Unity Issue Tracker - [M1] Cinemachine Group Composer has different behavior when the Editor is at Debug or Release mode

Won't Fix

Votes

1

Found in

2021.3.7f1

2022.1.11f1

2022.2.0a18

2023.1.0a4

Issue ID

UUM-10178

Regression

Yes

[M1] Cinemachine Group Composer has different behavior when the Editor is at Debug or Release mode

Jul 27, 2022

Reproduction steps:

Open the attached project
Observe the “Main Camera” GameObject’s position in the Game View or the Scene View
Select the Debug Button in the bottom right of the Unity Editor Status Bar
Select “Switch to debug mode”
Observe the “Main Camera” GameObject’s position in the Game View or the Scene View

Expected result: The “Main Camera” GameObject is further away from the cube when the Editor is in Release mode
Actual result: The “Main Camera” GameObject is inside the cube when the Editor is in Release mode

Reproducible with: 2021.2.0a14, 2021.2.19f1, 2021.3.7f1, 2022.1.11f1, 2022.2.0a18, 2023.1.0a1, 2023.1.0a4
Not reproducible with: 2019.4.40f1, 2020.3.37f1, 2021.2.0a13, 2022.2.0a19, 2022.2.0b3

Reproducible on: M1 MacOS 12.4 (21F79)
Not reproducible on: Intel MacOS 12.4

Note: This issue is only reproducible on the Intel Editors running through Rosetta on M1 MacOS

Resolution Note:

We suspect this is a bug in the Mono JIT, Rosetta, or the interaction between the two of them. We don't plan to correct this.

Comments (1)

Yuchen_Chang

Dec 09, 2022 08:45

Hello! I've more information for this bug.

There is some really weird issue in CinemachineGroupComposer.cs line-217, that the calculation of a local variable named "targetDistance" is sometimes totally skipped (set to 0), if you don't "monitor" it. By "monitor", I mean Debug.Log() it, or set a break-point and check it's value.
It's a local variable (not a property with getter), so whether I monitor it or not, the value should not be changed. There is no "if()" or any other thing bothering the calculation, so I think it is some sort of compiler problem (or something similar).
(only happens in M1 mac + Intel Unity Editor (Rosetta) + release mode)

A whole explanation can be seen under this unity forum post:
https://forum.unity.com/threads/target-group-composer-with-dolly-has-a-weird-issue.1344227/#post-8523881

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