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A "holodeck" is a fictional virtual reality facility featured in the Star Trek universe. It is often used for recreational activities. The holodeck is often used to recreate familiar places, participate in interactive stories, and to practice a variety of sports and skills. In the ''Star Trek'' universe, Holodeck environments and people are created by the use of "hard light" holograms, which are confined to the holodeck or other areas with "holographic projectors". In the real world there is no such technology although scientists predict virtual reality tools similar to the holodeck (but without the ability to touch) "will become a consumer-ready product by 2024." ==Features== The holodeck is depicted as an enclosed room in which objects and people are simulated by a combination of transported matter, replicated matter, tractor beams, and shaped force fields onto which holographic images are projected. Most holodeck programs shown in the episodes run in first person "subjective mode", in which the user actively interacts with the program and its characters. The user may also employ third-person "objective mode", in which he or she is "apart" from the actual running of the program and does not interact with it (all of the program's characters will ignore the user as if he or she was not there—this was shown in the ''Enterprise'' episode "These Are the Voyages..."). Matter created on the holodeck ("holomatter") requires the holoemitters to remain stable and will quickly disintegrate if it is removed from the holodeck without a mobile emitter to sustain it, although this principle has been overlooked in some episodes. Writer Phil Farrand has often pointed out how in many episodes matter from the holodeck that gets on a real person still exists when the real person exits the holodeck. In "Encounter at Farpoint", Wesley Crusher falls into a holodeck stream, but is still wet after exiting the holodeck. In "The Big Goodbye", Picard has lipstick on his cheek after encountering a holodeck simulation of a 20th-century woman. In "Elementary, Dear Data", Data and Geordi La Forge exit the holodeck with a piece of paper that originated in the holodeck.〔Phil Farrand. ''The Nitpicker's Guide for Next Generation Trekkers'' New York: Dell (1993)〕 This could be explained using replicated rather than holographic matter. In most episodes, the holodeck is controlled by voice commands, though physical controls have been shown in a few episodes. They also include safety protocols to protect the users. Some users may develop an addiction to the holodeck (a condition known as "holodiction"), leading to them spending unhealthy amounts of time there and personifying artificial characters. This was demonstrated by the Starfleet human character Reginald Barclay in the ''Voyager'' episode "Pathfinder" and ''The Next Generation'' episode "Hollow Pursuits". In the timeline of the fictional universe, the concept of a holodeck was first shown to humans in an encounter with the Xyrillian race in the ''Star Trek: Enterprise'' episode "Unexpected". In real-time, the holodeck is first presented as an idea called the 'Rec room' within the Star Trek animated series (released in 1974. During the episode 'The Practical Joker', Dr McCoy, Sulu and Uhura are trapped within it by the Enterprise (NCC-1701) computer. Holodeck variations of being by the sea, in a forest, falling down a pit and being being trapped in a snow-storm all having physical characteristics place the lives of McCoy, Sulu and Uhura at risk. During a scene from ''Star Trek: First Contact'' that took place 100 years before the events of ''Enterprise'', Jean-Luc Picard was in Earth's past and had a human from that time period named Lily along with him on board the Enterprise. When they were running from the Borg on his starship they hid in the holodeck, therefore introducing the technology before the events of "Unexpected". Scientists and researchers predict that variations of the holodeck will become a consumer-ready product (without matter materialization) by 2024 and that the actualization of Star Trek's holodeck in the future will make extensive use of artificial intelligence and cyborgs. Although the holodeck was described in the first season of ''Star Trek: The Next Generation'' as being fairly new technology (on starships), in the episode "Once Upon A Time" Captain Janeway and Harry Kim mention having used a holodeck as children. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「holodeck」の詳細全文を読む スポンサード リンク
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