Timestamps/Eye tracking in Hololens 2

Question

Hello,

I have been using the MRTK package for the purpose of using the eye-tracking feature in Microsoft hololens 2. It is imperative to have accurate timestamps for gaze-based measures. So for the attached image it is showing the timestamps as dt in ms… I am not understanding why the values in ms keep increasing per row… It is not making sense/does not seem like an accurate timestamp or measure. Would anyone know how to optimize this column to get correct timestamps or whether there might be an issue in configuration that is leading to these increasing values?

This is what it looks like a bit:
UserId, SessionType, dt in ms, HeadOrigin.x, HeadOrigin.y, HeadOrigin.z, HeadDir.x, HeadDir.y, HeadDir.z, EyeOrigin.x,
tester, Session00, 9.7783, 0.1680879, 0.2498658, 0.8272444, 0, 0, 0, 0.1710101, 0.2455685, 0.8367639, 0.05120622,
tester, Session00, 35.0204, 0.1681334, 0.2498621, 0.8270898, 0, 0, 0, 0.1709489, 0.245572, 0.8367249, 0.05134779,
tester, Session00, 49.796, 0.1680565, 0.2499707, 0.8269751, 0, 0, 0, 0.1708769, 0.2455774, 0.8366824, 0.05147325,
tester, Session00, 62.6465, 0.1680334, 0.2500312, 0.8268728, 0, 0, 0, 0.1708067, 0.2455832, 0.8366396, 0.05158889,
tester, Session00, 69.7378, 0.167974, 0.2504369, 0.8264848, 0, 0, 0, 0.1707399, 0.2455907, 0.8365951, 0.05169488,
tester, Session00, 90.0078, 0.1678707, 0.250632, 0.8261859, 0, 0, 0, 0.1706859, 0.2456022, 0.8365454, 0.05174301,
tester, Session00, 109.7245, 0.1678509, 0.2506264, 0.8262096, 0, 0, 0, 0.1706337, 0.2456154, 0.8364946, 0.0517792,
tester, Session00, 119.8429, 0.1679612, 0.2505262, 0.8262923, 0, 0, 0, 0.1705758, 0.2456323, 0.8364434, 0.05181085,
tester, Session00, 140.0372, 0.1680796, 0.2503369, 0.8263314, 0, 0, 0, 0.1705205, 0.2456521, 0.8363898, 0.05181571,

Advice regarding this problem is greatly appreciated
Best,
Rozemun

Answer 1

Hello, Welcome to Microsoft Q&A,

In this sample, milliseconds are used to calculate the interval during replay. For details, you can check DemoVisualizer/Scripts/UserInputPlayback.cs. If you want to add the recorded content, you only need to customize the Header and specific Data in DemoVisualizer/Scripts/LogStructureEyeGaze.cs.

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