I cannot speak directly for the author, I only can speak as to how I would do it. First off I would make sure that the modeling program, whether it be 3ds max, SketchUp, Revit, or anything else, calls out the edges as hard edges. Since Lumion would try to smooth out any edges called out as smooth. Then it's only a matter of proper lighting technique in where you place the lights and how strong they are to highlight certain edges whereas some are more in shadow, this is the same technique in any program
I am Sorry, I don't often read this website, and my English is not very good.
