The Design And Implementation Of Highway Real-time3D Visualization Landscape Design System

Domestic highway CAD system mostly used the traditional highway design method, thatis, through steps of the plane design, profile design and cross section design to expresshighway position in three dimensional space,complete the integral design of the route.Thismethod with complex problems simplified by steps can make the designer master the index ofthe plane and profile design, but can’t really express road3D status, can’t obtain thecoordination information of the path with the environment, also can’t evaluate the way oflinear design index and road safety conditions. This kind of traditional design already can notadapt to continuous improvement of highway on landscape, linear, safety and environmentaldesign requirements. Along with the development of the design theory and method, using thevirtual reality technology of highway design results for3D visualization have been appliedmore and more, research and development highway real-time3D visual design system hasbecome research hot spot and CAD highway development direction.Based on studying the theory of Digital elevation model (DEM) modeling theory,Triangulated Irregular Network (TIN) triangle structure nets theory and so on, this paperexpounds the design of the whole system and the detailed design, outlines the3D visualmodeling method. System base on the aerial terrain data and the route design data withsoftware of Iroad, realize establishing the3D modeling road project with the real landscape,adopt parametric design and model method to establish the terrain, road, bridges, tunnels androad affiliated facilities models, this paper discusses the modeling method and process of theterrain, roads, tunnels, Bridges, traffic facilities and various scenery model, and discusses howto use digital elevation model to establish terrain model, for big range of complex terrain,when data is large, we introduce simplified technology. Through the establishment of thetexture library, can shine texture image upon the model, so as to realize the highway3Dvisualization landscape design.Combining subject research goal, The writer’s laboratory developed highway real-time3D visualization landscape design system, demonstrated the highway3D visual modelingmethod systematically, realized to build the3D terrain model rapidly, to link the terrain modelwith the road model seamlessly and realized the entire road3D scene visualization. The successful development of the system to enable the designer can experience to feel the designscheme of the quality and the reasonable, can really reflect the road design results. Thepractical application shows that the modeling method and theory expounds in this paper of thesystem is valid and feasible.