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motorsep
Inspiring
June 6, 2018

[Go / Gear VR] Are UE 4.20 updates relevant to mobile VR ?

@imperativity

4.20 preview 1 is out and it has some interesting goodies: https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1485599-unreal-engine-4-20-preview

I am wondering if any of those goodies relevant to Go / Gear VR (GLES2 and Vulkan in the nearest future):

Instanced Stereo Rendering: Translucency Support. We’ve taken the improvements to the Instance Stereo Rendering (ISR) path that we made for Robo Recall, and improved them to work across a more robust set of features in the engine. 4.20 adds support for performing the translucency rendering pass using ISR, which can significantly reduce CPU cost on translucency-heavy scenes

Mobile Updates:
  • All of the mobile improvements and optimizations we’ve made for Fortnite on iOS and Android
    • Improved Android Debugging
    • Mobile Landscape Improvements
    • RHO Thread on Android
    • Occlusion Queries on Mobile
    • Software Occlusion Culling
    • Platform Material Stats
    • Improve Mobile Specular Lighting Model


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    43 replies

    TomVR
    TomVR
    Up and Coming
    June 22, 2018
    It seems like unreal engine really doesn't want to get onto the mobile VR track, which means developers who are getting into the GO as a precursor of the santa cruz are going to move to unity.
    motorsepAuthor
    Inspiring
    June 22, 2018

    TomCHall said:

    It seems like unreal engine really doesn't want to get onto the mobile VR track, which means developers who are getting into the GO as a precursor of the santa cruz are going to move to unity.


    What makes you say that?
    owenwp
    Up and Coming
    June 22, 2018
    Instanced stereo rendering is PC only.  On mobile I believe it is called multi-view rendering, which uses a special OpenGL ES extension that Oculus wrote.
    motorsepAuthor
    Inspiring
    July 19, 2018
    @imperativity

    4.20 is officially out. It has hardware occlusions for mobile and that only works with ES3.1 and Vulkan. With all that talent at Oculus, are we really not going to see Vulkan support in Go rather soon, to take full advantage of all these new performance enhancing features and optimizations ?
    MaxArch
    MaxArch
    Inspiring
    July 19, 2018
    Too bad there's no Vulkan support.

    The Instanced Stereo Rendering: Translucency Support is very nice though. In a scene with a lot of trees I go from 40fps to 60fps on the GO which is very nice.
    motorsepAuthor
    Inspiring
    July 20, 2018

    maxBr said:

    Too bad there's no Vulkan support.

    The Instanced Stereo Rendering: Translucency Support is very nice though. In a scene with a lot of trees I go from 40fps to 60fps on the GO which is very nice.


    So it works on mobile after all? As far as I remember 4.20 release notes say it's Rift only.
    MaxArch
    MaxArch
    Inspiring
    July 21, 2018
    @motorsep I just can say; In a project with a lot of trees, I see a 20fps increase when comparing 4.19 to 4.20. Tested the 4.20 build in another 'heavy' project without many trees or transparency and I see no increase in fps so I guessed this was the reason.

    Another feature in 4.20; the splash screen is working now (1280x1440 image). project settings -> OculusVR -> SplashScreen

    Edit -  after doing some more investigation:
    Something is bugged...stopping & starting the same 4.20 project within 20 seconds or so on the GO,
    the second time the screen stays black and you have to reboot the Go???!
    If you briefly press the power button and then start the second session it works fine.
    Alternating two different 4.20 projects is fine,
    running the same 4.19 project many times in a row is fine as well.
    Reported @ UE - hoping this gets fixed soon.

    motorsepAuthor
    Inspiring
    July 23, 2018

    maxBr said:


    Another feature in 4.20; the splash screen is working now (1280x1440 image). project settings -> OculusVR -> SplashScreen
    Although its bugged...starting
    & stopping the same project (with a splash screen) twice in a row,
    the second time the screen stays black and you have to reboot the Go???!
    If you briefly press the power button and then start the second session it works fine. Alternating two different projects with a splash screen is fine, running the same project without a splash screen many times in a row is fine as well. Reported @ UE - hoping this gets fixed soon.




    If you are using Oculus fork of UE4, probably worth reporting it to Oculus too.
    MaxArch
    MaxArch
    Inspiring
    July 26, 2018

    motorsep said:

    ...
    If you are using Oculus fork of UE4, probably worth reporting it to Oculus too.

    Not using any fork. Using the default 4.20 from the UnrealLauncher. I investigated some more and changed my original post above.
    In short; its not the splash screen - its with any project build with 4.20 that's restarted within 20 seconds or so...
    voobrazhenie
    New Participant
    July 28, 2018
    Hey! I found one critical issue in unreal engine 4.20.0 and 4.20.1. Gear VR touch input is disabled. After bug report to ue, they approved and created a bug - https://issues.unrealengine.com/issue/UE-62251. Hope it will be fixed in 4.20.2. Vote for bug if you can. 
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