Patent ID: 11899204
Assignee: SNAP INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An electronic eyewear device adapted to be worn on the head of a user, comprising:
a frame;
at least one optical assembly within the frame;
at least one display located within the at least one optical assembly adapted to display a user interface;
a memory that stores instructions; and
a processor that executes the instructions to perform head tracking operations including:
determining a pitch angle A of the electronic eyewear device with respect to ground;
when the pitch angle A is in a first zone between a minimum pitch angle and a maximum pitch angle, setting an up vector for the user interface as equal to a world up vector relative to ground,
when the pitch angle A is in a second zone in a first transition angle region between a minimum pitch angle and a first angle region relative to a real world sky or in a second transition angle region between a maximum pitch angle and a second angle region relative to a real world ground, setting an up vector for the user interface as equal to an interpolated vector between a world up vector relative to ground and a head up vector for a user's head, or
when the pitch angle A is in a third zone in the first angle region relative to the real world sky or in the second angle region relative to the real world ground, setting an up vector for the user interface as equal to a head up vector for a user's head; and
rendering the user interface in alignment with the up vector.