City modeling. Using data from a real city (c), a behavioral-geometrical simulator can generate a plausible 3D city model that resembles the actual city (f). Closeups of a dense urban region (a) and a more forestry region (b) can be compared to their quantitatively similar examples (d) and (e). For (d–f), a complete 3D model is actually produced, but seen from an aerial viewpoint in this example (image from [6]).