:Eye Tracking will obviously only work with a headset supporting eye tracking (like Vive Pro Eye or HP Reverb G2 Omnicapt). Just head orientation tracking will always work!

There is a GazeTest map in the Study Framework Demo project.

Usage

• In the StudySetup Actor set UseGazeTracker to EyeTracking (if you want to use the actual eye tracker) or HeadRotationOnly (which just approximates the gaze direction by the head's forward direction; it is the fall-back if no eye tracker is found and EyeTracking is chosen).
• Choose wich GazeTrackingBackend to use (for specifics look at the respective sub-pages)
• Object's that should be "gazeable" have to have one of the two components:
  • SFGazeTarget: This has it's own sphere collision which is used for line trace checks (so use this if only part of an actor should be gazeable or even a region greater than the actor itself).
  • SFGazeTargetActor: The whole actor is used for line trace checks.
  • both either use the name specified as TargetName or if USeActorName is activated, the name of the actor they are attached to.
• The GazeTracker (e.g. USFGameInstance::Get()->GetGazeTracker()) provides:
  • GetCurrentGazeTarget(): returning the name (TargetName or actor name) of the currently gaze at target or an empty string if nothing "gazeable" is looked at.
  • LaunchCalibration() to launch a calibration from code.
  • logs the currently gaze at target name and the gaze direction per frame into a separate file per participant. The participant's gaze tracking logs are located in the StudyLogs/GazeTrackingLogs folder. For head rotation logs, please refer to the Logging the Position of the Player section of the wiki.

Prerequisite

If you just want to use HeadRotationOnly as tracking mode, the following is not required.

Otherwise look at OpenXR Eye Tracking prerequisites or SRanipal prerequisites