[Gaze origin and direction issue from GetGazeRay in Unreal Plugin]

@Krattrym If I divide by 1000 to convert into meter then I get all zero as gaze origin vector values are smaller. I actually need to calculate distance between object position in the scene and gaze origin where I got mostly static distance by using conversion. Any other way how to handle it? 

 

Thanks in advance.

[Convergence Distance in Eye Tracking SDK (SRanipal) v1.1.0.1]

Dear All,

I'm trying to calculate distance between gaze_origin(provided by API) and the target object using following code but the units are not same for these two points. So, how to get same type of coordinate system? 

var d = GameObject.Find("CubeObject").transform.position;

 var combine_gaze = eyeData.verbose_data.combined.eye_data.gaze_origin_mm;

 float dist = Vector3.Distance(d, combine_gaze);

 

Thanks in advance

[Distance calculation]

Hello guys,

I'm trying to calculate distance between gaze_origin(provided by API) and the target object using following code but the units are not same for these two points. So, how to get same type of coordinate system? 

var d = GameObject.Find("CubeObject").transform.position;

 var combine_gaze = eyeData.verbose_data.combined.eye_data.gaze_origin_mm;

 float dist = Vector3.Distance(d, combine_gaze);

 

Thanks in advance

[HMD Position Logging]

Hello @Corvus @HackPerception

I'm trying to calculate distance between gaze_origin(provided by API) and the target object using following code but the units are not same for these two points. So, how to get same type of coordinate system? 

var d = GameObject.Find("CubeObject").transform.position;

 var combine_gaze = eyeData.verbose_data.combined.eye_data.gaze_origin_mm;

 float dist = Vector3.Distance(d, combine_gaze);

 

Thanks in advance

[How to get current timestamp]

@Corvus @Tony PH Lin why timestamp feature is more important than other features like eye_diameter, eye_openness, eye_wideness? I used SRanipal 1.1.0.1. 

and chi square feature selection techniques to understand the important feature and it shows timestamp is more important. I need to understand why timestamp is more important.

I also found that timestamp has negative values but I don't know why. Could you please clarify it? 

 

[HMD Position Logging]

@Annabell Did you get head rotation? If so, how did you detect head rotation? 

[How to get values of eye position and head motion simultaneously?]

@Corvus  @HackPerception How can I get standard head rotation value using VIVE pro eye while watching different object in the scene? Any idea to get standard head rotation value? 

[How to Change Head Location]

Hello @lawwong @h-shirakami How can I get head rotation value using VIVE pro eye while watching object in the scene? Any idea to get standard head rotation value? 

 

Thanks in advance 

[How to get values of eye position and head motion simultaneously?]

@Corvus I did not find it in the SRanipal SDK documentation. Could you plz send me the link of this documentation? Thanks in advance

[How to get values of eye position and head motion simultaneously?]

I'm trying to measure gaze angles in these way from the scene Please let me know what you think @Corvus.

[How to get values of eye position and head motion simultaneously?]

Thanks @Corvus , I also need to measure gaze angles with different objects in the scene. Any suggestions how to measure it in a standard way? 

[How to get values of eye position and head motion simultaneously?]

Hello @Corvus @zhaoyanbo  I got eye data using API but how did you get  head motion? How can I get head rotation velocity using SDK api? 

Thanks in advance

[How to record Eye Image using vive pro?]

Thanks @Corvus 

Is tobii license free or paid? Can I take free license as a student? Do you have any contact information whom should I contact to get tobii license?

Thanks again

[How to record Eye Image using vive pro?]

Hello @Corvus @VIVE_Jason_Lu

Is there any way to capture eye image using vive pro? I searched but did not find the answer. Any suggestions?

 

Thanks in advance

Asish

[Blink rate per min]

Hello  @Corvus  @VibrantNebula  @Hank_Li

Would you please let me know how to calculate the number of blinks per min from eye openness data? Any standard way to get it correctly?

 

Thanks

[Blink rate per min]

Dear All,

Is there any standard way to calculate the number of blinks per min from eye openness data?

 

Thanks in advance

Asish

[Which unity version supported for SRanipal sdk sample project]

Hello @Corvus, Here is the log file you requested. Please take a look and let me know how to fix the issue.

