Open Autodesk® Navisworks or Autodesk® Revit®, go to Addins and run the 'Export to Sketchbox' command.

Install or uninstall the Sketchbox VR Integration according to standard procedures.

Download the app from the Autodesk App store.

Double click the file to start the installation process.

Follow the instructions on your screen. 

To uninstall this plug-in, you can run the installer again, or click Control Panel > Programs > Programs and Features (Windows 7/8/8.1) and uninstall as you would any other application from your system

While the tool generated is a standard glTF file, it is aimed at Sketchbox3D and there is no guarantee that models will open correctly in other viewers. Please use Sketchbox AR/VR to view the apps.

Navisworks can have corrupted meshes that look fine using double side rendering (backface culling), but that will not render well in glTF / Sketchbox.