###### tags: `Hololens2` `Vuforia` `Unity`

# Hololens2-Vuforia-Setup
## Environment
- **Windows SDK (10.0.22000)**
https://developer.microsoft.com/zh-tw/windows/downloads/windows-sdk/
- Visual Studio 2019 (Extra adds UWP development/Desktop development with C++/Game development with Unity)
- Unity Version: 2020.3.11f1
- Vuforia Version: 10.2.5
- MRTK Version: 2.7.2
__Recommend__
- Mixed Reality Feature Tool (Fast to setup MRTK)
https://www.microsoft.com/en-us/download/details.aspx?id=102778

## Install Vuforia into Unity
1. Import Assets from
https://assetstore.unity.com/packages/templates/packs/vuforia-hololens-1-2-sample-for-unity-2020-3-lts-101553
3. Unity Build Settings -> UWP

## Build And Depoly to hololens
1. Build Settings / Player Settings / Capabilites /
Check **PicturesLibrary**, **VideosLibrary**, **WebCam**, **Microphone**, **SpatialPerception**
2. Build Settings / UWP / Build (Nothing to change)
3. Build path ... / HololensDemo.sln (Open with Visual Studio 2019)
4. Deploy Select Devices (Debug / ARM / Devices) / Run

## Pair Developer Mode
1. 首先先將藍芽與開發的PC配對
2. Settings/Update&Security/ForDevelopers
所有選項都開啟(UseDeveloperFeatures/DevicesDiscovery/DevicePortal)
3. 回到 Visual Studio, 進行 Depoly, 第一次進行Depoly時, 會出現輸入 PIN 選單
4. 需要回到 Hololens2 Settings/Update&Security/ForDevelopers DevicesDiscovery 選項, 按下Pair
5. 輸入 PIN
6. 完成就可以進行 Depoly

若找不到 Device 可以參考以下:
https://stackoverflow.com/questions/62606869/deploying-with-visual-studio-2019-to-hololens-2

## Using the Windows Device Portal
https://docs.microsoft.com/en-us/windows/mixed-reality/develop/platform-capabilities-and-apis/using-the-windows-device-portal

## Live-streaming / Video Capture
https://www.microsoft.com/store/productId/9NBLGGH4QWNX

## Issue
1. Certificate could not be opened: WSATestCertificate.pfx.
如果更動 WSATestCertificate.pfx 可能會發生以上 error.
解決辦法:




解決辦法:
更動APP名稱, 在重新Depoly
3. Hololens 無法連到 Windows Store, Error Code: 0x80131500
解決辦法:
重置 Hololens, 開始地區選擇US.

## Reference
- UNITY MRTK Setup
https://www.youtube.com/watch?v=wSPXTRYxq9A
- MRTK for Unity
https://github.com/microsoft/MixedRealityToolkit-Unity
- Hololens+Vuforia setup in unity
https://www.youtube.com/watch?v=o0ybVu9SB7g
- Vuforia offical
https://library.vuforia.com/articles/Solution/Working-with-the-HoloLens-sample-in-Unity.html

# Others
## Install MRTK into Unity (Only use MRTK)
1. Unity Build Settings -> UWP
2. Player Settings / XR management -> Mixer Reality or OpenXR (Need to import ***Mixed Reality OpenXR Plugin*** from ***Mixed Reality Feature Tool***)
3. Import MRTK (Version 2.7.2) Foundation/Example/Extension or import example from ***Mixed Reality Feature Tool***.

# Holographic Remote Player
1. http://www.prochainsci.com/2020/11/hololens-12-2020-holographic-remote.html
2. https://docs.microsoft.com/en-us/windows/mixed-reality/develop/unity/unity-play-mode?tabs=openxr

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# QRCode Tracking

## Version
* Unity Version: 2020.3.28f1
* MRTK Version:
* MixedRealityToolkit.Extension (QRCode Tracking)

Sample project
https://github.com/shinn716/MixedReality-QRCode-Sample

## Reference
1. https://github.com/microsoft/MixedReality-QRCode-Sample
2. https://localjoost.github.io/Reading-QR-codes-with-an-MRTK2-Extension-Service/
3. https://localjoost.github.io/Positioning-QR-codes-in-space-with-HoloLens-2-building-a-'poor-man's-Vuforia'/
4. https://www.youtube.com/watch?v=BKJ6sjJ9oao

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