Smooth 2D rotation unexpected

Questions & Answers
1

Hi, I am trying to use smoothDamp to get a smooth 2D rotation going but I can’t seem to get the code right… Any help would be very appreciated!

using UnityEngine;
using System.Collections;

public class smoothCheck : MonoBehaviour {

    public Vector3 diff;
    public float rot_z;
    public float smoothTime = 0.3f;
    private float yVelocity = 0.0f;
    private float newPosition;


	void Update () {
        Vector3 diff = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
        diff.Normalize();
        rot_z = Mathf.Atan2(diff.y, diff.x) * Mathf.Rad2Deg;
        rot_z = rot_z - 90;
        float current = transform.eulerAngles.z;
        newPosition = Mathf.SmoothDamp(current, rot_z, ref yVelocity, smoothTime);
        transform.rotation = Quaternion.Euler(0.0f, 0.0f, newPosition);
	
	}
}

It seems like the rotation only works in quadrant 2 but not in quadrant 1,3,4. I am not sure what I am doing wrong…

2

debug your rotation like this:

for( int i = 0; i < 360; ++i )
{
  float x = Mathf.Cos( i*Mathf.Deg2Rad );
  float y = Mathf.Sin( i*Mathf.Deg2Rad );
  rot_z = Mathf.Atan2(y, x) * Mathf.Rad2Deg;
  rot_z = rot_z - 90;
  float current = transform.eulerAngles.z;
  newPosition = Mathf.SmoothDamp(current, rot_z, ref yVelocity, smoothTime);
  Debug.Log( rot_z );
  Debug.Log( current );
  Debug.Log( newPosition );
}