GIS Park

The technique of Web3D has emerged with the development of Internet and Virtual Reality, The aim of web3D is to build virtual world on the Internet. Now, The technology of Web3D has been applied in many fields such as e-business, remote education, engineering, CAD etc. VRML (virtual reality modeling language) is a descriptive language, which has been widely used to deliver interactive 3D objects across the Internet, addition to create static virtual scene. VRML provides several interactive mechanisms to support users to interact with the virtual scene. The pitfall of VRML is that it is only a descriptive language and is lack of programming support. It is a difficult work to build a large-scale virtual scene through complex interactions with VRML.Taking consideration of the characteristics of virtual environment (AE), a framework for VE applications is proposed with the combination of Java3D and VRML, which can effectively make up the shortcomings of conventional solutions. Specific technologies of VRML and Java3D are analyzed in the paper. Some detailed solutions for the realization of VE are presented such as Level Of Details (LOD), getting properties of the objects in the virtual scene by picking mode, etc. Some typical problems concerned with VE are discussed with specific solutions, such as terrain following when navigating in the virtual scene, while other problems are just proposed with solution ideas or even waiting for solutions.Above all of this, the paper analyses the tools of VRML, Java3D etc and structure of virtual entironment, and puts forward corresponding implementing scheme.