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I’m trying to implement a feature in HoloLens 2 that scans a QR code and renders a virtual model. I’ve been following the MixedReality-QRCode-Sample project (https://github.com/microsoft/MixedReality-QRCode-Sample) recommended by Wang in this Microsoft Q&A post (https://video2.skills-academy.com/en-us/answers/questions/1461102/how-to-implement-a-time-dependent-virtual-number-o). However, I’ve encountered a similar issue to these developers on GitHub (https://github.com/microsoft/MixedReality-QRCode-Sample/issues/21). Despite no errors or warnings in the console, hitting “Play” in the Unity editor does not cause a QR code to pop up in the scene in front of the user. This issue remains unresolved and seems to be affecting more and more people. I’m using Unity 2020.3.38.f1 and Visual Studio 2022. Any guidance on how to resolve this would be greatly appreciated.
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Hello, Welcome to Microsoft Q&A,
If a virtual model still doesn’t appear after you scan a physical QR code? In this project, a physical QR code, present in the real world, should be scanned using you HoloLens device first. When the physical QR code is read, a virtual rectangle object will be placed at the QR code coordinates. Then, when you click the virtual rectangular object, it will direct you to the website the QR code links you to. So, it’s not that a virtual QR code or a QR code picture will automatically appear in the scene at the beginning of the application.
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THX！I am a beginner in Hololens development. Could you please explain how to implement “In the HoloLens connected to Unity or with Remoting” mentioned in the “Running the sample” section of this project (https://github.com/microsoft/MixedReality-QRCode-Sample)?
I just used the remote debugging method to align the QR code, but no virtual model appeared:
Ensure that the PC and Hololens are using the same local area network.
Unity: window→XR→Holographics remoted for Playing Mode
Hololens: Start HoloGraphics Remoting player,
Unity error message: "Using Holographic Remoting requires the OpenXR loader to be enabled in the 'PC, Mac & Linux Standalone settings' tab, because the Unity editor runs as a standalone XR application." I clicked "Fix", then "XR Plug-in Management" popped up, and I checked the "Holographic Remoting remote app feature group".
After all the errors were resolved, I entered the IP into the "Remote Host Name" in Unity's "Holographics remoted for Playing Mode", and clicked "Play" as prompted.
Afterwards, I saw very blurry Unity virtual content in Hololens. When I turned Hololens, the virtual content did not change at all. Only when I adjusted the Unity perspective did the virtual content slowly change.
Most importantly, I aligned the Hololens with this QR code (https://video2.skills-academy.com/en-ca/windows/mixed-reality/develop/unity/images/qr-coordinatesystem.png) for about 4 minutes, but no virtual model appeared.
My attempt to build and then deploy the app to Hololens 2 failed, reporting the following error:
Hi, I’ve tested this project using remoting. The blurry virtual content you see in HoloLens at the beginning is likely Unity skybox.
In this project, if you test via Unity Editor with HoloLens connected using remoting, the virtual object will appear after you scan a physical QR code. However, it may not appear in the correct location. Therefore, you might need to look around to find it in your horizon. To determine if the virtual object has indeed been created in the scene, you can check your Hierarchy panel in Unity:
I recommend building and deploying this project to HoloLens for testing. I’ve also tested this project on HoloLens2, and it worked as expected - the virtual object appeared in the correct location after scanning a physical QR code. You can refer to Build and deploy to the HoloLens - Mixed Reality | Microsoft Learn and Using Visual Studio to deploy and debug - Mixed Reality | Microsoft Learn for instructions on how to build and deploy the project to your HoloLens.
THX! I still got some problems
To determine if the virtual object has indeed been created in the scene, please check if the “QRCode(Clone)” game object is created in the Hierarchy panel.
Before building the project, consider selecting the ARM64 configuration option for your build solutions. If it doesn’t resolve your issue, please refer to the following link based on the error messages you provided - c++ - error MSB3073: How do I fix this? - Stack Overflow.
Hi Li! Here is what I have after I fix all the problems in the project. It seems there were no such files in your screenshot.
It seems the “QRCode(Clone)” game object is not created in the Hierarchy panel.
I download from the main track of github
just wondering if it is convenient for you to have a zoom meeting to fix the problems, THX!
Hi, based on the image you’ve provided, the scene in this screenshot is not a complete QRCodesSample sample scene, or the project may have been corrupted.
In a complete QRCodesSample scene, you should be able to locate these game objects:
The sample scene can be found by navigating to Assets-> Scenes.
If you’ve already opened the target sample scene and still unable to find these game objects in the Hierarchy panel, please consider reimporting the project from the beginning.
Li 您好！这边找到了Assets->Scenes中的QRCodesSample但是点击运行后只有如下内容，而没有自动生成QRCode(Clone)。
但是我在Assets->Prefabs里面找到的名字很相似的“QRCode”（但不是"QRCode(Clone)"），我把它直接拖过去了之后点击运行就报错。请问如何解决？您下载的仓库是什么track？版本是多少？是怎么生成那个QRCode(Clone)的？也是自动发生的吗？还是像我一样直接从Assets->Prefabs里面找拖过去的
这个和MRTK的版本有关吗？您是手动给项目导入的MRTK吗？我导入的版本是这个
您是否方便分享一下 您那边运行成功的工程文件 非常感谢！
我发现虚拟模型是不会跟随QRcode的移动而移动，只是固定在场景中，但是教程文档（https://video2.skills-academy.com/en-ca/windows/mixed-reality/develop/unity/qr-code-tracking-unity）的名字叫“QR code tracking”，这让我很困惑。很有可能是我没有你截图里面的QRCode(Clone)，请问这个QRcode(Clone)在哪里可以获取
QRCode(Clone) is a duplicate of the prefab QRCode. It should be duplicated by the QRCodesVisualizer.cs script on the QRCodesManager game object while a physical QR code is being scanned.
If you are using Unity2020 or 2021, then you should try the sample under the OpenXR branch - GitHub - microsoft/MixedReality-QRCode-Sample at OpenXR.
For the benefit of others who might encounter the same issue, please note that currently only English support is available on the Q&A. Please repost a thread and describe your question in English.
If you continue to experience issues with this sample and wish to investigate further, you can submit a support ticket via https://aka.ms/hlsupport.
