Movimento FPS

using UnityEngine;
using System.Collections;

public class FPS : MonoBehaviour {

    public float speedH = 2.0f;
    public float speedV = 2.0f;
    public Rigidbody m_Rigidbody;

    private float yaw = 0.0f;
    private float pitch = 0.0f;

    public float m_Speed = 5f;

    public void Start(){

        m_Rigidbody = this.GetComponent<Rigidbody>();
    }

    void Update () {
        yaw += speedH * Input.GetAxis("Mouse X");
        pitch -= speedV * Input.GetAxis("Mouse Y");

        transform.eulerAngles = new Vector3(pitch, yaw, 0.0f);


        if (Input.GetAxis("Vertical") != 0){
            m_Rigidbody.velocity = transform.forward * m_Speed * Input.GetAxis("Vertical");
        }

        if (Input.GetAxis("Horizontal") != 0){
            m_Rigidbody.velocity = transform.right * m_Speed * Input.GetAxis("Horizontal");
        }
    }
}