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

        }    
    }

    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);

    }