Mathf.Clamp and Character position doesn't seem to be working.

Unity Engine
1

Hello guy’s and gal’s.

I have been going through the forums for a good part of the day today and looking at examples of how developers are restricting the movement of a playable character to viewport of the screen. From my understanding this can be done using the camera’s function “View Port to World Point” and the Mathf.Clamp function. However, I have been messing with this all day and for some reason I can just still fly all over the screen with my character. Here is the script that I have created to just test the x values of the clamp. Thank you for looking and I hope someone can help me.

public class scriptCheckBounds : MonoBehaviour {   

    private float _xMin;
    private float _xMax;
    private Vector3 _yMin;
    private Vector3 _yMax;
    private Vector3 _position;

    // Use this for initialization
    void Start ()
    {
       
        _xMin = Camera.main.ViewportToWorldPoint(new Vector3(0, 0)).x;
        _xMax = Camera.main.ViewportToWorldPoint(new Vector3(1, 0)).x;
    }
   
    // Update is called once per frame
    void Update ()
    {
        _position = transform.position;
        _position.x = Mathf.Clamp(_position.x,_xMin,_xMax);
    }
}
2 
 transform.position = _position;