Well, I use an autodesk product called Maya to create 3d models for games. Then I sell those assets to companies etc. Currently making about 500 bucks a fortnight off of just that. But Autodesk do make other programs such as revit, CAD, etc.
I dabbled in 3D but mostly from a design and technology perspective such as making a squat rack with autodesk inventor so I knew how to make it and what materials.
I very often lose staff members when I talk math for the system...