What angles and distances are in the vector calculation and tracking?
* This feature is no longer supported. The X, Y, and Z values are distances in mm from the camera. The point used to calculate this position is a rough estimate of the point of rotation of a person’s head. The position is calculated assuming the vector clip* is placed on the brim of a baseball cap on the user’s head. It is calculated by taking a normal to the plane formed by the vector clip. Human head rotation is a complex movement, so this point of rotation is a simplification of the problem. The angles returned by the API are simply the angles formed by the vector plane. Typically they are used as relative measures where the users “center” themselves to the camera. The algorithm for determining the position of the vector clip is proprietary.
