
252 Virtual Reality: Concepts and Technologies
Figure 12.4 Visualization of a driving scene using a head-mounted display. (Illustration: PSA Peugeot
Citroën, with permission)
Remarks:
It is necessary to know whether the vertical axis of the virtual location always remains
identical to the vertical axis of the real location where the observer is situated. In the
case of an observer whose head movements are registered, a BSA should restrain the
vertical of the virtual location for it to remain unchanged if there is any apprehension
that the user might tilt his head involuntarily in front of the screen or in the head-
mounted display. Another question