using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class ARCanvasTest : MonoBehaviour
{
    public Image image;

    void Start()
    {
        StartCoroutine (RequstCamera ());
    }


    IEnumerator RequstCamera()
    {
        //协程返回用户权限
        yield return Application.RequestUserAuthorization (UserAuthorization.WebCam);
        //如果用户有权限
        if (Application.HasUserAuthorization(UserAuthorization.WebCam)) {
            //获取所有的摄像头设备
            WebCamDevice[] device = WebCamTexture.devices;
            //记录摄像头的下标
            int index = -1;
            for (int i = 0; i < device.Length; i++) {
                //如果是后置摄像头
                if (!device[i].isFrontFacing) {
                    index = i;
                    break;
                }
            }
            //根据摄像头的名字，创建一个摄像机图像，展示到plane上
            WebCamTexture texture = new WebCamTexture (device[index].name);
            //将图像展示到image上
            image.canvasRenderer.SetTexture (texture);
            //启动摄像头
            texture.Play();
        }
    }

}