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Question by username132323232 · Jun 17, 2015 at 02:30 AM · ioscrashexceptionanti-aliasing

iOS: anti-aliasing causes exc_bad_access exception.

Hello. I'm getting an exc_bad_access exception in iOS when anti-aliasing is turned on. The exception happens in UnityBlitToBackBuffer. Does anybody know how to fix that without turning anti-aliasing off?

Thanks.

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Answer by Jason-RT-Bond · Jul 06, 2015 at 05:31 PM

I had this same issue arise recently with anti-alias on at the same time as setting the resolution to "Auto (Best Performance)". Either disabling anti-aliasing (as you mentioned) or setting the resolution to "Native" fixed it in my case.

Unity 5.1.1p3 XCode 6.4

My project is rather large to submit a bug report but it'd be good to come up with a reproduction case and report this to Unity Tech so they can address it.

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avatar image username132323232 · Jul 06, 2015 at 07:04 PM 0
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Jason, thank you so much for sharing. I had "Native" selected, but there was a call to Screen.SetResolution() with non-native resolution values. This was left from another build, so commenting it out solved the problem. I'm not sure it's even a bug, because there seems to be no reason to use resolution other than native on an iOS device.

Thanks again!

avatar image Jason-RT-Bond · Jul 06, 2015 at 07:17 PM 0
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I think the only reason would be for performance. It's definitely a bug, although I'm not sure how many people would be trying to combine upscaling for performance with anti-aliasing for beauty...

avatar image username132323232 · Jul 06, 2015 at 07:22 PM 0
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Is it necessary to submit a complete project with a bug report?

avatar image Jason-RT-Bond · Jul 06, 2015 at 07:28 PM 0
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It's usually best to provide a test project which demonstrates the issue if possible.

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