| Tobii Pro SDK C API
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| Data Fields | |
| TobiiResearchHMDGazeDirection | gaze_direction | 
| TobiiResearchPupilData | pupil_data | 
| TobiiResearchHMDGazeOrigin | gaze_origin | 
| TobiiResearchHMDPupilPosition | pupil_position | 
Provides properties for the eye data when gotten from an HMD based device.
| TobiiResearchHMDGazeDirection TobiiResearchHMDEyeData::gaze_direction | 
The gaze direction data.
| TobiiResearchHMDGazeOrigin TobiiResearchHMDEyeData::gaze_origin | 
The gaze origin data.
| TobiiResearchPupilData TobiiResearchHMDEyeData::pupil_data | 
The pupil data.
| TobiiResearchHMDPupilPosition TobiiResearchHMDEyeData::pupil_position | 
The pupil position in HMD track box.