Question by larku · Jan 19, 2015 at 03:48 PM · rendering bug 4.5

Unity stops rendering

Hey all, seeking some wisdom, ideas, anything.

I acknowledge that the info I provide here is vague but it's all I have and I'm desperate.

I have a production iOS game that calls out to a third party SDK and they draw over our game with their own UI, we have a bug/issue where sometimes (less than 1 in 100 times) where upon return to our game the rendering ceases. We load a different scene and everything appears to work except nothing is rendered to the screen - the screen is left with the content from the previous scene (which happens to be a black blank screen) any ideas on what might be going wrong?

The process is:

1) Load empty scene that has 1 camera and a delegate object to receive callbacks from the third party SDK.

2) Call third party SDK - this draws their own UI (native iOS, not Unity) they do something with UIControllers or something to draw over our game.

3) Thrid party SDK calls back to our delegate (in the empty scene) we then load the next correct game scene.

4) Game scene loads but nothing renders - it's still showing the empty scene's content (we set the blank scene's camera's background to 0,2,0 so we can identify what is left rendered on the screen).

5) Although nothing is rendered the game runs properly (we can interact with it and hear the correct things happening - touch events are functioning etc) so we know we loaded the scene correctly.

I'm totally at a loss how to start addressing this. Any ideas, hints, etc would be greatly appreciated.

Using: Unity 4.5.5p5, also happens with 4.5.5f1

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SaraCecilia · Jan 19, 2015 at 03:51 PM 0

Hi, did you create a bug report for this as well? http://unity3d.com/BugReportingFAQ

larku · Jan 19, 2015 at 03:54 PM 0

No, I don't have a crash log or any real information for Unity to work with. And it's not reproducible. Do you think it's worth creating one still?

unimechanic ♦♦ · Jan 19, 2015 at 07:04 PM 0

If you can share the Unity project with our QA engineers they should be able to reproduce it, so submit the bug report and reply here with the bug case number. How to submit: http://blogs.unity3d.com/2009/04/15/bug-reporting-and-you/

larku · Jan 20, 2015 at 01:53 AM 0

Hi @unimechanic,

This is a full production project with associated IP - are you suggesting I give our entire project source to the Unity QA engineers?

unimechanic ♦♦ · Jan 20, 2015 at 01:39 PM 0

If you can isolate the problem into a $$anonymous$$imal project, that would actually be better for QA and developers. Otherwise the full project would be required.

larku · Jan 20, 2015 at 02:02 PM 0

Hi @unimechanic,

I've created a project with the $$anonymous$$imum that we think will reproduce the issue and we're now attempting to reproduce it with this version. Some complications that perhaps you can suggest how to address:

1) Bug only occurs on iOS - the project can only be used on iOS due to the third party SD$$anonymous$$ involved.

2) In our experience this bug only happens on specific devices (iPhone 4s and iPad $$anonymous$$i retina are known to have this issue) - I'll note this in the bug report.

3) The procedure to make the bug happen requires switching to and from the third party SD$$anonymous$$ - this could take hundreds of attempts before the issue is seen - we are going to verify that it happens with this project before sending. Are your QA engineers going to be able to do this process hundreds of times? (note, it has happened on the 2nd attempt in the past, but being non deter$$anonymous$$istic an see$$anonymous$$gly random it could take 1 or 500 tries to reproduce)

4) Project requires third party integration into resulting XCode project. I'll include a fully integrated working XCode project with my bug report if possible - if you'll need a new XCode project the integration will need to be done again on your end - is that doable if I provide instructions?

5) The project I provide to illustrate the issue will need to have the bundle identifier changed and you'll need corresponding apple dev certificates and provisioning profiles to suit - will that be doable?

Thanks for your assistance!

unimechanic ♦♦ · Jan 20, 2015 at 02:54 PM 0

Let our QA engineers know about those requirements in the bug report and they will take care of that.

larku · Jan 20, 2015 at 03:11 PM 0

Hi @unimechanic, Cheers, will do.

unimechanic ♦♦ · Jan 20, 2015 at 03:34 PM 0

Don't forget to reply with the bug case number :)

hoshurik · Apr 11, 2016 at 07:46 AM 0

@larku , have you managed to fix the problem? What was the issue?

Vorlex · Apr 12, 2016 at 01:58 PM 0

Hi! We got same issue with third party advertisement SD$$anonymous$$. Did you manage to fix this issue?

larku · Apr 14, 2016 at 11:56 PM 1

Hey @Playlabs, @Vorlex

This issue is fixed but it was in the 3rd party SD$$anonymous$$ and unfortunately I don't know much about the fix other than I think it had to do with explicitly calling UnitySetPlayerFocus(0); UnityPause(true); when they take focus and calling UnityPause(false); UnitySetPlayerFocus(1); when they return focus to Unity.

Sorry I can't be more help.

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