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Question by Oyshoboy · Jun 14, 2017 at 01:58 PM · unity 5rotationphysicsmath

How to get Steering Wheel Rotation angle?

Hi Everyone! I want to get a steering wheel rotation angle, to aply it on car rotation.

But I'm Using EulerAngles, and it's returns only 360 type angle, without negative angles. I tried to get negative, and it works, but only from 0 to -180, and from 0 to 180.

How can I register , for example, a 720 negative rotation?

Thank you!

 public float SteeringWheelAngle;
     // Use this for initialization
     void Start () {
         
     }
     
     // Update is called once per frame
     void Update () {
         SteeringWheelAngle = transform.localEulerAngles.y;
         SteeringWheelAngle = (SteeringWheelAngle > 180) ? SteeringWheelAngle - 360 : SteeringWheelAngle;
 
     }




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Answer by elenzil · Jun 14, 2017 at 06:26 PM

one way is to track the previous value and handle the case where it wraps around.

 private float _syntheticAngle = float.NaN;
 private float _prevAngle      = float.NaN;
  
  // Update is called once per frame
  void Update () {
      SteeringWheelAngle = transform.localEulerAngles.y;
      SteeringWheelAngle = (SteeringWheelAngle > 180) ? SteeringWheelAngle - 360 : SteeringWheelAngle;

      if (float.isNan(_syntheticAngle)) {
          _syntheticAngle = SteeringWheelAngle;
          _prevAngle      = SteeringWheelAngle;
      }

      float dAngle = SteeringWheelAngle - _prevAngle;

      if (dAngle < -180) {
          // eg it hopped from -170 to +170
          dAngle += 360;
      }
      else if (dAngle > 180) {
          // eg it hopped from +170 to -170
          dAngle -= 360;
      }

      _syntheticAngle += dAngle;
  }

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