Use OBJ Export to export your
Revit model to an OBJ file.
Open a 3D view.
Note: The exported geometry will be based on the current view. Geometry exported will reflect the visibility and graphics settings of the current view.
Click the File tab
Export
CAD Formats OBJ.
In the OBJ Export dialog , specify your OBJ file settings.
Click Save to create the OBJ file or click Cancel to close OBJ Export dialog.