Home Forums XR Discussions Determining of visual- and optical-axis of eye

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    Stephan Wyder

    Hello community,

    I’m working with a HTC Vive Pro Eye device, which contains eye tracking technology from Tobii. I’d like to determine the visual- and the optical-axis of the eye. To do so, 3D-coordinates of the following points are required in one common coordinate system: gaze origin, pupil center, point of gaze.
    Does anybody know, whether the required points are provided by one of the available APIs, and in case it should be required, if corresponding coordinate system transformations are available?

    Any advice is much appreciated!

    Grant [Tobii]

    Hi @stephan-wyderhelbling-ch, thanks for your query. Unfortunately both HTC’s own SRanipal SDK and the Tobii XR SDK (which operates on top of HTC) do not offer individual eye metrics but rather provide a vector combining both eyes together.

    The Struct containing the gaze ray for left and right eye combined is ‘TobiiXR_GazeRay’ which provides both the gaze origin and direction.

    You can read about this in more detail @ https://vr.tobii.com/sdk/develop/unity/documentation/api-reference/

    Perhaps this can be of use for your project? Please do check it out and let us know how you get on. Best Wishes.

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