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Votes

1

Found in

2020.2

2020.2.1f1

2021.1

2021.2

Issue ID

1312244

Regression

No

URDF robot using ArticulationBody collapses on itself and passes through colliders when Friction Type is set to be Directional

Physics

-

How to reproduce:
1. Open the attached project's "case_1312244-Project.zip" Scene labeled "TutorialPoseEstimation"
2. Enter the Play Mode
3. Observe the URDF robot

Expected result: Robot doesn't move and stays upright
Actual result: Robot collapses and passes through the Box Collider

Reproducible with: 2020.2.5f1, 2021.1.0b7, 2021.2.0a6
Couldn't test with: 2018.4.32f1, 2019.4.20f1 (Articulation Body Component is not available)

Note: Issue is not reproducible with Patch Friction Type

WORKAROUND: ArticulationBody will only apply the directional friction properly if the Temporal Gauss-Seidel solver is enabled.

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