You can now create your documents with 3d objects embedded into pdf. How this is possible? You must obtain Adobe Acrobat 3d software product. In Adobe 7.0, Adobe inc. added the ability for you to include 3d geometry. The 3d portions of PDF file are referred to as 3d annotations. You can view the documents with 3d annotations, with the (free) Acrobat 7.0.1 Reader which you can obtain here. More about Adobe Acrobat 3d you can read here.