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== Causes ==
−Augmented reality largely comes from three main areas: artwork through photovideography, aerospace for military, and computers. First there was the [[stereoscope]] for viewing artworks. Then there was the idea of a tele-operation head-mounted display for use in aircraft, for example by Philco and the [[Bell helicopter company]]. Computers allow real-time graphics of a virtual scene to be drawn on a positionally tracked head-mounted display.
Environment tracking is the capability of a gadget to know its position and orientation relative to its environment. This is required so that the virtual imagery has correct [[registration]] to the real world.
Environment tracking is the capability of a gadget to know its position and orientation relative to its environment. This is required so that the virtual imagery has correct [[registration]] to the real world.
−The historical development of AR technologies intersects with that of virtual reality. During the initial stages of its evolution, the terms augmented reality and virtual reality had not been coined and, consequently, there wasn’t a clear distinction between the two <ref name=”1”> The Interaction Design Foundation. Augmented Reality - The past, the present and the Future. Retrieved from https://www.interaction-design.org/literature/article/augmented-reality-the-past-the-present-and-the-future</ref>.
The historical development of AR technologies intersects with that of virtual reality. During the initial stages of its evolution, the terms augmented reality and virtual reality had not been coined and, consequently, there wasn’t a clear distinction between the two <ref name=”1”> The Interaction Design Foundation. Augmented Reality - The past, the present and the Future. Retrieved from https://www.interaction-design.org/literature/article/augmented-reality-the-past-the-present-and-the-future</ref>.