加一段代码，让vuforia识别度更高

using UnityEngine;

using System.Collections;

public class DuiJiao : MonoBehaviour {

// Use this for initialization

void Start () {

GameObject ARCamera=GameObject.Find("ARCamera");

Vuforia.CameraDevice.Instance.SetFocusMode(Vuforia.CameraDevice.FocusMode.FOCUS_MODE_CONTINUOUSAUTO);

}

// Update is called once per frame

void Update () {

Vuforia.CameraDevice.Instance.SetFocusMode(Vuforia.CameraDevice.FocusMode.FOCUS_MODE_CONTINUOUSAUTO);

}

}

把这个脚本挂在ARCamera上就可以了