File menu > Export > IGES (*.IGS)
IGES files are used to import and export objects to and from Autodesk VIZ (and other programs that support this file format). For more information, see Overview of IGES in Autodesk VIZ.
In some cases, when you export Autodesk VIZ objects to an IGES file, the translation doesn't produce exact replicas. To understand what happens to each object when it's translated, review the IGES export table.
When you export IGES files, Autodesk VIZ creates a log file containing detailed information about the processing of the model. The name of the file has the form of filename.xlo. For more information, see IGES Log files.
Note: If there are modifiers applied to surfaces in your scene, it's best to collapse the stack before exporting to IGES. When Autodesk VIZ exports to an IGES file, it skips any surface that has any modifiers applied.