在使用vuforia sdk制作AR时候有时候会遇到的问题就是相机不对焦，相机对着一个图片时候在屏幕中显示的非常不清晰，之前的文字中也介绍了AR的相机对焦功能。
using UnityEngine;
using System.Collections;
using Vuforia;
public class RC_Tools : MonoBehaviour {
[Space(20)]
public bool AutofocusCamera = true;
public bool HideAndroidToolbar = true;
void Start () {
#if UNITY_ANDROID
if (HideAndroidToolbar) {
DisableSystemUI.Run();
DisableSystemUI.DisableNavUI();
}
#endif
StartCoroutine(Autofocus());
}
private IEnumerator Autofocus()
{
yield return new WaitForSeconds(1.0f);
if(AutofocusCamera) CameraDevice.Instance.SetFocusMode(CameraDevice.FocusMode.FOCUS_MODE_CONTINUOUSAUTO);
}
void onApplicationPause() {
StartCoroutine(Autofocus());
}
}