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Basic form of representation.
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In some systems, all objects are described as polygon surfaces.
For example, Inventor, Java3D.
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Polygons are easy to process, so rendering and display of objects
is speed up. Thus, some systems allow objects to be described in other
ways (such as splines), but reduce all objects to polygons for processing.
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For a polygon, the representation is exact. For other surfaces,
polygons are tiled in a polygon-mesh which approximates the object.
Usually, the basic polygon is a triangle
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