WheelCollider requires an attached Rigidbody to function.

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Hi

I have a car GameObject with RigidBody component and children with WheelColliders my hierarchy looks like this:

Car (RigidBody)
- Mesh
  Body (Mesh Renderer, Mesh Filter, Box Collider)
  Wheel_1 (Mesh Renderer, Mesh Filter)
  Wheel_2 (Mesh Renderer, Mesh Filter)
  Wheel_3 (Mesh Renderer, Mesh Filter)
  Wheel_4 (Mesh Renderer, Mesh Filter)
- Wheels
  Wheel_1 (WheelCollider)
  Wheel_2 (WheelCollider)
  Wheel_3 (WheelCollider)
  Wheel_4 (WheelCollider)

When the scene is loaded the wheels give the following error:
"WheelCollider requires an attached Rigidbody to function."
However they work as they should. How can I eliminate this error message?

Answer 1

Best Answer

Answer by Edy · Feb 24, 2011 at 05:01 PM

Your hierarchy is correct. That problem surely comes from some script trying to configure functions at the WheelColliders prior to the rigidbody to be initialized.

Try setting up an empty scene containing a car with same hierarchy and no scripts at all. There should be no error here. Add your scripts one by one until you receive the error. Then try commenting out portions of the offending script until you find the exact code that causes the problem.

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Jrgen Heiling · Mar 04, 2011 at 12:34 PM 1

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There is also a bug in the WheelCollider. I have no problem when I instantiate my car, but when I load a new scene after calling DontDestroyOnLoad(myCar) I get the "WheelCollider requires an attached Rigidbody to function" error.

Pilot · Oct 15, 2011 at 07:46 AM 0

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I get the same when switching controllers (vehicle to player). Are there any new developments/ workarounds to address this bug? Or should this error simply be ignored (it doesn't seem to be effecting my game)?

Answer 2

Answer by zeropoint · Jun 23, 2011 at 06:59 AM

Following should solve ur problem suppose goCar is gameobject referring to Car (root of ur hierarchy), then while activating/re-activating the gameobject do this:

 goCar.active = true;
 goCar.SetActiveRecursively(true); // now wheel colliders will be able to find rigidbody since it has been made available in previous line

First line ensures that the rigidbody is already activated for the children activated by the second line.

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Answer 3

Answer by Justin Warner · Dec 10, 2010 at 09:23 PM

It's asking for a Rigidbody on the WheelCollider (Being the Wheel_1---4), so on those, add a Rigidbody under the components>physics tab up top...

And you could always take out the code where it says it requires it...

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hencz · Dec 11, 2010 at 08:18 AM 0

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It doesn't link to code, it comes from the WheelColliders. If I add rigidbodies the wheels will fall down.

Pilot · Oct 15, 2011 at 07:50 AM 0

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I am having the same problem when switching controllers (vehicle to player), and as hencz said, adding a Rigidbody to each wheel makes them simply fall through the floor! Does anyone know a workaround for this Unity bug?

WheelCollider requires an attached Rigidbody to function.

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