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===Philco headsight===
−The [[Philco headsight]] used a camera feed and a motion tracker.
−Motion tracked-HMDs can be used for immersive remote viewing of dangerous situations, for use in military.<ref>Philco [[Headsight]], by two Philco Corporation engineers, Comeau and Bryan</ref> An immersive gadget like this does not need to have a computer rendering system attached. It can be attached to a motion tracked camera using an electromagnetic tracking system. This type of gadget can use a video screen for each eye. In this type of system, the head movements of the user are replicated by a remote camera, allowing him to look around the environment.<ref name=”1”></ref>
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==History==
==History==
−===Ivan Sutherland===
===Ivan Sutherland===
−[[Ivan Sutherland]] developed the first headset with graphics that came from a computer.
+[[Ivan Sutherland]] developed the first headset with graphics that came from a computer. Beforehand, there was the [[Philco headsight]], which used a live analog camera feed and a motion tracker.
−Ivan Sutherland developed the concept of the “Ultimate Display”. This gadget could simulate the natural world so realistically that a user could not tell the difference between actual reality and virtual reality. The concept comprised of a virtual world viewed through an HMD and had augmented 3D sound and tactile feedback; computer hardware that created the virtual environment and maintained it in real time; and interactivity between users and objects from the VR world in a realistic way. Sutherland suggested that the gadget would serve as a “windows into a virtual world”, and his idea would become a core blueprint for the concepts that encompassed VR as of 2015.<ref name=”1”></ref><ref name=”2”></ref><ref name=”6”></ref>
+Ivan Sutherland and Bob Sproull created the Sword of Damocles, an HMD that was held by a mechanical arm mounted on a ceiling. The gadget was connected to a computer and displayed simple wireframe graphics to the user. The arm tracked the user’s head movements but was difficult to use. The contraption was also too heavy and bulky for comfortable use.<ref name=”1”></ref><ref name=”4”></ref><ref name=”6”></ref>
−Ivan Sutherland and Bob Sproull created the Sword of Damocles, an HMD that was held by a mechanical arm mounted on a ceiling. The gadget was connected to a computer and displayed simple wireframe graphics to the user. The arm tracked the user’s head movements but was difficult to use. The contraption was also too heavy and bulky for comfortable use.<ref name=”1”></ref><ref name=”4”></ref><ref name=”6”></ref>
+Ivan Sutherland also shared the concept of the “Ultimate Display”. This gadget could simulate the natural world so realistically that a user could not tell the difference between actual reality and virtual reality. The concept comprised of a virtual world viewed through an HMD and had augmented 3D sound and tactile feedback; computer hardware that created the virtual environment and maintained it in real time; and interactivity between users and objects from the VR world in a realistic way. Sutherland suggested that the gadget would serve as a “windows into a virtual world”, and his idea would become a core blueprint for the concepts that encompassed VR as of 2015.<ref name=”1”></ref><ref name=”2”></ref><ref name=”6”></ref>
===LEEP era===
===LEEP era===