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A comment on Procedural world generation: C++11 library with highly customizable API. Parent comment
http://wiki.openstreetmap.org/wiki/Simple_3D_buildings
In short, all complex buildings are defined via multiple simple polygons with height, height under ground, colors, etc.
For example, you can check how Saint Basils Cathedral is defined (take a look at Members list):
https://openstreetmap.org/relation/3224486
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http://wiki.openstreetmap.org/wiki/Simple_3D_buildings
In short, all complex buildings are defined via multiple simple polygons with height, height under ground, colors, etc.
For example, you can check how Saint Basils Cathedral is defined (take a look at Members list):
https://openstreetmap.org/relation/3224486