Here’s another way to make a 3D PDF, this time with all native Autodesk products.

  1. Use Virtual Agent to download Inventor Publisher 2015 trial
  2. Export a view from Revit (or 3dsMax, or AutoCAD, or Navisworks) as FBX that you would like to make into a 3D PDF
  3. Start Inventor Publisher
  4. New file
  5. Select the FBX
  6. Orient the imported FBX in the view and use the Viewcube to Set Current View as Front or Top as appropriate
  7. On the Home Ribbon under Publish, choose Adobe PDF
  8. Select 3D PDF
  9. Save the file

It makes very decent quality 3D PDFs, with good colour representation.

Idea via:
http://forums.autodesk.com/t5/revit-architecture/3d-pdf/td-p/2843148