No one has created the FBX importer that I requested for Revit, but hey, maybe one day.  In the meantime, here are some other importer / exporters of interest…

Read the whole past:
The Building Coder: Graphics Pipeline Custom Exporter

Quote:
“Philippe Leefsma recently presented an online 3D WebGL viewer for both mobile and desktop devices implemented using JavaScript, WebGL and the threejs library.
It displays graphics stored in the same custom JSON format that Philippe already defined for his initial cloud based viewer and for which Adam Nagy in turn implemented a Revit 2013 exporter.
I would love to create a Revit exporter for this format based on the new custom exporter API, for fun and comparison.”