use of parallax vision in virtual reality systems

Parallax vision is built on the fact that human eyes see real world objects from two different angles. Eye muscles and cognitive processing of the human brain function synergistically to combine these two different pictures into perception a single picture with three dimensions. Muscles of each eye change the shape of each the lens to change the focus distance of the object viewed. Other muscles change the orientations of the eyes so that the angles of perception from the two eyes cross at that same distance. In real world vision, these operations of the two muscles work in harmony. In virtual reality, they may not match. When images are shown at great distances, then the size of the screen demanded for immersion is overly large in size and it is difficult to present different pictures to one's eyes. When pictures are displayed very close to one's eyes extraordinarily high picture resolution is needed and the operations of the two muscles of the eyes tend to conflict. Technical discussion of similar topics at Novint Technologies .

An object's edges separate it from the setting. The geometry of these edges also provides visual signals about its three-dimensionality. The edges around an object create its outline and are the link between interaction among things (including overlap, scale, and parallax as discussed) and the internal angle of the object. An object's inner edges bridge the outer boundaries of the object and its inner surfaces and textures. Together, the outer and inner edges of an object provide powerful cues about its 3D size, location, angle, and movement. There is additional discussion at Virtual Tours Portland, Oregon of interesting subjects.

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