基于CAD数据的3D场景建模及演示技术研究

传统的几何建模方法建模过程复杂，真实感差。提出了一种基于CAD数据的场景建模方法，使用已有的CAD数据构建场景的三维模型和二维电子地图，具有建模速度快而准确的优点；研究了多维信息综合演示系统的开发方法及关键技术，并基于MFC和OpenGVS开发了一个多维信息综合演示系统，实现了二维GIS、三维场景以及音频、视频、图片、文本等多媒体信息的集成，使用户漫游时可以在2D地图及3D场景之间平滑切换，避免漫游时迷失方向。研究成果可应用于城市仿真、奥运场馆等的场景建模及演示。

Research on Modeling and Demo of 3D Scene Based on CAD Data

To create a 3D modeling from scratch is hard and tedious with traditional geometry-based modeling method. A 3D scene modeling method was proposed based on existed CAD data with which 3D model and 2D electronic map of scene can be created quickly and accurately. The method and key technologies for developing interactive multi-dimensional information demo system were introduced and the integration of 2D GIS, 3D scene system and multimedia information were implemented which can make user swift between 2D map and 3D scene and access multimedia information with no loss of orientation when he navigates the scene. A case system was implemented based on MFC and OpenGVS. These methods and techniques can be used for developing large-scale multi-dimensional information demo system for city simulation, Olympic venues simulation etc.