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Initial Graphics Exchange Specification is an American standard started by the American National Standards Institute back to 1979. The Current version is IGES 5.3. The next version will be IGES 6.0.

The file will be made of lines of 80 characters long like a FORTRAN or COBOL file. The file will be divided in sections. Entities are classified by entity number like 102, 402 etc.. The standard has been extended to allow transfer of nurbs and restricted patches.

IGES at CADCAMCenter

HowToIGES

table of entity of IGES

the global section of an IGES file

The official IGES Site

IGES Site

IGES In-work Items

IGES Workshop-Tools

Others IGES Resources

IGESWorks is an IGES viewer. The site also contains useful information about this standard.

IGES at the NASA Some tips about using IGES with various Vendors (As they say "IGES is not an exact science") .

IGES Test Page reference some IGES Viewers and offers an online IGES test file.

The IGES 5.x Preservation Society (IPS) This non-profit organization maintains an archive about IGES where various draft can be found like  1992-01-26 IGES 5 draft means that the link you will follow is external to this site.