How do I put a 3D PDF interactive model into an existing PDF?
PDF3D software has a built-in facility to insert into the current PDF page or append new pages into existing PDF documents without using any external tools. Views with 3D can be placed precisely into existing page layouts. Alternatively, the PDF3DMerge utility can be used to combine pages. In addition PDF3D can output a U3D or PRC file which can be loaded into Adobe Acrobat Pro or LaTeX. Further, there is a template replacement system, where an existing 3D PDF file with a dummy 3D view containing a simple place-holder object can be replaced with an actual 3D model for a final PDF result.