filename : Web09.pdf entry : toappear conference : Eurographics 2009, Munich, Germany, March 30 - April 3 2009 pages : 481-492 year : 2009 month : title : Interactive Geometric Simulation of 4D Cities subtitle : author : Basil Weber, Pascal Müller, Peter Wonka, Markus Gross booktitle : Computer Graphics Forum (Proceedings of Eurographics 2009) ISSN/ISBN : editor : publisher : The Eurographics Association and Blackwell Publishing 2009 publ.place : Oxford, UK volume : 28 issue : 2 language : english keywords : abstract : We present a simulation system that can simulate a three-dimensional urban model over time. The main novelty of our approach is that we do not rely on land-use simulation on a regular grid, but instead build a complete and inherently geometric simulation that includes exact parcel boundaries, streets of arbitrary orientation, street widths, 3D street geometry, building footprints, and 3D building envelopes. The second novelty is the fast simulation time and user interaction at interactive speed of about 1 second per time step.