When Acrobat X was released, most of the powerful 3D functionality of Acrobat was removed and placed into 3rd party tools.
However, you can still download trial versions of Acrobat 8 and Acrobat 9 that include the enhanced 3D functionality. Links are provided below:
Adobe Acrobat 3D Version 8 (includes Adobe Acrobat 3D Toolkit)
http://te.hu/download/adobe/demo/acrobat/acro3D80_efg.zip
Adobe Acrobat 9 Pro Extended
http://www.adobe.com/cfusion/tdrc/index.cfm?product=acrobat%5Fpro%5Fextended
You may be interested in my previous posts:
Create Adobe 3D PDF directly from Autodesk 3D DWF
Create 3D PDF files from Autodesk Revit for free
