A Virtual City Square Roaming Navigation System Based On VRML

With the development of virtual reality, virtual ramble has been extensively adopted in many areas,for example,in virtual tourism, virtual real estate, virtual community etc. Through the virtual ramble and Internet, people can visit some place in home there is no time to or not method to. This way greatly expanded the field of vision of people.The research is based on the Yancheng Baolong city square as the background. The research realizes a virtual city square roaming navigation system based on VRML, 3DMAX and Java.Users can use the system to visit the whole square in virtual environment.In the research process, the main achievements are as follows:1. Modeling many three-dimensional models about Baolong city square. According to the different model complexity, different techniques were used. Complex models were modeled by 3DMAX and simple models were modeled by VRML.2. Discussing collision detection in VRML. Collision detection is an important part of realistic experience in virtual reality. Collision detection common methods were discussed firstly, then collision detection technology and optimization method was elaborated in the paper.3、A comprehensive discuss on optimization of the system. First of all, reducing unnecessary line and surface were used to optimize model in the aspect of 3D model optimization; secondly, reducing network data transmission rate methods were adopted to optimize operation of the system, such as: object reuse, prototype, inline node technology, LOD technology etc.4、Discussing various roaming model of virtual reality. Virtual ramble directly determines the user experience effect. This paper mainly discusses the two roaming mode: the automatic roaming and interactive roaming. The characteristics and the method of realization were introduced about two kinds of roaming.