
PHIGS (Programmer`s Hierarchical Interactive Graphics System) is an API standard for rendering 3D computer graphics, considered to be the 3D graphics standard for the 1980s through the early 1990s. Subsequently, a combination of features and power led to the rise of OpenGL, which became the most popular professional 3D API of the mid to late 1990....
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http://en.wikipedia.org/wiki/PHIGS

(from the article `computer graphics`) ...heavily on standard software packages. The OpenGL (open graphics library) specifies a standard set of graphics routines that may be implemented in ...
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http://www.britannica.com/eb/a-z/p/55

Programmers' Hierarchical Interactive Graphics Standards
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http://www.encyclo.co.uk/visitor-contributions.php
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