Revit files can be exported to 3D Objects (.obj) in several 3D modeling programs, including 3dsMax. You can also download special utilities, like OBJ Exporter for Revit that are designed exactly for this conversion's purpose.
Convert Autodesk Revit Architecture project to 3D object graphics.
We have found 2 software records in our database eligible for .rvt to .obj file format conversion.
Microsoft Windows software - convert rvt to obj on Windows
A widely-used 3D animation application from Autodesk
Convert from rvt file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned rvt to obj. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A Revit app for object export