turn to mouse pointer 3d unity code example

Example: unity make 3d object spin towards mouse

public class LookTowardMouse : MonoBehaviour {      // Update is called once per frame     void Update ()      {                  //Get the Screen positions of the object         Vector2 positionOnScreen = Camera.main.WorldToViewportPoint (transform.position);                  //Get the Screen position of the mouse         Vector2 mouseOnScreen = (Vector2)Camera.main.ScreenToViewportPoint(Input.mousePosition);                  //Get the angle between the points         float angle = AngleBetweenTwoPoints(positionOnScreen, mouseOnScreen);          //Ta Daaa         transform.rotation =  Quaternion.Euler (new Vector3(0f,0f,angle));     }      float AngleBetweenTwoPoints(Vector3 a, Vector3 b) {         return Mathf.Atan2(a.y - b.y, a.x - b.x) * Mathf.Rad2Deg;     }  }