Control

    void FixedUpdate ()
    {
        float moveHorizontal = Mathf.Cos(cam.transform.rotation.eulerAngles.y * Mathf.Deg2Rad) *Input.GetAxis("Horizontal") + Mathf.Sin(cam.transform.rotation.eulerAngles.y * Mathf.Deg2Rad) * Input.GetAxis("Vertical");
        float moveVertical = Mathf.Cos(cam.transform.rotation.eulerAngles.y*Mathf.Deg2Rad)*Input.GetAxis("Vertical") - Mathf.Sin(cam.transform.rotation.eulerAngles.y * Mathf.Deg2Rad) * Input.GetAxis("Horizontal");
        Vector3 movement = new Vector3(moveHorizontal, 0.0f,moveVertical);
        Debug.Log(movement);
        rb.AddForce(movement.normalized*speed);
    }