Limited Rotate

Unity Engine
1

Hello,
How can i add limit for accelerometer rotation? I want add 20 degree but I could not.

var xMinLimit = -20;
var xMaxLimit = 20;

function Update () {
     var tilt = Input.acceleration.x;
     tilt = Mathf.Clamp(tilt, xMinLimit, xMaxLimit);
     transform.Rotate(Vector3.forward * tilt * 2);
}
2

Ah yes in order to do this what I would use a Lerp or Slerp function.
So basically do this.

Create 2 Quaternions a min and max.
Then, because the expected input is between -1.0f and 1.0f we can then stream line the data. But, since Lerp or Slerp cannot take in a negative number, we need to then shift the number line over by 1 and divide by 2. So we have values between 0.0f and 1.0f. So between -20.0f and 20.0f the value will be 0.0f that is half way on the Lerp and Slerp functions so when they tilt toward -1.0f it will be getting closer to 0.0f meaning the rotation moves toward -20.0f and vise versa. So this is how you do it.

    Quaternion minRotation = Quaternion.Euler(new Vector3(0.0f, 0.0f, -20.0f));
    Quaternion maxRotation = Quaternion.Euler(new Vector3(0.0f, 0.0f, 20.0f));

    void Update() {
        Quaternion newRotation = Quaternion.Lerp(minRotation, maxRotation, (Input.acceleration.x + 1.0f) / 2.0f);
        this.transform.rotation = newRotation;
    }

Hope this helps

1 Like
3

Thank you very much Polymorphik. it worked.

4

If you want to have it be smooth just use and other Lerp function on this.transform.rotation so you have can have it be smooth transition

5

Thanks