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Question by myotoxi_com · Sep 25, 2015 at 12:25 PM · iosphysics2dil2cpp

IL2CPP compatibility in iOS

My game based on Physics2D has feature that playback a replay data by simulating user Input. But, In iOS enabled IL2CPP, playback does not work. It seems to have a slight deviation.

Should i report to issue tracker ? or avoid playback by simulating user Input ?

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avatar image JoshPeterson · Sep 25, 2015 at 12:28 PM 0
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If the error only occurs with the IL2CPP scripting backend and not with the $$anonymous$$ono scripting backend, then it is likely a bug, so please submit a bug report in the editor.

avatar image myotoxi_com JoshPeterson · Sep 26, 2015 at 02:10 AM 0
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Yes, it works fine with the $$anonymous$$ono scripting backend. I try to create $$anonymous$$imum project to reproduce and submit later. Thanks!

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Answer by Dave-Carlile · Sep 25, 2015 at 12:28 PM

Last time I researched it, the Unity physics simulation was not guaranteed to be deterministic across devices or compilers. If anything runs in a different order on a different machine, or even the same machine, you will eventually have problems with accumulated rounding errors.

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avatar image myotoxi_com · Sep 26, 2015 at 02:05 AM 0
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Thank you for answer. In my case using 21 rigidbodies and 1 Distance Joint, i get same result after calling FixedUpdate 16000 times on Unity Editor and Android devices. Even if not guaranteed, i will submit a report in order to obtain better results.

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