Rotate the gameobject to the mouse is click

Unity Engine
1

The following script does not turn object correctly most turns it sideways or in the opposite direction to the mouse is click.

public class MoveUnit : MonoBehaviour {

 
    private bool flag = false;

    private Vector3 endPoint;

    public float duration = 50.0f;
   
    private float yAxis;

    public Transform rotateObject;
    public int speed;

    void Start()
    {
        yAxis = gameObject.transform.position.y;
    }

    void Update()
    {

        RotateObject();
 
        if ((Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began) || (Input.GetMouseButtonDown(0)))
        {

            RaycastHit hit;

            Ray ray;
            ray = Camera.main.ScreenPointToRay(Input.mousePosition);

            if (Physics.Raycast(ray, out hit))
            {
  
                flag = true;
  
                endPoint = hit.point;
 
                endPoint.y = yAxis;

            }
        }

        if (flag && !Mathf.Approximately(gameObject.transform.position.magnitude, endPoint.magnitude))
        {
     
            gameObject.transform.position = Vector3.Lerp(gameObject.transform.position, endPoint, 1 / (duration * (Vector3.Distance(gameObject.transform.position, endPoint))));

        }

        else if (flag && Mathf.Approximately(gameObject.transform.position.magnitude, endPoint.magnitude))
        {
            flag = false;
 
        }
    }

    void RotateObject()
    {
        Vector3 dir = new Vector3(endPoint.x, endPoint.y, endPoint.z);
        Quaternion lookRotation = Quaternion.LookRotation(dir);
        Vector3 rotation = Quaternion.Lerp(partToRotate.rotation, lookRotation, Time.deltaTime * speed).eulerAngles;
        partToRotate.rotation = Quaternion.Euler(rotation.x, rotation.y, rotation.z);

    }
}
2

try…

    public float degreesPerSecond = 90;

     void RotateObject()
    {
        var look= endPoint - partToRotate.position;
        var targetRot= Quaternion.LookRotation(look);
   
        // keep the math in Quaternion, it'll prevent the gimble lock
        partToRotate.rotation = Quaternion.RotateTowards(partToRotate.rotation, targetRot, Time.deltaTime * degreesPerSecond);
    }

also your Vector3.Lerp code is frame-dependent, so the speed won’t be consistent. try MoveTowards instead, specifying a speed instead of a duration

public float velocity;

 ...

if(flag)
{
   transform.position = Vector3.MoveTowards(transform.position, endPoint, Time.deltaTime * velocity);
   flag = !Mathf.Approximately(0,(transform.position-endPoint).sqrMagnitude);
}