eye tracking Unity got crashed while getting eye tracking data by VIVE OpenXR Plugin

[KikyoNanakusa]

My Unity got crashed when I ran the script below. 

using UnityEngine;
using VIVE.OpenXR;
using VIVE.OpenXR.EyeTracker;

public class EyeTracker : MonoBehaviour
{
    void Update()
    {
        XrSingleEyeGazeDataHTC[] gazeData;
        XR_HTC_eye_tracker.Interop.GetEyeGazeData(out gazeData);

        if (gazeData != null)
        {
            XrSingleEyeGazeDataHTC leftGaze = gazeData[(int)XrEyePositionHTC.XR_EYE_POSITION_LEFT_HTC];
            if (leftGaze.isValid)
            {
                Debug.Log($"Left Eye Gaze Position: {leftGaze.gazePose.position.ToUnityVector()}");
                Debug.Log($"Left Eye Gaze Orientation: {leftGaze.gazePose.orientation.ToUnityQuaternion()}");
            }
            else
            {
                Debug.Log("Left Eye Gaze Data is Invalid.");
            }

            XrSingleEyeGazeDataHTC rightGaze = gazeData[(int)XrEyePositionHTC.XR_EYE_POSITION_RIGHT_HTC];
            if (rightGaze.isValid)
            {
                Debug.Log($"Right Eye Gaze Position: {rightGaze.gazePose.position.ToUnityVector()}");
                Debug.Log($"Right Eye Gaze Orientation: {rightGaze.gazePose.orientation.ToUnityQuaternion()}");
            }
            else
            {
                Debug.Log("Right Eye Gaze Data is Invalid.");
            }
        }

        XrSingleEyeGeometricDataHTC[] geometricData;
        XR_HTC_eye_tracker.Interop.GetEyeGeometricData(out geometricData);

        if (geometricData != null)
        {
            XrSingleEyeGeometricDataHTC leftGeom = geometricData[(int)XrEyePositionHTC.XR_EYE_POSITION_LEFT_HTC];
            if (leftGeom.isValid)
            {
                Debug.Log($"Left Eye Openness: {leftGeom.eyeOpenness}");
                Debug.Log($"Left Eye Squeeze: {leftGeom.eyeSqueeze}");
                Debug.Log($"Left Eye Wide: {leftGeom.eyeWide}");
            }
            else
            {
                Debug.Log("Left Eye Geometric Data is Invalid.");
            }

            XrSingleEyeGeometricDataHTC rightGeom = geometricData[(int)XrEyePositionHTC.XR_EYE_POSITION_RIGHT_HTC];
            if (rightGeom.isValid)
            {
                Debug.Log($"Right Eye Openness: {rightGeom.eyeOpenness}");
                Debug.Log($"Right Eye Squeeze: {rightGeom.eyeSqueeze}");
                Debug.Log($"Right Eye Wide: {rightGeom.eyeWide}");
            }
            else
            {
                Debug.Log("Right Eye Geometric Data is Invalid.");
            }
        }

        XrSingleEyePupilDataHTC[] pupilData;
        XR_HTC_eye_tracker.Interop.GetEyePupilData(out pupilData);

        if (pupilData != null)
        {
            XrSingleEyePupilDataHTC leftPupil = pupilData[(int)XrEyePositionHTC.XR_EYE_POSITION_LEFT_HTC];
            if (leftPupil.isDiameterValid)
            {
                Debug.Log($"Left Eye Pupil Diameter: {leftPupil.pupilDiameter}");
            }
            else
            {
                Debug.Log("Left Eye Pupil Diameter is Invalid.");
            }

            if (leftPupil.isPositionValid)
            {
                Debug.Log($"Left Eye Pupil Position: {leftPupil.pupilPosition}");
            }
            else
            {
                Debug.Log("Left Eye Pupil Position is Invalid.");
            }

            XrSingleEyePupilDataHTC rightPupil = pupilData[(int)XrEyePositionHTC.XR_EYE_POSITION_RIGHT_HTC];
            if (rightPupil.isDiameterValid)
            {
                Debug.Log($"Right Eye Pupil Diameter: {rightPupil.pupilDiameter}");
            }
            else
            {
                Debug.Log("Right Eye Pupil Diameter is Invalid.");
            }

            if (rightPupil.isPositionValid)
            {
                Debug.Log($"Right Eye Pupil Position: {rightPupil.pupilPosition}");
            }
            else
            {
                Debug.Log("Right Eye Pupil Position is Invalid.");
            }
        }
    }
}

Then I tried sample scene, that contain the script like above. However my unity crashed again. 

My environment is this

- Unity 2021.3.9f1

- VIVE OpenXR Plugin Version 2.4.2

- HMD: VIVE Pro eye

Because of  this situation, I googled about old versions of eyes and facial tracker SDK, but it seems HTC removed all sources. 
Like the URL below

- https://developer.vive.com/resources/vive-sense/eye-and-facial-tracking-sdk/download/latest/

Is there any way to track eye gaze data?
If anyone has the official URL that provide older versions of SDK ( it means non-OpenXR SDK) or know the method to do eye tracking by using current SDK (VIVE OpenXR Plugin), please teach me how.

[VIVE_chengnay]

Hi @KikyoNanakusa,

Could you check if your handtracking API layer is enabled?

Please refer to my previous reply.

We did find out that handtracking API layer will cause Unity crash.

If you disable handtracking API layer and Unity still crashes, please collect log for further investigation.

[Yuji_Inoue]

Hi, I am using Focus vision (Standalone, Not PCVR), it is working my environment.

Unity 2022.3.55f1

VIVE OpenXR Plugin Ver 2.5.0

HMD Focus Vision

[VIVE_chengnay]

Hi @Yuji_Inoue,

What error did you get?

[Yuji_Inoue]

HI, my app is work well.

I have another question, please tell me what geometric.eyeWide means. I guess it is Pupillary Distance data of eyeball.

Thank you