[This post][1] should get you what your after its topic of conversation is leveling out an object after rotation such as collision but I would expect you could apply the same practice. If you are trying to clamp your rotation to a specifc axis I am doing somthing similar in a project I am working on now where I only want to rotate around the z axis; see below code which includes the stablization/level out bits
rigidbody.drag = positionalMovement.ComputeDrag(thrust, rigidbody.velocity);
rigidbody.angularDrag = rotationalMovement.ComputeDrag(turn, rigidbody.angularVelocity);
thrust *= (thrust > 0.0) ? positionalMovement.positiveAcceleration : positionalMovement.negativeAcceleration;
turn *= (turn > 0.0) ? rotationalMovement.positiveAcceleration : rotationalMovement.negativeAcceleration;
float stability = 1f;
float speed = thrust;
if(speed > 0)
{
Vector3 predictedUp = Quaternion.AngleAxis(
rigidbody.angularVelocity.magnitude * Mathf.Rad2Deg * stability / speed,
rigidbody.angularVelocity) * transform.up;
Vector3 torqueVector = Vector3.Cross(predictedUp, new Vector3(0f,0f,-1f));
//torqueVector = Vector3.Project(torqueVector, transform.up);
rigidbody.AddTorque(torqueVector * speed * speed);
}
rigidbody.AddRelativeTorque(new Vector3 (0f, turn * Time.deltaTime, 0f), ForceMode.VelocityChange);
rigidbody.AddRelativeForce (forwardDirection * thrust * Time.deltaTime, ForceMode.VelocityChange);
In the above I am using rigidbody by the way ( I am rotating left or right when A or D is pressed around the local Y which in this case is the world Z
[1]: http://answers.unity3d.com/questions/10425/how-to-stabilize-angular-motion-alignment-of-hover.html
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