Focus 3 Eye Tracking and Unity OpenXR for Windows

[MGordonIMVR]

Hi, 

I was previously using the Vive Pro Eye and its eye tracking features, as that has been discontinued I got my hands on a Focus 3 and its Eye Tracking Module, but now Unity is crashing upon loading into any scene that is using the eye tracking. If I disable the eye tracking the crash does not occur, and I narrowed it down to the line "Error result = SRanipal_API.Initial(SRanipal_Eye.ANIPAL_TYPE_EYE, IntPtr.Zero);" in SRanipal_Eye_Framwork.cs that is causing the crash. 

I have the latest SRanipal SDK (1.3.6.6), the latest SRanipal runtime (1.3.2.0) and using Unity 2020.3.31f1. 

I have found this guide on setting up face tracking that says I need "SRanipal Runtime Version : 1.3.6.8 or later" which doesn't seem to be out yet. 
https://forum.htc.com/topic/14087-vbs-pc-vr-how-to-use-facial-tracking-on-focus3/

Does the Vive Focus 3s eye tracking currently support Unity Windows OpenXR over VBS? or am I missing something else?

[MGordonIMVR]

I also have VIVE OpenXR Plugin - Windows version 1.0.9

[KyleC]

Hi @MGordonIMVR,

Yes, you will need to upgrade SRAnipal runtime to latest version (1.3.6.8).

As stated in the post, you need to update the SRAnipal runtime below:

• Install Runtime  (Please joint Beta program)
  • Install or update the latest VIVE Software form  SteamVR  (2.1.22.1 or later)or OOBE (2.0.22.1 or later), and check your SR_Runtime
    (SRanipal Runtime Version : 1.3.6.8 or later) 

[MGordonIMVR]

I downloaded VIVE_SRanipalInstaller.msi from here : https://developer.vive.com/eu/support/sdk/category_howto/how-to-update-vive-eye-tracking-runtime.html and it asks to repair or uninstall, uninstalled and reinstalled restarting in between and still my SR_Runtime version says 1.3.2.0. Is that link out of date? 

[KyleC]

@MGordonIMVR Sorry, this link is out of date.

We now integrate the installtion/update of SRAnipal runtime into our SW package.

You need to install our VIVE SW (VIVE Console) to get your SRAnipal runtime update-to-date.

[MGordonIMVR]

@KyleC Thank you, I uninstalled the SRanipal version I had and installed the VIVE Console via Steam and it solved my crashing issue and got my eye tracking working again.