Group;
Here is a link I found for creating 3D PDF files.
The 3D file format "U3D" is required to embed the 3D models in a PDF document.
http://www.3dif.org/
Sample "steel models" in 3D PDF file format
http://cic.nist.gov/vrml/cis2.html
PS: I'm not so impressed with the new 3D PDF compared to Auodesk's 3D DWF.
The files seem to be very choppy and not as smooth as 3D DWF files.
I haven't tried it out yet and would like to see if you guys have any luck creating them with Revit.
So please upload some samples for the group to see.