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perspectivity
In geometry and in its applications to drawing, a perspectivity is the formation of an image in a picture plane of a scene viewed from a fixed point.
==Graphics==
The science of graphical perspective uses perspectivities to make realistic images in proper proportion. According to Kirsti Andersen, the first author to describe perspectivity was Leon Alberti in his ''De Pictura'' (1435).〔Kirsti Andersen (2007) The Geometry of an Art, page 1,Springer ISBN 978-0-387-25961-1〕 In English, Brook Taylor presented his ''Linear Perspective'' in 1715, where he explained "Perspective is the Art of drawing on a Plane the Appearances of any Figures, by the Rules of Geometry". In a second book, ''New Principles of Linear Perspective'' (1719), Taylor wrote
:When Lines drawn according to a certain Law from the several Parts of any Figure, cut a Plane, and by that Cutting or Intersection describe a figure on that Plane, that Figure so described is called the ''Projection'' of the other Figure. The Lines producing that Projection, taken all together, are called the ''System of Rays''. And when those Rays all pass thro’ one and same Point, they are called the ''Cone of Rays''. And when that Point is consider’d as the Eye of a Spectator, that System of Rays is called the ''Optic Cone''
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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