Do you know of any automated way for extracting 3D objects in PDFs? My main profession is a dentist and I worked with various 3D and CAD/CAM system. I have intra-oral scanner that would capture 3D-colour model inside your mouth. The sad thing is the entire system is a walled garden. It uses its own 3D format (.dxd) and would only offer STL as an export format, which doesn’t contain any colors information.
I worked around this by first exporting to a 3D PDF file. Then I use Sumatra PDF [1] to MANUALLY extract the 3D model in u3d format.
U3D is a very obsolete format that almost no 3D authoring program can read it. So I have to use (yet another) proprietary software [2] to convert it to a common 3D format like PLY or 3DS or even to WebGL [3].
[1]: https://www.sumatrapdfreader.org/free-pdf-reader.html [2]: http://www.finalmesh.com/ [3]: https://khoadabest.surge.sh