IGES

Menu: Files->Import->IGES...

With this option it is possible to import a file in IGES format (version 5.3)

There are two alternative implementations (can be selected in the import options of the file selection window)

Classic: inhouse parsing of IGES 5.3 specification, without third part libraries

OpenCascade: based on Open CASCADE Technology (OCCT) library that not only do the parsing, also build a CAD geometry with OCCT data structure.

Current default is Classic

The variable ImportTolerance (see Preferences ) controls the creation of new points when an IGES file is read. Points are therefore defined as unique if they lie further away than this tolerance distance from another already defined point. Curves are considered identical if they have the same points at their extremes and the "mean proportional distance" between them is smaller than the tolerance. Surfaces can also be collapsed.
Entities that are read in and transformed are not necessarily identical to the original entity. For example, surfaces may be transformed into planes, Coons or NURBS surfaces defining their contours and shape.