Basic Theory And Methods Of Urban Rail Line3D Visualization Design

The urban rail transit lines design facing the extremely arduous task, In the backdrop of the rapid development of urban rail transit construction, Due to the urban rail transit lines in the city, the ground buildings and underground structures in complicated cases subject to potential conflicts, traditional2d design intuitively and environment is not easy to find all kinds of potential conflict, low design efficiency, easy to cause a design flaw, has been difficult to meet the needs of urban rail transit lines design work. Therefore, building a3d geographical environment can satisfy the complex environment of rail transit line selection requirements of three-dimensional geographical environment, implementation in the three-dimensional environment for circuit design and decision-making, improve the design efficiency and design quality, reducing conflict into urban rail transit lines need to be addressed in the field of general design research, Based on this idea, this article with "urban rail line3d visual design theory and method" as the theme, about the theoretical methods and key technologies involved in the research, from the aspects of modeling method and the algorithm puts forward a set of methods and implementation. Main research contents and research results are as follows:(1) Implemented rapid and batch extraction method based on Google Earth space data such as terrain data, imaging data, building height of automatic,. Is proposed based on Google Earth and hardware GPU technology rapid3d urban scene modeling methods, meet the requirements of urban rail transit line3d design.(2) Puts forward the arbitrary polygonal cross section along the center line of the pipeline unified modeling method of interpolation extension longitudinal section; make unified underground linear structure modeling and rapid. Algorithm can of circular and non-circular cross section of the tubular solid modeling has good versatility, According to the characteristics of the mass line kind of underground structures.(3) The hybrid modeling based on parametric method and GIS technology, the element model method,3d graphics library modeling method, Implemented the elevated Bridges of urban rail lines, underground tunnels, subgrade, the station quickly, diversity of landscape for the integration of3d modeling method. Algorithm for road, railway, and other lines of3d modeling also has good reference value.(4) Achieved the stratification of the underground water level3d modeling, and based on the GTP element made of integrated modeling method of three-dimensional geological modeling, is established to satisfy design requirements city rail transit line3d ribbon geological model.(5) Based on3-d scene space interactive query technology,3d tracking algorithm, directly on the3d environment generated in the center line of3d model., a real-time three-dimensional space conflict judgment method is established by3d interaction techniques, implementation in the center line of the3d scene directly drag the3d model, to achieve dynamic visual line adjustment and intelligence conflict judgment, establish a set of feasible urban rail transit line3d design method.(6) Urban rail transit is set up based on the proposed method of three-dimensional wiring design prototype system, can more easily develop practical set of remote sensing technology, virtual reality technology, digital geological spatial database technology,-three-dimensional modeling technology, technology such as3d visual design system. Although this research is aimed at urban rail transit line design problem, but the research also can be directly applied in railway, highway3d circuit design, and the application of digital city and digital pipeline.