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Duplicate in 2019.2.X

Votes

0

Found in

2019.1.0a12

2019.2.0b5

Issue ID

1160649

Regression

Yes

[Physics 2D] GameObject having attached Relative Joint moves away from the Connected Rigidbody

Physics2D

-

Relative joint breaks and is not behaving in the intended way, on running the scene GameObject having attached Relative Joint moves away from the Connected Rigidbody

Steps to Repro:
1. Open attached project
2. Open RelativeJoint2D_AngularOffset Scene
3. Hit play

Actual Result:
Relative joint breaks and the star GameObject moves away from the Connected Rigidbody

Expected Result:
Star GameObject maintains relative position with the Connected Rigidbody

Occurring with:
2019.3.0a5, 2019.2.0b5, 2019.1.4f1, 2019.1.0a12

Working with:
2019.1.0a11, 2018.3.13f1

Tested using:
Windows 10, Mac 10.14

  1. Resolution Note:

    When we fixed the Box2D bug (https://github.com/erincatto/Box2D/issues/487) we started seeing this issue in my test project (cut-down version of that attached here). The problem however is that the test project had a bug itself in that the items rotating have a very, very low rotational inertia. In many cases this won't be an issue but in this case it makes the test set-up very unstable. Because the rotating objects have low rotation inertia and are constantly changing a high-velocity rotating target they overshoot. The inertia needs to be at least an order of magnitude larger.

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