Three-dimensional Modeling And Realization Of Geomorphology And Geological Body In 3D Rapid Design Of Urban Rail Transit Line

At present,the traditional method of line design is based on the two-dimensional environment,has been unable to meet the basic needs of urban rail transit design work.Therefore,it is very important to establish a three-dimensional visual line selection environment which can meet both the needs of the city landscape and the needs of the underground scene.This paper aims at three-dimensional modeling of geomorphology and geological body in three-dimensional rapid design of urban rail transit,and the theoretical methods,key technologies and algorithms are studied deeply.The concrete research contents are as follows:(1)By comparing several common three-dimensional visualization techniques,OpenGL is selected as the 3D visualization technology and C# as the development tool to provide the development environment foundation for realizing the 3D rapid modeling of geomorphology and geological body.(2)In the three-dimensional rapid modeling of urban landscape,the park model based on the triangulation algorithm of arbitrary polygon.The building model based on the wall of the building and the top modeling method.The road and river model based on the modeling method of straight section,curved section and intersection section of road and river.(3)In the three-dimensional rapid modeling of underground scene,the generalized triangular prism is selected as the basic body element,according to the drilling data structure,the geological model is established by means of 3D geological modeling method.Based on the algorithm of two intersecting triangles,the geological profile along the line,the tunnel and the geological cutting model are generated.The underground pipeline model based on the modeling method of straight section,junction section and pipe section around the junction of underground pipeline.(4)The basic data is taken as an example in the vicinity of Zhongshan East Road,Shijiazhuang,the modeling of the whole 3D scene in the three-dimensional rapid design of urban rail transit line is carried out,and the feasibility of 3D modeling method of geomorphology and geological body in the system is verified.