unity3D 根据UI适配摄像机Rect值，完美解决分屏问题

using UnityEngine;
using System.Collections;

public class SetCameraRect : MonoBehaviour {
    [SerializeField]    Camera _CameraUI;
    [SerializeField]    Camera _Camera;
    [SerializeField]    Transform topLeft;
    [SerializeField]    Transform bottomRight;

    void Start（）
    {

        Vector3 t