Supports OpenXR QR code tracking.

README.md

@@ -72,7 +72,19 @@ You can find the [full article on QR code tracking](https://docs.microsoft.com/w
 
 `QRCodesVisualizer.cs` - Handles all QR code visualizing in the scene and instantiates all QR codes in the local list kept in `QRCodesManager`.
 
-`SpatialGraphCoordinateSystem.cs` - This script is attached to the QR code object and transforms real-world QR code coordinates into the Unity coordinate system. The script also places the virtual QR code in the scene at the same location as the real-world QR code.
+`SpatialGraphNodeTracker.cs` - This script is attached to the QR code object and transforms real-world QR code coordinates into the Unity coordinate system. The script also places the virtual QR code in the scene at the same location as the real-world QR code.
+
+`SpatialGraphNode.cs` - This script is abstracting the tracking of a spatial graph static node, which represents the tracking information of QR code in a GUID id.
+
+## OpenXR sample
+
+Note that the ["main" branch](https://github.com/microsoft/MixedReality-QRCode-Sample/tree/main) of this sample is working with Unity's "Windows XR Plugin" which works with the WinRT APIs in in Unity 2019 or 2020 LTS versions.
+
+After upgrading to Unity 2020 or Unity 2021, You can also [use "OpenXR plugin" for HoloLens 2 developement](https://docs.microsoft.com/windows/mixed-reality/develop/unity/mixed-reality-openxr-plugin).  With OpenXR plugin, the app can use the built-in support for [SpatialGraphNode](https://docs.microsoft.com/dotnet/api/microsoft.mixedreality.openxr.spatialgraphnode), and the QR code tracking will work mostly the same way as above.
+
+To view the OpenXR version of the QRCode tracking on HoloLens 2, please checkout the "openxr" branch of this sample repro,  https://github.com/microsoft/MixedReality-QRCode-Sample/tree/OpenXR.  
+You can also inspect how to make modifications to existing QRCode Unity project to support OpenXR from this pull request: https://github.com/microsoft/MixedReality-QRCode-Sample/pull/18
+
 
 ## API Reference
 

Sample/Assets/Scripts/QRCode.cs

@@ -4,7 +4,7 @@
 using Microsoft.MixedReality.Toolkit.Input;
 using UnityEngine;
 
-namespace SampleQRCodes
+namespace Microsoft.MixedReality.SampleQRCodes
 {
     [RequireComponent(typeof(SpatialGraphNodeTracker))]
     public class QRCode : MonoBehaviour, IMixedRealityPointerHandler

Sample/Assets/Scripts/QRCodesManager.cs

@@ -6,7 +6,7 @@
 using System.Collections.Generic;
 using UnityEngine;
 
-namespace SampleQRCodes
+namespace Microsoft.MixedReality.SampleQRCodes
 {
     public static class QRCodeEventArgs
     {

Sample/Assets/Scripts/QRCodesSetup.cs

@@ -3,7 +3,7 @@
 
 using UnityEngine;
 
-namespace SampleQRCodes
+namespace Microsoft.MixedReality.SampleQRCodes
 {
     public class QRCodesSetup : MonoBehaviour
     {

Sample/Assets/Scripts/QRCodesVisualizer.cs

@@ -4,7 +4,7 @@
 using System.Collections.Generic;
 using UnityEngine;
 
-namespace SampleQRCodes
+namespace Microsoft.MixedReality.SampleQRCodes
 {
     public class QRCodesVisualizer : MonoBehaviour
     {

Sample/Assets/Scripts/SampleQRCodes.asmdef

@@ -1,9 +1,10 @@
 {
-    "name": "SampleQRCodes",
+    "name": "Microsoft.MixedReality.SampleQRCodes",
     "rootNamespace": "",
     "references": [
         "Microsoft.MixedReality.Toolkit",
-        "Unity.XR.WindowsMixedReality"
+        "Unity.XR.WindowsMixedReality",
+        "Microsoft.MixedReality.OpenXR"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],
@@ -17,6 +18,11 @@
             "name": "com.unity.xr.windowsmr",
             "expression": "1.0.0",
             "define": "UNITY_XR_WINDOWSMR"
+        },
+        {
+            "name": "com.microsoft.mixedreality.openxr",
+            "expression": "1.4.0",
+            "define": "MIXED_REALITY_OPENXR"
         }
     ],
     "noEngineReferences": false

Sample/Assets/Scripts/Singleton.cs

@@ -3,7 +3,7 @@
 
 using UnityEngine;
 
-namespace SampleQRCodes
+namespace Microsoft.MixedReality.SampleQRCodes
 {
     /// <summary>
     /// Inherit from this base class to create a singleton.

Sample/Assets/Scripts/SpatialGraphNode.cs

@@ -3,7 +3,7 @@
 
 using UnityEngine;
 
-namespace SampleQRCodes.WindowsXR
+namespace Microsoft.MixedReality.SampleQRCodes.WindowsXR
 {
     internal class SpatialGraphNode
     {
@@ -68,11 +68,7 @@ public bool TryLocate(out Pose pose)
                 pose = new Pose(translation, rotation);
                 return true;
             }
-            else
-            {
-                // Debug.Log("Id= " + id + " Unable to locate qrcode" );
-            }
-#endif // WINDOWS_UWP
+#endif
             return false;
         }
     }

Sample/Assets/Scripts/SpatialGraphNodeTracker.cs

@@ -3,9 +3,14 @@
 
 using UnityEngine;
 using Microsoft.MixedReality.Toolkit.Utilities;
-using SpatialGraphNode = SampleQRCodes.WindowsXR.SpatialGraphNode;
 
-namespace SampleQRCodes
+#if MIXED_REALITY_OPENXR
+using Microsoft.MixedReality.OpenXR;
+#else
+using SpatialGraphNode = Microsoft.MixedReality.SampleQRCodes.WindowsXR.SpatialGraphNode;
+#endif
+
+namespace Microsoft.MixedReality.SampleQRCodes
 {
     internal class SpatialGraphNodeTracker : MonoBehaviour
     {
@@ -23,7 +28,11 @@ void Update()
 
             if (node != null)
             {
+#if MIXED_REALITY_OPENXR
+                if (node.TryLocate(FrameTime.OnUpdate, out Pose pose))
+#else
                 if (node.TryLocate(out Pose pose))
+#endif
                 {
                     // If there is a parent to the camera that means we are using teleport and we should not apply the teleport
                     // to these objects so apply the inverse

Sample/Assets/XR/Loaders/Open XR Loader.asset

@@ -0,0 +1,14 @@
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