Home Forums Unreal Engine 4 SDK WorldGazeDirection vs. HeadLocation


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    Dear Tobii Dev Team,

    I am fiddling around with the Unreal SDK for the Tobii EyeTracker 5 in a desktop setup.

    I tried to implement a custom Widget Interaction solution and ran into some issues.

    Doing a line trace from a static location, using the WorldGazeDirection Vector worked like a charme, no issues here.

    However, I would like to account for the changing head position of the user. Therefore I am updating the GazeOrigin using the HeadPoseData and feeding it into the start of the line trace.

    In theory when I gaze at one static point on the screen, the linetrace should always hit that point, However, as you can see in the gif, when I move my head, the hit location is moving a lot.

    (note: during the video recording I was constantly focusing my eyes at one specific point on the screen)

    Gaze Direction LineTrace Debug

    How is that possible?

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