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How to get an movement of pupils in real worls's distance unit or angle unit by VIVE Pro Eye?

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I need some help.

I need to get?an movement of pupils in real worls's distance unit(mm/inch) or angle unit(degree) using Vive pro eye.


So, I check the SRanipal SDK Doxygen file and find the description about GetPupilPostion API.


But I have a problem.

In Doxygen, pupil position is printed by (x,y)?coordinate.


However, I need to caculate the variation about pupil position by real unit(cm, mm, inch).?


How can I get It?


In other words, I'd like to know if 1, -1 in the?GetPupilPosition() is relative offset or absoulte offset by each person.


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