Modeling of irregular structures for the construction simulation in virtual reality environments based on web

Construction simulation via computers before the building is constructed is significant. To provide a modeling system which enables the users to construct models of irregular and complicated structure efficiently, and to share the models among different construction companies and groups via network for the construction simulation, this paper presents a new approach of 3D modeling, which enables quick modeling of irregular and complicated building structures and generating neutral models adapted to VR applications based on Web. The object-oriented analysis and design, and lofting functions for the construction of irregular models are presented in details. A neutral model based on XML, and the interfaces to different virtual reality environment are implemented into the modeling system. A practical application example of the main Olympic Stadium for the year 2008 in China is illustrated.