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Description of BS ISO 8805:1988 2001This International Standard specifies a set of functions for computer graphics programming, the Graphical Kernel System for Three Dimensions (GKS-3D). GKS-3D is a basic graphics system for applications that produce computer generated three dimensional pictures on graphics output devices. It supports operator input and interaction by supplying basic functions for graphical input and picture segmentation. It allows storage and dynamic modification of pictures. A fundamental concept in GKS-3D is the workstation, consisting of a number of input devices and a single output device. Several workstations can be used simultaneously. The application program is allowed to adapt its behaviour at a workstation to make best use of workstation capabilities. This International Standard includes functions for storage on and retrieval from an external graphics file. Also, the functions are organized in upward compatible levels with increasing capabilities. This International Standard provides application programs with the capability to define and display 3D graphical primitives, specified using 3D coordinates. In addition, the GKS-3D input model provides 3D locator and stroke input. The output primitives of this International Standard differ from the output primitives of ISOÂ 7942 in the following ways:
Functions are provided in this International Standard to generate these primitives. The functions of ISO 7942 can be used in this International Standard. However, the output functions generate instances of 3D primitives — instances that are constrained to lie in a plane. Furthermore, additional capabilities are provided in this International Standard to:
This International Standard provides no specific functions for controlling such rendering techniques as light source, shading, texturing, and shadow computations. However, workstations may apply these techniques, locally as the primitives and attributes are realized, provided that the general guidelines of Annex D concerning allowable workstation differences are followed.
GKS-3D defines a language independent nucleus of a graphics system. For integration into a programming language, GKS-3D is embedded in a language dependent layer obeying the particular conventions of that language.
About BSIBSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses. |
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