In the engineering world outside software, our cad tools generate rich interactive functionality into PDFs, including but not limited to 3d models for those doing mechanical work.
I've known about those capabilities for a long time and I've always wondered: How commonly is that used? For what use case(s)? What makes PDF the format of choice for that purpose and not, for example, a CAD file? What PDF apps are popular for creating and using those files?