ViveSR_Log.cab

SteamVR-2020-07-27-AM_11_15_42 report.txt

[Which unity version supported for SRanipal sdk sample project]

Hello @Corvus, @VibrantNebula

I created project and imported VIVE SR(SRanipal sdk 1.1.0.1) but   EyeSample_v2 does not run in unity 2017.4. When I run it, simply crashed unity and shut down.

Log file shows Unknown caused an Access Violation (0xc0000005)
  in module Unknown at 0033:10740380.

Also I tried with unity version 2018.2 and 2018.3 but sample project does not run on it.

Any suggestions?

[Vive Pro Eye Calibration Initialization Error Troubleshooting]

Hello @Hank_Li  I tried it many times and failed. If you say vive pro can't collect eye data in the last part then it does not make sense to me as I tried it many times and it failed. But last week calibration was successful many times while I was testing my project. Could you please provide any other suggestions.

Thanks

 

[Vive Pro Eye Calibration Initialization Error Troubleshooting]

Hello @VibrantNebula @Corvus 

Did you check my SR_RUNTIME log file to identify the issue why calibration is not initialized? I tried all solutions mentioned in this forum but still calibration is not working. Please take a look at my log file in the previous post and suggest me to fix this issue.

Thanks

 

[Vive Pro Eye Calibration Initialization Error Troubleshooting]

ViveSR_Log.cab Hello @VibrantNebula Here is the SR_RUNTIME log file.

[Vive Pro Eye Calibration Initialization Error Troubleshooting]

@VibrantNebula

I restarted my pc, run SR_RUNTIME and unity as admin but still calibration is failed. I tried at least times but no luck, even it was working last week. Please take a look at log and let me know how can I fix it.

 

Thanks.

 

SteamVR-2020-07-22-PM_05_44_51.txt

[How to get raw data of eye position?]

@Daniel_Y, Link  does not exist from previous post. Here is a similar question about gaze origin, https://community.viveport.com/t5/Vive-SRanipal-SDK/Vive-Pro-Eye-Finding-a-single-eye-origin-in-world-space/gpm-p/31592#M20.The diagram is updated. The gaze origin is with repect to System Origin.

@iuilab, Did you get your answer? If so, Please let me know about gaze_origin_mm  interms or left and right eye. If I take average of these two points, then does it mean the position of the object in the scene where user looked at? 

 

Thanks

[How to get output from the eye-tracker faster than Update in Unity]

Hello, 

I solved my issues. Now I'm getting 120hz output frequency. 

 

Thanks

 

 

 

 

[How to get output from the eye-tracker faster than Update in Unity]

Hello @Corvus, Thanks for your clarification. 

I recorded data by "Enable Eye Data Callback" and version 2. I modified the following code and recorded data. I got around 15k row for 70 seconds but it's supposed to record 8k (70 sec * 120 FPS = 8400 rows) row as output frequency is 120hz. Could you please tell me what's wrong with this?  

 

 

 public class SRanipal_GazeRaySample_v2 : MonoBehaviour
            {
                public int LengthOfRay = 25;
                [SerializeField] private LineRenderer GazeRayRenderer;
                private static EyeData_v2 eyeData = new EyeData_v2();
                private bool eye_callback_registered = false;

                private StringBuilder csv;
                string strFilePath = @"D:\Unity_workspace\eye_tracking2020\Tutorial4\Assets\Data.csv";
                string strSeperator = ",";
                static StringBuilder sbOutput = new StringBuilder();

                private void Start()
                {
                    sbOutput = new StringBuilder();
                    if (!SRanipal_Eye_Framework.Instance.EnableEye)
                    {
                        enabled = false;
                        return;
                    }
                    Assert.IsNotNull(GazeRayRenderer);
                }

                private void Update()
                {

                    if (Input.GetKey("up"))
                    {
                        startRecord();
                    }

                    if (Input.GetKey("down"))
                    {
                        stopRecord();
                    }
                }
                private void Release()
                {
                    if (eye_callback_registered == true)
                    {
                        SRanipal_Eye_v2.WrapperUnRegisterEyeDataCallback(Marshal.GetFunctionPointerForDelegate((SRanipal_Eye_v2.CallbackBasic)EyeCallback));
                        eye_callback_registered = false;
                    }

