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Montzterrr's avatar
Montzterrr
Honored Guest
7 years ago

Developing a VR game in Unreal Engine 4. Encountering a strange visual glitch.

I am designing a VR project in Unreal Engine 4. When I run the game in editor my Oculus displays strange tearing and optical glitching that does not appear in the editor view. I'm not sure what is causing this. I believe my frame rate is high enough and my hardware is an Alienware 17 r4 which meets VR spec.

Bellow is a link to an OBS capture of the issue. The top left screen is from the editor preview, while the lower right screen is from the oculus monitor program. 

https://www.youtube.com/watch?v=RzeV4BczJGM

I am unsure what is causing the issue or how to go about fixing it, as I am just learning how to program in UE4 and design a VR experience.

Any insight would be appreciated.

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  • kojack's avatar
    kojack
    MVP
    7 years ago
    That looks like the effect of ASW doing its reprojection. Games like Elite get the same effect in menu guis if you have ASW on.
    The reason you see it in Mirror but not the editor is because Unreal is showing what it rendered, the ASW happens after Unreal sends it to the oculus sdk and is only visible in the Mirror or on the headset.

    There's no way to disable it in code that I know of, it will happen any time you aren't hitting 90fps. The end user can turn it off using Control-Numpad1 or the Oculus Debug Tool or Oculus Tray Tool.