Hey @Mazama. I’ve wanted to do the same thing. A company by the name of Visual Law did a great presentation on this technology at InterDrone last year, and they were kind enough to share their list of tools, with descriptions of each. They use an application called Megafiers Terrain, which is a plug-in for 3dsMax. That plug-in somehow ties 3dsMax into Google Earth Pro, and the results are spectacular.
Unfortunately, I couldn’t figure out a way to make it work, and even the owner/developer of the Megafiers Terrain plug-in was at a loss. Megafiers Terrain is at http://www.west-racing.com/mf/?page_id=2983. If you can figure out the integration (which I haven’t yet), you’ll get some awesome results.