eye position z is not an absolute value

[daihuaguan]

I want to get the distance of user form screen.
But I tested with different people and found that different values were obtained at the same distance. So,I suspect that the z value is not an absolute value.

How do I get the true distance of different users？

[Alex [Tobii]]

Hi! You can try to use the new low level api to get head coordinates in mm.
https://www.nuget.org/packages/Tobii.StreamEngine.Native/
https://www.nuget.org/packages/Tobii.StreamEngine/

This is a low level API so please only use it if you know why you are doing it. Very little support is going to be provided.

It’s worth noting that position signal (especially Z coordinate) is not very precise, but may be suitable for some use cases.

[daihuaguan]

I am sorry,when I was testing, I forgot to recalibrate everyone.
If re-calibration, then the z value of each person is basically accurate. However, compared with the actual value is always 100mm.

[Alex [Tobii]]

Hi! Nice that it worked for you.

[Author]

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