Create a 3dpdf from a Autocad 3d model

I have a client that is going to require us to provide them a 3d PDF for review purposes.  I have researched and found a Plug in that I can create this with.  I am using Autocad 2011 but I have been told that it is possible to do this with Autocad 2013 & or 2014.

I have not been able to find any info to that effect.  I would much rather upgrade and not have to purchase the Plug in.

Your help is greatly appreciated!!

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Image may be NSFW.
Clik here to view.