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After VR Preview, Vive drops frame until Unreal is closed

Reproducible on 4.12 and 4.13 preview 2

When using the HTC Vive and SteamVR, after I close a VR Preview of my game, the Vive begins missing frames consistently and is labelled unresponsive. This is fixed immediately by closing Unreal Engine. I can reproduce the problem on both 4.12 and 4.13 preview 2 and it happens every time I use the VR preview.

I am also being affected by open issue UE-29224 (https://issues.unrealengine.com/issue/UE-29224), where the last frame of the VR preview remains after it is closed, but not as consistently so am, unsure if they are related.

Has anyone seen this and know a fix? Else this should be added to the issues list. Thanks very much for your help :)

Product Version: UE 4.12
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asked Aug 17 '16 at 11:18 PM in VR

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avatar image sranck Aug 18 '16 at 12:27 AM

I've had similar performance problems with Vive, too, but I'm not sure it's the same thing. Here are 2 of them:

1) After editing, playing, editing, playing, etc. for a while, I'm no longer able to reach 90 FPS. If I exit the editor and launch it again, I'm back up to 90.

2) The biggest problem is where all of a sudden my frame rate will take a major dive. The game will stutter severely while the Vive display flickers horribly. Sometimes, if I just wait, it'll suddenly fix itself. Other times, I'll have to exit the editor and relaunch.

Do these sound in any way similar to what you're seeing?

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I have exactly the same problem on UE 4.12.5. Any update / info from Epic?

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answered Sep 30 '16 at 11:12 AM

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avatar image sranck Sep 30 '16 at 07:19 PM

I haven't heard from Epic on this. The problem still happens, though I haven't tried 4.13 yet.

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