If you are working with object heavy CAD models you probably know that often 90% of the objects are hidden internal components of the rig. Stuff you usually don't need or want. Object count that make 3dsMax crawl.
This script creates a dome of cameras. Place it around your 3D Scene and let it render. It will store all visible objects for you when done. You can save selected, inverse selection and delete or do whatever you want with it. It's not a fast solution on heavy scenes, but should be way faster than any manual attempt.