Procedural Content Graphs for Urban Modeling

Figure 2

Window example modeled using a CGA shape grammar formulation (upper left; loosely based on [3] and [38]) and our procedural content graphs (lower left), each rule operation corresponding to a node with a matching number. The visual nature of our approach makes the flow of data easier to follow and does not require the user to come up with rule symbols (highlighted in blue) or geometric labels [6, 7], which generally make management difficult and error-prone.