

Black window screen issue:

  1. Open project with SteamVR plugin enabled

  2. Add console command node to level blueprint (or other) w/ "HMD mirror mode 4"

  3. Compile and save BP

  4. Run VR Preview (and see the mirrored window)

Frozen image in HMD issue:

  1. Open project with SteamVR plugin enabled

  2. Run VR Preview w/ HTC Vive

  3. Close/exit VR Preview (but not UE4 Editor)

  4. Look inside Vive after exiting the Preview (make sure to be sitting down, you may get disoriented)

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