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By Design

Votes

0

Found in

2018.3.0b1

2019.1.0a1

2019.1.4f1

2019.2.0a1

2019.3.0a1

Issue ID

1158769

Regression

No

Wheel Collider is flickering when it moves through the small Objects

Physics

-

How to reproduce:
1. Open the "Repro1158769" Scene in the attached "Repro1158769.zip" Project
2. Enter Play Mode
3. Press W and drive through the logs

Expected Behaviour: The car drives through the small debris GameObjects and the wheels do not flicker
Actual Behaviour: The car Wheel Collider flickers/jumps when it drives through the small debris GameObjects

Reproducible with: 2018.4.2f1, 2019.1.6f1, 2019.2.0b5, 2019.3.0a5

Note: Could not test on 2017.4.29f1 and earlier than 2018.3.0b1 because of the breaking prefabs. If you move fast enough - the car flips upon impact with the debris.

  1. Resolution Note:

    We use a raycast based model from PhysX, and it's a classical approach known to require a smooth collision surface. It can't drive over debris because this causes the suspension raycasts hit at hugely varying heights and appear as if the suspension was being wildly compressed and elongated in very short periods of time - results in huge damper values applied as well as forces. I'd recommend to push out the debris with something like a fender, protect your wheel from hitting debris in the other words because it's unsolvable by the mathematical model underneath.

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