Fundamentals of Wearable Computers and Augmented Reality, 2nd Edition

346 Fundamentals of Wearable Computers and Augmented Reality

AR environment, the distance from the virtual object to the viewpoint can be calcu-

lated using the Vincenty algorithm (Vincenty 1975). This algorithm interprets the

metric distance based on the geographical locations of the virtual object and the user.

The locations of the virtual objects are predened by the program. In a simulated

construction operation, for example, the geographical locations of virtual building

components and equipment are extracted from the engineering drawings. The loca-

tion of the viewpoint, on the other hand, is tracked by a position sensor (e.g., GPS)

carried by the user. A TOF camera estimates the distance from the real object to the

eye with the help of ...