Unity 2D图像识别 动态添加相片到图像库 AR Tracked Image

把图像加载到base64，然后用Texture2D加载，再添加到图像库。

	private Dictionary<string, GameObject> mPrefabs = new Dictionary<string, GameObject>();
	void Start()
	{
	 	mPrefabs.Add("Dragen", Resources.Load("DragenBox") as GameObject);
	 	//加载Resources目录下的组件
        mPrefabs.Add("Cube", Resources.Load("CubeBox") as GameObject);
        StartCoroutine(initRuntimeImage());

		btnCapture = GameObject.Find("btnCapture").GetComponent<Button>(); 
        btnCapture.onClick.AddListener(OnBtnCaptureClick);
	}

	/// <summary>
    /// 自定义截屏功能，截屏按钮点击触发
    /// </summary>
    public void OnBtnCaptureClick()
    {
        
            //应用中代码处理
            StartCoroutine(OnScreenShot());
    
    }

	/// <summary>
    /// 使用协程进行截屏添加到图像库
    /// </summary>
    /// <returns></returns>
    IEnumerator OnScreenShot()
    {
        ScreenShotCount  ;
        yield return new WaitForEndOfFrame();   //等到该帧渲染结束再开始截屏
        DebugLog.Log("OnScreenShot");
        try {
            //生成一个Texture2D (参数为：宽，高，纹理，是否使用映射)
            Texture2D tTexture2D = new Texture2D(Screen.width, Screen.height, TextureFormat.RGB24, false);
            //读取Texture2D到本身上
            tTexture2D.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0);
            //图片应用一下
            tTexture2D.Apply();

            if (ImgTrackedmanager.referenceLibrary is MutableRuntimeReferenceImageLibrary mutableLibrary)
            {
                try
                {
                    TestState = mutableLibrary.ScheduleAddImageWithValidationJob(tTexture2D, "ScreenShot"   ScreenShotCount, 0.1f);
                    DebugLog.Log("Adding runtime img "   TestState.status.ToString()   "--"   TestState.jobHandle.IsCompleted.ToString());
                    isAddingImage = true;
                }
                catch (InvalidOperationException e)
                {
                    DebugLog.Log($"AddImage Error  {e.Message}");
                }
            }
        }
        catch (Exception e)
        {
            DebugLog.Log("error :"   e.Message);
        }
    }

 /// <summary>
    /// 运行时添加图片库
    /// </summary>
    /// <returns></returns>
    IEnumerator initRuntimeImage()
    {
        DebugLog.Log("initRuntimeImage wait Coroutine");
        yield return null;
        mPrefabs.Add("Sphere", Resources.Load("SphereBox") as GameObject);
        string base64 = "";	//图像base64
        AddImage(base64, "Sphere");
    }

    void AddImage(string base64, string name)
    {
        if (ImgTrackedmanager.referenceLibrary is MutableRuntimeReferenceImageLibrary mutableLibrary)
        {
            try
            {
                Texture2D texture2D = Base64StringToImage(base64); ;
                TestState = mutableLibrary.ScheduleAddImageWithValidationJob(texture2D, name, 0.1f);
                Debug.Log("Adding runtime img "   TestState.status.ToString()   "--"   TestState.jobHandle.IsCompleted.ToString());
                 
            }
            catch (InvalidOperationException e)
            {
                Debug.Log($"AddImage Error  {e.Message}");
            }
        }
    }

 void OnTrackedImagesChanged(ARTrackedImagesChangedEventArgs eventArgs)
    {
        foreach (var trackedImage in eventArgs.added)
        {
        	//用协程来处理
            StartCoroutine(OnImagesChanged(trackedImage));
        }
    }

    IEnumerator OnImagesChanged(ARTrackedImage referenceImage)
    {
        while (referenceImage.trackingState == TrackingState.None)	//防止该对象不是tracking状态，下面获取到的坐标会是0,0,0
        {
            yield return new WaitForSeconds(0.1f);
            Debug.Log($"trackingState: "   referenceImage.trackingState.ToString());
        }
        Debug.Log($"OnImagesChanged: "   referenceImage.referenceImage.name   ", trackingState:"   referenceImage.trackingState);
        Debug.Log("location:("   referenceImage.transform.position.x   ","   referenceImage.transform.position.y   ","   referenceImage.transform.position.z   ")");
        
            Instantiate(mPrefabs[referenceImage.referenceImage.name], referenceImage.transform.position, referenceImage.transform.rotation);
    }

    /// <summary>
    /// base64编码的文本 转为Texture2D材质
    /// </summary>
    /// <param name="basestr">base64字符串</param>
    /// <returns>转换后的Bitmap对象</returns>
    public static Texture2D Base64StringToImage(string basestr)
    {
        Texture2D t2d = new Texture2D(1, 1);

        try
        {
            byte[] arr = Convert.FromBase64String(basestr);
            t2d.LoadImage(arr);
            Debug.Log("转换成功");
        }
        catch
        {
            Debug.Log("转换失败");
        }

        return t2d;
    }

参考：
ARFoundation之路－图像跟踪
AR tracked image manager

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