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Weird graphic glitch on some Android devices

Discussion in 'Android' started by Miyavi, Oct 8, 2015.

  1. Miyavi

    Miyavi

    Joined:
    Mar 10, 2012
    Posts:
    58
    Hello, we're making a game at the moment and we're running into a glitch that happens on some Android devices (Samsung Galaxy s3 Mini, for example).

    As it's hard to explain, here's a gif of it: http://imgur.com/RevF6A2

    We use Spine for the characters, but I doubt that's the problem. Also, all the parts that are glitchless are done with Unity's built-in UI system, and the rest of the sprites (the background for the upper level counter, the world map background, etc) are just that, sprites. These have de Sprite-Default material assigned.

    Has anyone run into anything similar? Any guess on what's causing it?

    Thanks a lot in advanced.
     
    Miyavi, Oct 8, 2015
    #1

  2. FuzzyQuills

    FuzzyQuills

    Joined:
    Jun 8, 2013
    Posts:
    2,871
    It looks like a projection matrix issue, as a bad matrix (or a faulty GPU driver) can cause distortions like that.
    Mind if you send me a test APK? I have two devices I can test it on. :)

    EDIT: Actually, are you using a custom projection matrix. Yes, a bit outlandish for a 2D project, but still worth asking...
     
    FuzzyQuills, Oct 9, 2015
    #2

  3. Miyavi

    Miyavi

    Joined:
    Mar 10, 2012
    Posts:
    58
    Hello, sorry for the late reply.

    We're not using a custom projection matrix. We think it could be due to a graphics card problem, but it's weird because it only happen on certain devices.

    Unfortunately, we can't share an apk, so sorry about that, too :(
     
    Miyavi, Oct 16, 2015
    #3

  4. FuzzyQuills

    FuzzyQuills

    Joined:
    Jun 8, 2013
    Posts:
    2,871
    That's alright, the reason I pointed out the projection issue is because I saw a similar polygon glitch on a standalone unity 4.2 build on... *drums rolling* an ATI mobility radeon 345M! :D

    Anyway, hopefully the issue gets fixed. As for why I asked for the APK, look for a device with a Mali-400 MP in it, as that was the GPU hardware that I was going to test your issue on. Good luck in future endeavours. :)

    Also, what GPU does your test device have?
     
    FuzzyQuills, Oct 16, 2015
    #4

  5. Miyavi

    Miyavi

    Joined:
    Mar 10, 2012
    Posts:
    58
    Exactly a Mali-400. We also found people reporting that there was an actual bug in its drivers, which is what could be causing the glitch.
     
    Miyavi, Oct 20, 2015
    #5

  6. FuzzyQuills

    FuzzyQuills

    Joined:
    Jun 8, 2013
    Posts:
    2,871
    Yea, those things can be a pain to work with sometimes, although in my case, it's shader precision that often trips up my projects, usually some fancy water shader.

    That might also explain why asphalt 8 looked really weird on the mali GPU... If there's actually a bug, someone should fix it!
     
    FuzzyQuills, Oct 20, 2015
    #6