| Tobii Pro SDK C API
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| Data Fields | |
| TobiiResearchPoint3D | position_in_hmd_coordinates | 
| TobiiResearchValidity | validity | 
Provides properties for the HMD gaze origin.
| TobiiResearchPoint3D TobiiResearchHMDGazeOrigin::position_in_hmd_coordinates | 
The 3D coordinates that describes the gaze origin in (in mm).
| TobiiResearchValidity TobiiResearchHMDGazeOrigin::validity | 
The validity of the gaze origin data.