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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