Mixed reality (MR) is the merging of real and virtual worlds to produce new environments and visualizations, where physical and digital objects co-exist and interact in real-time. Mixed reality does not exclusively take place in either the physical or virtual world, but is a hybrid of reality and virtual reality, encompassing both augmented reality and augmented virtuality via immersive technology. The first immersive mixed reality system that provided enveloping sight, sound, and touch was the Virtual Fixtures platform, which was developed in 1992 at the Armstrong Laboratories of the United States Air Force. The project demonstrated that human performance could be significantly amplified, by overlaying spatially registered virtual objects on top of a person’s direct view of a real physical environment.

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