I've searched and never found an answer to this question:
How can I add hyperlinks (URL) associated with different objects in my 3D model, in order to permit clicking and linking from it.
My 3D model has been made in AutoCAD with a URL attached to each object, but Acrobat doesn't seem to keep the info!
No Acrobat and 3D Reviewer do not import the links you created. There are options to recreate them in Acrobat however. Depending upon your intent, you may be able to accomplish your workflow goals by adding links in Acrobat or by using Acrobat or Livecycle Designer Forms tools.
It is hard to offer more without knowing exactly what you are attemping. I hope this at least gets you started.
I am an Adobe Business Development Manager specializing in Manufacturing. I am a vetran of many years in manufacturing and PLM, and focus much of my efforts in 3D PDF and how it can be used to solve numerous customer business problems and challenges.