In the short run, the graphics displayed in the HMD will soon reach a point of near visual realism. The audio capabilities will move into a new realm of three dimensional sound, which refers to the addition of sound channels both above and below the individual or a Holophony approach. Within existing technological limits, sight and sound are the two senses which best lend themselves to high quality simulation. There are, however, attempts being made to simulate smell. The purpose of current research is linked to a project aimed at treating Post Traumatic Stress Disorder (PTSD) in veterans by exposing them to combat simulations, complete with smells. Although it is often seen in the context of entertainment by popular culture, this illustrates the point that the future of VR is very much tied into therapeutic, training, and engineering demands.
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