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Hi @wrapcaesar, OK thanks for the confirmation that your application is interactive use only.
I am afraid however, it is not entirely clear what you are trying to achieve. I understand you wish to somehow circumvent the need for a new calibration per user based on head position? Or that the gaze co-ordinates should be modified to a specified margin according to head position?
Certainly, every new user requires a new calibration and any attempt to use the same calibration (even with modification) will almost certainly result in very poor tracking quality if any tracking at all is possible.
The Tobii hardware automatically compensates for head movement to determine gaze position on screen, so no action is required from the user end to implement this. What do you mean by ‘set a new gaze trace’?
Thanks for helping to clarify the situation, hopefully we can help you accordingly.