I'm in the process or creating a tool which will add buildings, obstacles and forests from OpenStreetMaps. I know there is already a tool called OSM2XP existing, but it has a couple of problems and development seems to have stalled on it for the time being. The tool presently supports the following: Multipolygon buildings (buildings with holes) are supported. This makes a big difference in cities.Multipolygon forests and relations are supported. Lots of forests (especially in Europe) are grouped together in OSM into relations, and OSM2XP couldn't find these, which made large areas in Europe where there are forests empty.Complex Rules supported. Example, you can specify that a building with a particular set of tags, and area or height should use a particular facade. This means you can also place obstacles not only based on their tag, but also on their height and other information.If a building has colour information, the tool will generate a facade for it with the exact colour of the wall and roof specified. This all depends on the information in OSM of course, but in some major cities, it's really well done, and people have started to add this information.Resume support, so if you are generating a large scenery area. You can stop the program, try it out, and continue the generation later for other tiles.The program is still in alpha and is currently command-line only, however it's already generating some good scenery. These shots below show a run I did in Berlin: I'm not intending for the program to compete with OSM2XP, as I'm designing it for scenery developers who understand the options and aren't scared of config files and the command-line. Of course, if anyone is willing to create a GUI for it, I'd be happy for the help :-)