Nowadays there are many of us who make 3D models. In many cases they are very heavy models that are currently unfeasible to insert in a PDF. However, there are visualization tools that allow to lighten the geometry of the object without losing quality in the visualization. This is done by loading textures such as normal, roughness, etc. that currently cannot be loaded into the PDF. If they could be implemented, in my opinion it would give a good boost to the use of PDF, both for publications and for sending files. It would be very interesting to implement them in the Adobe Acrobat program.