| Tobii Pro SDK C API
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| Data Fields | |
| TobiiResearchNormalizedPoint3D | user_position | 
| TobiiResearchValidity | validity | 
Provides properties eye user position guide.
| TobiiResearchNormalizedPoint3D TobiiResearchEyeUserPositionGuide::user_position | 
The (normalized) 3D coordinates that describes the user's position, (0.5, 0.5, 0.5) is the ideal position".
| TobiiResearchValidity TobiiResearchEyeUserPositionGuide::validity | 
The validity of the user postion guide.