Exporting from AUTODESK INVENTOR
VTube can import data from Autodesk Inventor.
Autodesk Inventor can export either:
STEP - An international format developed to overcome some of the limitations of current data conversion standards. You can convert files created in other CAD systems to STEP format, and import into Inventor. (versions AP214 and AP203E2)
IGES - For initial graphics exchange specification. An ANSI standard format for digital representation and exchange of information between CAD/CAM systems. (version 5.3)