Mobile navigation is usually focused on car navigation and works mainly on a street network represented by a line graph. Due to this, route instructions in most systems are based on distances and directions referring to the underlying line graph, which is appropriate for car navigation systems. Pedestrians, as they are not necessarily bound to streets, walkways or other ‘polylines’, might need another set of instructions for suitable navigation and way-finding.
One concept is the integration of landmarks into route instructions, which are visualized using a digital 3D urban model. The use of landmarks leads to a further concept that will be outlined in this paper: procedural façade texturing for 3D urban models. As facades are the most prominent parts of a building from a pedestrian perspective, flexible and adjustable building textures are needed to support intuitive navigation and orientation.
As the 3D model in this case is not only used for photo realistic visualization purposes but in a task-driven scenario, the visualization needs to be adapted and abstracted in order to support the user in solving the navigation task. A basic concept for procedural texturing will be presented and a brief discussion about the scenario specific use will be provided.

Schlüsselwörter: 3D city model, urban environment, pedestrian navigation, procedural textures