铁路线路设计中三维实时交互式仿真研究  

Study on 3D Real-time Interactive Simulation of Railway Alignment Design

作　　者：蒲浩[1] 宋占峰[1] 詹振炎[1] 

机构地区：[1]中南大学土建学院

出　　处：《中国铁道科学》2003年第5期56-60,共5页China Railway Science

基　　金：铁道部科技发展计划基金项目(97G23 F)

摘　　要：基于分割—归并思想将线路三维实体分为现状景物实体和虚拟景物实体,分别研究各子实体的三维造型方法,并应用约束Delaunay三角化理论研制拼合算法,实现将各子实体快速拼合成三维整体模型。在此基础上,提出并实现铁路线路三维模型的视相关简化算法,该算法首先应用累进网格技术构建出网格顶点的层次结构,然后依据视锥截取,背面剔除和屏幕投影误差三个视相关简化准则,从层次结构中实时计算出当前视相关简化网格,最后应用真实感图形绘制技术实现铁路线路三维场景的实时交互式仿真。实践证明,该技术可实时生成具有高度真实感的铁路线路三维场景并可通过鼠标或键盘操控浏览路径,从而实现设计成果与设计过程的可视化。According to the thought of dividing and converging, the railway alignment 3D design is divided into the actual scene and virtual scene first. Then the 3D modeling method of each subentity is worked out respectively. Then use the constrained Delaunay triangulation theory to develop the converging algorithm, thus we can quickly assemble the various subentities into a whole 3D model. Based on the 3D model, the paper puts forward and realizes the video related simplification algorithm of the 3D railway alignment model. The algorithm first uses the technology of progressive mesh to create a hierarchy structure of mesh vertex. Then, it extracts the current viewdependent meshes realtime from the hierarchy according to such three viewdependent simplification criteria as viewfrustum culling, backface culling and screenspace projection error threshold. Finally, the realtime interactive simulation of railway route 3D scene is realized with the technology of realimage mapping. Practice proves that the whole technology stated in this paper could not only create highly realtime railway route 3D scene but also control the browsing path with a mouse or keyboard. So the visualization of both design progress and the design result is realized.

关 键 词：线路设计 三维可视化 实时显示 三维建模 仿真 

分 类 号：U212.3[交通运输工程—道路与铁道工程]