Modeling And Realization Of Structures In 3D Rapid Design Of Urban Rail Transit Lines

In the case of rapid development of rail transit,its planning and design is facing arduous tasks.The existing design is based on the two-dimensional environment,it is not easy to find the potential conflict of various substance in complexity urban environment.It is an urgent task to develop a three-dimensional visual selection line design system,any city can be show in three-dimensions,And achieved rapid planning and design lines in this three-dimensional environment.The core of the three-dimensional visualization system of urban rail transit is to establish a three-dimensional display model for various entities in the urban environment,such as pipeline entities,housing building entities and line structure entities.And the rapid three-dimensional modeling of urban rail transit line buildings become one of the important parts of the 3D display model.Based on this view,"Modeling and Realization of Structures in 3D Rapid Design of Urban Rail Transit Lines" as the theme and modeling Three-dimensional of urban rail transit line structures in this paper.This paper is based on the selected urban rail transit routes.Modeling of circuit structures such as bridges,tunnels,roadbed and so on.Using parametric modeling ideas and boundary representation method,Details are as follows:(1)It can be achieve the accurate positioning of bridge,tunnel and roadbed on urban rail lines.(2)According to the model characteristics of bridges,tunnels and embankments on urban rail lines,the attribute data structure and geometric relations of each structure model are summarized respectively.Lay the foundation for the 3D modeling of the structure.(3)Parametric modeling and interactive re-design of bridges,tunnels,Roadbed and other structures of urban rail lines.(4)To achieve three-dimensional modeling and interactive re-design of urban rail structure in two-line parallel state.(5)This article uses Visual C# as the development platform and the key technology of OpenGL,drawing lines structure,And select the specified roaming path for roaming display.