Adobe's Portable Document Format (PDF) is the standard for sharing graphics. But PDF also supports interactive 3D content. With Adobe Reader you can view the 3D object and spin it around. PDF files with 3D content (or simply "3D PDF files") can be a very powerful way to share shape and graphics... especially for packaging.
Visit www.adobe.com to get Adobe Reader and the browser plug-in for free. You'll need at least version 7.0.8.
When viewing 3D PDF files, there can be some limitations, this depends on your operating system, graphics hardware and Adobe Reader preferences. Here is a quick test to see if you're getting the most out of the 3D viewing experience: