Abstract
Although scene simulation with computer graphics has been done at the planning stage of buildings and cities, no system has been reported which performs interactive simulation. We developed a system for the design and modification and simulation of city planning with real-time interaction. By this system, we can comparatively evaluate several plans, since attributes of objects in the scene can be changed quickly with GUI-based operations. A scene database is designed to handle enormous scene data efficiently and is put at the core of the system. Comfortable scene evaluation is realized in the experience (simulation) system by viewing the scene from arbitrary viewpoints as if in a virtual train, car, plane or as a walker.