A limitation of a three-dimensional world in which objects in the distance may be represented in only two dimensions as a video on a screen occurs when a computer graphic object represented by computer graphics, e.g., in front of, to the side, above, or below the video screen, undergoes a trajectory...http://www.google.fr/patents/US6323861?utm_source=gb-gplus-shareBrevet US6323861 - Display techniques for three dimensional virtual reality
Display techniques for three dimensional virtual reality
