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   摄像机本身的depth越大，则它所渲染的东西越靠顶   

public GameObject CameraObj;public const int CAM_DEPTH = 2;public const int CAM_LAYER = 5;public void CreateCamere(){    CameraObj = new GameObject("myCamera");    Camera cam = CameraObj.AddComponent
   
    ();    cam.transform.localPosition = Vector3.zero;    cam.transform.localScale = Vector3.one * 0.002777778f;    cam.depth = CAM_DEPTH;    cam.cullingMask = 1 << CAM_LAYER;    cam.gameObject.layer = CAM_LAYER;    cam.clearFlags = CameraClearFlags.Depth;        cam.orthographic = true;        //投射方式：orthographic正交//    cam.orthographicSize = 1;       //投射区域大小//    cam.nearClipPlane = -2.7f;      //前距离//    cam.farClipPlane = 2.92f;       //后距离//    cam.rect = new Rect(0, 0, 1f, 1f);    UICamera uiCam = CameraObj.AddComponent
    
     ();    uiCam.eventReceiverMask = 1 << CAM_LAYER;}
    
   

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