PHIGS Acronym for Programmer's Hierarchical Interactive Graphics System, the ISO/IEC 9592 standard. Many of the concepts of GKS are present in PHIGS (workstations, input model, attribute handling, etc.). However, PHIGS is primarily a three-dimensional standard aimed at providing high-quality views of graphics objects that are hierarchical and made up of many subparts (e.g. a vehicle). Lighting and rendering extensions together with a number of high-level primitives are included in Part 4 of the standard, called PHIGS PLUS. Part 4 was published some time after the initial three parts. A major revision of PHIGS is in progress (1995).
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