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2D geometric model
A 2D geometric model is a geometric model of an object as a two-dimensional figure, usually on the Euclidean or Cartesian plane.
Even though all material objects are three-dimensional, a 2D geometric model is often adequate for certain flat objects, such as paper cut-outs and machine parts made of sheet metal.
2D geometric models are also convenient for describing certain types of artificial images, such as technical diagrams, logos, the glyphs of a font, etc. They are an essential tool of 2D computer graphics and often used as components of 3D geometric models, e.g. to describe the decals to be applied to a car model.
==2D geometric modeling techniques==
*simple geometric shapes
*boundary representation
*Boolean operations on polygons
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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