                   
                }

                private void stopRecord()
                {
                    File.WriteAllText(strFilePath, sbOutput.ToString());
                    File.AppendAllText(strFilePath, sbOutput.ToString());
                }

                private void startRecord()
                {
                    if (SRanipal_Eye_Framework.Status != SRanipal_Eye_Framework.FrameworkStatus.WORKING &&
                     SRanipal_Eye_Framework.Status != SRanipal_Eye_Framework.FrameworkStatus.NOT_SUPPORT) return;

                    if (SRanipal_Eye_Framework.Instance.EnableEyeDataCallback == true && eye_callback_registered == false)
                    {
                        SRanipal_Eye_v2.WrapperRegisterEyeDataCallback(Marshal.GetFunctionPointerForDelegate((SRanipal_Eye_v2.CallbackBasic)EyeCallback));
                        eye_callback_registered = true;
                    }
                    else if (SRanipal_Eye_Framework.Instance.EnableEyeDataCallback == false && eye_callback_registered == true)
                    {
                        SRanipal_Eye_v2.WrapperUnRegisterEyeDataCallback(Marshal.GetFunctionPointerForDelegate((SRanipal_Eye_v2.CallbackBasic)EyeCallback));
                        eye_callback_registered = false;
                    }

                    Vector3 GazeOriginCombinedLocal, GazeDirectionCombinedLocal;

                    if (eye_callback_registered)
                    {
                        if (SRanipal_Eye_v2.GetGazeRay(GazeIndex.COMBINE, out GazeOriginCombinedLocal, out GazeDirectionCombinedLocal, eyeData)) { }
                        else if (SRanipal_Eye_v2.GetGazeRay(GazeIndex.LEFT, out GazeOriginCombinedLocal, out GazeDirectionCombinedLocal, eyeData)) { }
                        else if (SRanipal_Eye_v2.GetGazeRay(GazeIndex.RIGHT, out GazeOriginCombinedLocal, out GazeDirectionCombinedLocal, eyeData)) { }
                        else return;
                    }
                    else
                    {
                        if (SRanipal_Eye_v2.GetGazeRay(GazeIndex.COMBINE, out GazeOriginCombinedLocal, out GazeDirectionCombinedLocal)) { }
                        else if (SRanipal_Eye_v2.GetGazeRay(GazeIndex.LEFT, out GazeOriginCombinedLocal, out GazeDirectionCombinedLocal)) { }
                        else if (SRanipal_Eye_v2.GetGazeRay(GazeIndex.RIGHT, out GazeOriginCombinedLocal, out GazeDirectionCombinedLocal)) { }
                        else return;
                    }

                    Vector3 GazeDirectionCombined = Camera.main.transform.TransformDirection(GazeDirectionCombinedLocal);
                    GazeRayRenderer.SetPosition(0, Camera.main.transform.position - Camera.main.transform.up * 0.05f);
                    GazeRayRenderer.SetPosition(1, Camera.main.transform.position + GazeDirectionCombined * LengthOfRay);

                }
                private static void EyeCallback(ref EyeData_v2 eye_data)
                {
                    eyeData = eye_data;

                    var L_dia = eyeData.verbose_data.left.pupil_diameter_mm;
                    var l_openness = eyeData.verbose_data.left.eye_openness;
                    var l_gaze_origin = eyeData.verbose_data.left.gaze_origin_mm;
                    var l_gaze_dir_norm = eyeData.verbose_data.left.gaze_direction_normalized;
                    var l_pupil_pos = eyeData.verbose_data.left.pupil_position_in_sensor_area;
                  

                    var R_dia = eyeData.verbose_data.right.pupil_diameter_mm;
                    var R_openness = eyeData.verbose_data.right.eye_openness;
                    var R_gaze_origin = eyeData.verbose_data.right.gaze_origin_mm;
                    var R_gaze_dir_norm = eyeData.verbose_data.right.gaze_direction_normalized;
                    var R_pupil_pos = eyeData.verbose_data.right.pupil_position_in_sensor_area;

                    var newLine = string.Format("{0},{1},{2},{3},{4},{5},{6},{7}", L_dia, l_openness, l_gaze_origin, l_gaze_dir_norm, l_pupil_pos, R_dia, R_openness, R_gaze_origin, R_gaze_dir_norm, R_pupil_pos);

                    sbOutput.AppendLine(newLine);
                    

                }
            }