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V scale (model railroading)
V-scale, Vscale, or V scale (with ''V'' standing for ''virtual reality''〔(Introduction to Vscale modeling ), publisher: http://www.virtualrailroader.com, accessdate: 17 August 2013〕) is a scale of model railroading utilizing self-defining three-dimensional models and a compatible graphics engine to create an alternative modeled world. Though it has not been classified or recognized by either the NMRA〔(NMRA Standards )〕 or MOROP,〔(THE NORMS )〕 the term Vscale has gradually taken on widescale defacto use in railfan and model railroading circles. V-scale model railroading was created when Japanese game developer Artdink released A-Train in 1985, but it was not widely popularized until Microsoft released ''Microsoft Train Simulator'' (sometimes referred to as ''MSTS'') and Australia's Auran/N3V Games released the successful family of Trainz railroad simulators, both in 2001. With the ability to enter into the cab of a modeled train consist in a modeled landscape and track system, the 'play' modes of the two simulators gradually established a following among rail enthusiasts.
==Scale and scope==
Unlike other scales, it is not a real world scale in the physical sense, but rather a representation of railroading in the virtual computing world, wherein dimensional constraints are mapped one-to-one with a virtual representation of the real world object. An centimeter is a centimeter, a meter maps to a metre, and a mile is a mile, unless the world builder decides to add an arbitrary scaling of his own.
Because there are no physical aspects to this scale, there are no limits (apart from those set by the program) as to the content that can be created. A V-scale railroad can literally be hundreds (and, in some cases, thousands) of simulated miles. Individual graphics objects (Track segment, a building, tree, fence, etc.) in such schemes are self-defining collections of source files grouped into a data-set interpretable by the graphics engine. Assigned an 'attachment' point in a virtual surface, graphics software enables three dimensional interaction such as walking around, climbing over top, and animation effects such as driving and watching passing virtual terrain. The computer operator becomes immersed in a virtual world modeled by the creator.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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