unity 开启外部摄像头

在unity中建立一个image作为摄像头显示画面，然后通过命令render到image上即可。

    public WebCamTexture webTex;
    public string deviceName;  

    void Start()
    {
          StartCoroutine(CallCamera())
    }
    void Update()
    {  

    }  ///
///调用摄像头
///
    IEnumerator CallCamera()
    {
        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
        if(Application.HasUserAuthorization(UserAuthorization.WebCam))
        {
            WebCamDevice[] devices = WebCamTexture.devices;
            deviceName = devices[].name;
            //设置摄像机摄像的区域
            webTex=new WebCamTexture(deviceName,,,); 
            GetComponent<MeshRenderer>().material.mainTexture = webTex;
            webTex.Play();//开始摄像
        }    
    }

抓取当前画面

    public void Capture()
    {
        //WebCamTexture wc = new WebCamTexture(160, 120);
        //wc.play();
        Texture2D t = new Texture2D(webTex.width, webTex.height);
        t.SetPixels(webTex.GetPixels());
        t.Apply();
        byte[] byt = t.EncodeToPNG();
        File.WriteAllBytes(@"D:/test.jpg", byt);
    }