Simlabcomposer has a 3D PDF version : 99 $ ;)
http://www.simlab-soft.com/3d-products/simlab-composer-compare-editions.aspx

 

http://meshlab.sourceforge.net/

here you can make free pdf 3D but i Believe thet is not so easy :)
Now you can create pdf, like this with 3D objects with just MeshLab and LaTeX.