@dusoft We experimented with real world maps in a project I worked on back in 2019. It actually worked pretty well, but needed some work, and our whimsical project manager turned his attention to something else.
@dusoft I wouldn't exactly call it "easy". It's doable, but on'es mileage may vary a lot. For the two projects where this was relevant, we had to redo the actual 3D models. The layout data was useful, though.
@jzillw I am sure it might require some edits, but it's easy to generate world objects (roads, train tracks, buildings, parks) from the existing maps and build upon that. I think that saves lots of work when creating environments.