| In the Virtual Environment Railway Location System, the modeling of the railway structure is one of the important taches in the 3D Location Design, so research the modeling methods of the structure and construct and manage the models have very important meaning. This paper start from the decision-making of choose the type of the structure in the Virtual Environment Railway Location System and the requirement of the 3D design, researches and discusses the key technologies and academic methods about upbulid the railway structure 3D model base, defines the concept of the railway structure 3D model base . On the basis of upbuild the system configuration for the model base, this paper use AutoCAD, 3ds max and Oracle to combine, research a fram of the railway structure 3D model base. Through construct the model embryos for mass blocks, bridges and tunnels to upbuild a basic railway structure 3D model base. Combining with the applied request of Virtual Environment Railway Location System, the technique of inquiring, reappearing and using of the railway structure 3D model base is researched. To verify the theories method put forward in the model database and text build up, Visual C++6.0 is used as the system development terrace, developing this system as well as OpenGL, and combining together with Oracle 9i used as the data management tool, the railway structure 3D model base management system is set up. The system application enunciate that the railway structure 3D model base management system is reasonable, inquired fast and convenient; the technique of inquiring and applying of the model structure system put forward in this text is feasible and effective.The production of this paper shows that through construct model base to manage the railway structure 3D models can availably help engineers do the decision-making of choose the type of the structure in the Virtual Environment Railway Location System, improved the efficiency of the Railway 3D Real Time Location Design. |
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