Wheel colliders are sleeping by default until disable/enable

Unity Engine
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1

Wheel colliders are sleeping until i disable and enable them again.

My vehicle goes through the ground. After poking around I just went ahead and disable/enable them and the vehicle started behaving as expected.

Current workaround

    foreach (var wc in wheelColliders)
    {
         wc.enabled = false;
         wc.enabled = true;
     }
2

Please file a bug with a minimal repro project so devs could be notified of the issue.

3

Sounds good! Filed the bug! Thanks

4

I have the same problem with 6000.2.0f1.

Do you have the link to the issue in the bug tracker?

Thanks,
Jus

5

Addition:
For me, the issue only seems to occur with dynamically added objects (cars).

Also, strange things happen when a car is removed from the scene. It seems that the WheelColliders of other cars partially break.

This is all new in 6.2.
6.1 worked without issues.

6

Hi, sorry heads down in crunch mode. Unity closed my bug as I didn’t have a good enough repro (they’re right about that)

It is runtime related as the prefab I provided doesn’t have running code and I too load vehicles on the fly.

The workaround I shared is good enough for me (and anyone that needs to unblock) as I’m in a rush but I’m hoping this gets fixed later on in their core code.

7

Thanks for the update! The workaround you shared works well for spawning vehicles (prefabs), but as I mentioned earlier, I’m still running into issues when trying to delete them. I haven’t found a workaround for that part yet.

I’m currently working on a sample project that can reliably reproduce the issue. Once that’s ready, I’ll submit a proper bug report to Unity.

8

Update:
I created a sample project with a simple reproduction szenario and submitted a bug report. I will let you know, if I get feedback.

9

Update:
Unity Issue Tracker - Wheel Collider does not interact with other colliders when the GameObject is destroyed and instantiated

10

I also have this issue when deleting objects. The only workaround I found, is to pool objects instead of deleting them. But this work if you need to delete entire object, not just part.