IGES (.ige .igs .iges)

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IGES – two-dimensional / three-dimensional vector graphics format; used by many CAD programs.

First published in January 1980 by the National Institute of Standards and Technology (USA), code NBSIR 80-1978. Many documents (for example, early versions of the MIL-PRF-28000 and MIL-STD-1840  Protection Standards) refer to it as ASME (American Society of Mechanical Engineers) Y14.26M, designation of the American National Standards Institute, approved IGES version 1.0.

With the help of IGES, in CAD, it is possible to transfer models of pie charts, model frameworks, surfaces of any shape or representation of solid models. Applications that support IGES include engineering graphics, analytical models and other production functions.

The GES file consists of 80-character ASCII records (the length of the record originated from the era of punched cards). Text lines are presented in “Hollerith” format – the number of characters in a line, plus the letter “H” and the line itself. An example is “4HSLOT” (a similar format of text strings was in Fortran). Early IGES translators had problems with IBM computers using EBCDIC text encoding, so some EBCDIC-ASCII translators replaced characters incorrectly or incorrectly set the parity bit, causing reading problems. Consider a very short 1987 IGES file that includes only entities of a pair of points (POINT, type 116), a pair of semi-circles (CIRCULAR ARC, type 100) and two lines (LINE, type 110).