From Tetra 4D:
3D PDF for Revit allows easy sharing and archiving of Autodesk Revit design and construction data with anyone, anywhere with the free Adobe Reader.
Easily create and share interactive 3D documents enabling everyone from clients, to sub-contractors, building owners, and beyond to participate in the building information modelling process (BIM).
Share design information without putting your source model at risk or requiring recipients to download viewer applications.
The free Adobe Reader is installed on 98% of desktops worldwide so it's easy to share all design data in the universal 3D PDF format. With up to 97% smaller files than the original 3D model, you can easily conduct design reviews electronically.
3D PDF for Revit is available in 32bit and 64bit configurations. Please go to www.tetra4d.com/3d-pdf-for-revit for more information.