Bug DllNotFoundException: UnityOpenXR when trying to run deviceless on Mac

So the goal was to get a project set up using OpenXR and the XRI device simulator to allow for play-in-editor testing and debugging as I'm working on Mac and thus can't use on-device PIE.

To test this out, I created a fresh project in Unity 2020.3.26f1 (tried with 2021.2.7f1 with the same result) with the following packages:

• OpenXR Plugin 1.3.1
• Oculus XR Plugin 1.11.2
• XR Plugin Management 4.2.1
• XR Interaction Toolkit 2.0.0-pre.6
  • Default Input Actions sample imported
  • XR Device Simulator imported

I included the Oculus XR Plugin so that I could still deploy to the device as well as run in editor (since I'm ultimately targeting Quest devices). I configured XR Plug-in Management to target the OpenXR provider for standalone (PC/Mac/Win) and Oculus for Android, and configured the OpenXR provider to use the Oculus Touch Controller Profile on both standalone and Android.

After setting up the XRI input mappings, I created a scene with a simple ground plan, an XRRig (Action Based) and an XR Device Simulator and hit play, and got the error below. I get the same error even with a completely empty scene, so it's apparently not triggered by the XR rig or device simulator prefabs.

Here's the Unity 2021.2.7f1 version of the error:

DllNotFoundException: UnityOpenXR assembly:<unknown assembly> type:<unknown type> membernull)
UnityEngine.XR.OpenXR.OpenXRLoaderBase.Initialize () (at Library/PackageCache/com.unity.xr.openxr@1.3.1/Runtime/OpenXRLoader.cs:177)
UnityEngine.XR.Management.XRManagerSettings.InitializeLoaderSync () (at Library/PackageCache/com.unity.xr.management@4.2.1/Runtime/XRManagerSettings.cs:190)
UnityEngine.XR.Management.XRGeneralSettings.InitXRSDK () (at Library/PackageCache/com.unity.xr.management@4.2.1/Runtime/XRGeneralSettings.cs:175)
UnityEngine.XR.Management.XRGeneralSettings.AttemptInitializeXRSDKOnLoad () (at Library/PackageCache/com.unity.xr.management@4.2.1/Runtime/XRGeneralSettings.cs:148)

 

Bump. Anyone have any ideas on this?

 

I am targeting Android, which allows me to build and run on device. That works, but it's slow and doesn't allow me to debug via VS Code. What I'd like to be able to do is to run in editor in play mode with simulated hardware, which is what I thought the XR Device Simulator was for.

Does Unity not support the OpenXR stack on Mac at all? If not, is there a way I can at least conditionally disable OpenXR if I'm testing UI or other systems that don't need HMD and controller input?

 

@laurie71 did you get any solution for this? I am facing the same or similar problems.

 

Also interested in this. I have Oculus building fine other than that error. It will still run in the editor with that error. This is on a macbook pro M1. I've tried both silicon and intel Unity Editors.

 

I have had issues with having both the XR Interaction Toolkit and the Oculus Integration Asset installed. I had to remove the Oculus Integration Asset to get it to work correctly. I have the XR Interaction set to OpenXR, and the OpenXR set up to support the Quest which seems to make Unity happy.

 

Where or how do you remove it for Mac

 

This helped me to fix the error right now in the new 'mixed reality' example project from Unity:
https://forum.unity.com/threads/dllnotfoundexception-unitymockhmd.1314600/#post-8339382