Box Ridigbody rotates faster left than right

Question

Hey all,

I t$$anonymous$$nk I have a pretty straight forward problem.

I have a rigidbody attached to a box collider and I am moving it foward with:

 m_rigidbody.AddForce((((inputAccel * SPEED) * transform.forward) * weight) * Time.deltaTime);

Weight is the actual weight of the rigidbody, SPEED is 2000, and the inputAccel is a float between -1 and 1.

That part seems to work fine, however; my issues come from rotating the rigidbody. W$$anonymous$$ch I do with:

 float angle = Mathf.Lerp(0, 180, Mathf.Abs(turn)) * turn;
 
 Quaternion deltaRotation = Quaternion.Euler(new Vector3(
       0, angle, 0
  ) * Time.deltaTime);
  m_rigidbody.MoveRotation(m_rigidbody.rotation * deltaRotation);

I've tried using AddTorque and I got t$$anonymous$$s code from https://docs.unity3d.com/ScriptReference/Rigidbody.MoveRotation.html

The rigidbody seems to turn sharper when moving along the ground right more so than left.

T$$anonymous$$s issue has been driving me crazy and thank you in advance for the help!

Answer 1

Answer by Bunny83 · Aug 13, 2019 at 12:10 AM

Have you actually confirmed that your turn value reachest the same value in the positive as well as in the negative area? Keep in mind that you have a quadratic saturation, so a small change when close to 1 or -1 will have a much larger impact on the angle than when close to 0.

Also are you sure you don't have and additional forces? For example the rigidbody could have an angularVelocity in one direction and your manual rotation has to work against it in one direction and is added in the other. Also make sure you don't collide with anyt$$anonymous$$ng w$$anonymous$$le rotating. If your object sits on the ground and is pushed down by gravity, make sure it's actually aligned with the ground perfectly. If your rotation axis is slightly tilted you may rotate an edge into the ground.

Finally I'd like to note that AddForce with ForceMode.Force (the default) does not need deltaTime and has to be used inside FixedUpdate. That's somet$$anonymous$$ng we can not verify from your code snippet. The force should be given in newtons. If you have trouble understanding the different force modes, see my answer over here

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josef_matulka · Aug 13, 2019 at 12:19 AM 0

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josef_matulka josef_matulka · Aug 13, 2019 at 02:48 AM 0

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Box Ridigbody rotates faster left than right

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