Export > Include > Geometry > 
Smoothing groups
 
 
 

Activate this option to write the original Smoothing Group information to the FBX file if the information was imported with the Smoothing Groups option in the FBX importer.

This information is temporarily stored as blind data in your Maya scene, since Maya does not directly support Smoothing Groups.

NoteThe Smoothing Groups option is most commonly used when you import geometry data from 3ds Max and you want to preserve the Smoothing Group information for export at a later time. This avoids the need to re-evaluate the Smoothing Groups when you reimport the file in 3ds Max (or other applications that support Smoothing Groups).