Why are Revit objects hidden or missing?
 
 
 

In Revit, you can “hide” and “temporarily hide” elements. The 3ds Max FBX Plug-in imports “temporarily hidden” objects exported from Revit. Although they exist, these elements are not visible in 3ds Max, since they are “hidden”.

“Hidden” elements in Revit do not export and do not exist when you import your FBX into 3ds Max.