requireHmd is false but still Could not initialize OpenVR: Error code: Init_HmdNotFound

[crdanfitz]

I am trying to use the SteamVR plugin for Unity without an HMD or controllers, but with a Tracker (2018).

I imported the camera rig but disabled the Camera and controllers. I then added an empty GameObject with Steam VR_Tracker Object script attached. See setup below.

When running in the editor, I get an OpenVR error:

[OpenVR] Could not initialize OpenVR. Error code: Init_HmdNotFound
UnityEngine.Debug:LogError (object)
Unity.XR.OpenVR.OpenVRLoader:Initialize () (at Library/PackageCache/com.valvesoftware.unity.openvr@411bd1ecffdc-1614121125000/Runtime/OpenVRLoader.cs:195)
UnityEngine.XR.Management.XRGeneralSettings:AttemptInitializeXRSDKOnLoad () (at Library/PackageCache/com.unity.xr.management@4.0.7/Runtime/XRGeneralSettings.cs:148)

I set requireHMD to false in Steam\config\steamvr.vrsettings so I was hoping it would continue when it failed to find an HMD.

System:
Unity Editor 2021.1.12f1
SteamVR: 1.21.4 beta
SteamVR plugin: 2.7.3 (sdk 1.14.15)
OpenXC Plugin: 1.2.8
Windows 10 Pro 64bit, 16GB memory, Nvidia Quadro M3000M

[JonOlive]

In my case Unity Editor (2021.3.18f1) immediately crashes on play if steam vr is not already open and at least one tracker visible.