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Won't Fix
Votes
0
Found in
2019.3.0a2
2020.1
2020.2
2020.2.0a10
Issue ID
1244381
Regression
Yes
RigidBody loses its constraints when its GameObject is unparented and the parent has specific position values
How to reproduce:
1. Open user-submitted project (ConstraintsBugParent.zip)
2. Enter Play Mode
3. Select the Sphere in Scene View and see its positional gizmos
Expected result: the RigidBody Constraints are applied
Actual result: the RigidBody Constraints are not applied
Reproducible with: 2019.3.0a2, 2019.3.13f1, 2020.1.0b8, 2020.2.0a10
Not reproducible with: 2017.4.40f1, 2018.4.22f1, 2019.3.0a1
Notes:
Changing the PlayerParent transform Z value from 0.81 to 0.8 prevents this issue
Removing the unparenting line in the Movement.cs script(line 155) prevents this issue
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Resolution Note:
The rotational DoFs are applied in the mass-space, and looking carefully one might notice that there is non-identity inertia tensor rotation. It's non-zero because the centre of mass is shifted just a little. Setting it back to zero will fix this case.