Research And Implementation Of Three-D Navigating System Based On Virtual Reality Technology

Virtual Reality is one kind of technology that can produces a highly real simulation environment by using computer algorithm to make users immerse into the virtual environment.In this system, man-machine interfaces are used to accomplish interaction between users and virtual environment.Compared with the traditional planform and computer animation, the immersion,interaction and realtime function of virtual navigating system is unapproachable.So far the virtual reality had been applied to many fields such as military,amusement,manufacture,medicine,geographic information system.The basic conception, radical contents and key technology of the three-D navigating system are introduced in this paper.Research status in domestic and overseas are also discussed.The file structure of three-D model file, the model construction method,data organization and data management are discussed too.The syestem using display tabular technology to accomplish three-D models establishment.After building up the basic models,the paper amplifies on the feedback-affect using the decimation technique and discusses simulation of fireworks and fountain using particulate system, simulation of clouds movement, burning fire and water current using texture transformation and assuming control of information in alpha access.On the basic of studying current algorithms of plant modeling, the paper holds forth an algorithm to simulate trees of special flat projection.A testing three-D navigating system is developed by the author using VC++ and OpenGL,which demonstrates the correctness of using the modeling approach. Additionally, in three-D scene, some function of interactive operation and simulation of natural scene have been realized.At last, the author makes a conclusion of the whole thesis and points out the shortages in the system, some potential research topics in the future are put forward too.