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UI Flicker (Screen Space Overlay -> Render Texture)

Discussion in 'UGUI & TextMesh Pro' started by Polymorphik, Dec 23, 2015.

  1. Polymorphik

    Polymorphik

    Joined:
    Jul 25, 2014
    Posts:
    599
    I have a Render Texture for a mini HUD for the center console of my cockpit. I want a UI to be displayed there so I decided to use the Unity UI interface. The HUD on the center console is via a Render Texture. I used a simple image to test out the scaling and when I move my ship the image flickers in an out of phase.

    I tried changing the clipping, and plane distance with no solution. I really need the UI to work on the center console as it is crucial for in-game feedback.

    If anyone has experienced this problem and has a fix I would be indebted, thanks!

    Specs
    OS: Windows 8.1 Pro x64 (Bootcamp -> MacBook Pro late 2014)
    Hardware
    CPU: i7-4558U 2.8 GHz
    RAM: 16GBs
    SSD: 500 GBs
    GPU: Intel Iris Pro (Possible GPU problem who knows)
    Unity: 5.2.3F1
     
    Polymorphik, Dec 23, 2015
    #1

  2. karl_jones

    karl_jones

    Unity Technologies

    Joined:
    May 5, 2015
    Posts:
    7,850
    Is the flickering z fighting between the console and the texture? Its hard to say without seeing it.can you not use a world canvas instead of render texture?
     
    karl_jones, Dec 24, 2015
    #2

  3. Polymorphik

    Polymorphik

    Joined:
    Jul 25, 2014
    Posts:
    599
    Thank you for getting back to me. I am working on Bootcamp so I don't have a native screen capture.

    Here is a screenshot, imagine the Red Square jittering ever so slightly as if it was 'catching' up, similar to how some cameras get jitter when following a player in Update when they move in FixedUpdate. And I did notice the Z axis for w/e reason was changing between -0.1 and 0.1. Here is the Hierarchy View.
     
    Polymorphik, Dec 24, 2015
    #3

  4. Polymorphik

    Polymorphik

    Joined:
    Jul 25, 2014
    Posts:
    599
    Here is a video, sorry did it with my phone.
     
    Polymorphik, Dec 24, 2015
    #4

  5. phil-Unity

    phil-Unity

    Unity UI Lead Developer Unity Technologies

    Joined:
    Nov 23, 2012
    Posts:
    1,226
    Its likely a issue with when the rendertexture is rendered. I'd try rendering that camera manually in a update loop to see if that helps.
     
    phil-Unity, Jan 4, 2016
    #5
    karl_jones likes this.

  6. DaveCrowdStar

    DaveCrowdStar

    Joined:
    Nov 13, 2015
    Posts:
    13
    I have the same problem and have found that rendering in the Update loop manually does solve the problem.

    However, I'm a little confused by this in general. Why doesn't it work in the normal Mono lifecycle? usually all of my monos update and I don't control the order. So I can set this mono to update later, but I feel like normally there is a clear Update then Render flow.

    Even when I flip a bool and then wait until the next frame and flip it back, the render texture gets garbage in it. It only works when I manually call render from the update loop.

    Why does it make sense to call Render from the update loop and not somewhere else?
     
    DaveCrowdStar, Jan 27, 2016
    #6