道路三维场景的实时动态显示技术

基金项目:

湖南省科委基金项目 01-961-18-4

Real-time dynamic display technology of road 3D scene

1.
Department of Civil and Architectural Engineering, Central South University, Changsha 410075, China
2.
National Key Lab of Information Engineering for Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China

摘要: 实时动态显示技术是实现道路三维可视化设计的关键, 应用Delaunay三角化算法构建数字地面模型, 基于分割-归并思想完成道路三维实体造型, 在此基础上, 提出并实现了有效的道路三维模型的视相关简化算法, 并结合真实感图形绘制技术开发了道路三维场景的实时动态浏览平台, 将该平台与路线CAD系统集成, 实现了道路设计过程和设计成果的可视化
- 三维可视化 /
- 道路设计 /
- 实时显示 /
- 三维建模 /
- 模型简化 /
- 细节层次
Abstract: The technology of real-time dynamic display is the key technology to realize road 3D visual design. This paper applied the creating algorithm of Delaunay triangulation to constructing digital terrain model and accomplished 3D modeling of road entities according to the ideal of divide and conquer. An effective view-dependent simplification algorithm for road 3D model was worked out. Benefit from the algorithm being combined with the technology of showing realistic image, the real-time dynamic browsing platform of road 3D scene was explored. The 3D browser was integrated with the system of road CAD, which realized the visualizations of both design course and design fruits.
- D visual design /
- road design /
- real-time display /
- 3D modeling /
- simplification of model /
- level of detail

图 1 路线三维实体造型的分割-归并思想

Figure 1. The ideal of divide and conquer in route 3D entity modeling

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图 2 边折叠和点分裂

Figure 2. Edge collapse and vertex split

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图 3 渐进网格的层次结构

Figure 3. The hierarchy of progressive meshes

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图 4 背离面和屏幕投影简化

Figure 4. Simplification according to back-face culling and screen-space projection error threshold

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图 5 地形视相关LoD网格

Figure 5. Terrain view-dependent LoD meshes

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图 6 道路视相关简化模型

Figure 6. Road view-dependent simplification meshes

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图 7 公(铁)路实时动态浏览

Figure 7. Real-time dynamic browsing of highway and railway

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图 8 三维浏览器与路线CAD系统集成的设计平台

Figure 8. Design platform combined 3D browser with route CAD system

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