网络环境下道路三维整体建模与简化方法  

Integrated model construction and simplification methods for Web 3D road

作　　者：蒲浩[1,2] 李伟[1,2] 赵海峰[1,2] 

机构地区：[1]中南大学土木工程学院,长沙410075 [2]高速铁路建造技术国家工程实验室,长沙410075

出　　处：《计算机应用》2013年第2期525-529,共5页journal of Computer Applications

基　　金：国家自然科学基金资助项目(50708117);交通运输建设科技项目(20113187851460)

摘　　要：为实现网络环境下道路工程的三维可视化,对其中的关键技术:顾及约束的整体模型构建及模型简化方法进行了研究。基于约束Delaunay三角网构建理论,建立了外形与内部拓扑关系均为整体的道路三维模型。提出了顾及道路约束边界的半边折叠误差度量方法,采用半边折叠操作,在服务器端对道路模型进行整体简化,并建立操作层次树存储操作记录;提出了约束边优先细化,延迟简化的视相关策略,结合视相关重构准则,减少网络可视化所需传输的数据量,在客户端实现了道路三维模型的快速重构。基于上述原理方法开发了相关系统,已在高速公路的网络建设管理中成功应用。In order to realize the Web 3D visualization of road engineering, the key technologies such as the road integrated 3D model construction and simplification methods concerning constraints were studied. Based on the theory of constrained Delaunay triangulation, the road 3D model with integrated appearance and inner topological relationship was created. A half-edge collapse error metric concerning road constrained edges was proposed. Based on it, original road model was integrated and simplified by half-edge collapse and operating hierarchical tree was built to store operation records on the server. The view-dependent strategy was put forward, in which the constrained edges were refined preferentially and simplified afterwards. Combined with the view-dependent reconstruction criterions, the transmission data for 3D visualization was substantially reduced and fast view-dependent reconstruction of the road 3D model was realized on the client. Given the benefits from above methods, a reich/ant system was developed out and applied to many highways Web-based construction management successfully.

关 键 词：道路工程 网络三维可视化 顾及约束 道路整体建模 三维模型简化 误差度量 

分 类 号：TP391.92[自动化与计算机技术—计算机应用技术]