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基于参数化设计的三维桥梁模型构建
作者姓名:吴学毅  刘军收  尹 恒
摘    要:参数化设计是几何体建模的重要手段,而桥梁的三维可视化是当今桥梁信 息化的发展趋势。论文针对桥梁外观参数化模型可视化的需要,对几何体参数化建模的原理 和方法进行了深入探讨。结合桥梁结构特点,分析了主要桥梁组件结构(如T 梁、盖梁柱 式墩、轻型桥台等)构件图的几何和拓扑关系,对组件进行了参数化设计,实现组件的三维 建模;并对组件中特殊图元(如圆弧倒角形墩柱、桥台近似锥面护坡)的绘制算法进行详细 研究;根据各组件间空间位置的拓扑关系,利用参数化变量驱动计算各组件空间位置坐标, 进行桥梁的快速拼接。完成的桥梁三维参数化建模以参数为驱动,用户可以对设计结果进行 可视化修改。所实现的三维参数桥梁可视化系统具有模型构建精致,参数化建模彻底、建模 速度快,参数分类清晰,可视化效果好的特点。

关 键 词:桥梁  参数化设计  三维可视化  

3D Bridge Modeling based on Parametric Design
Authors:Wu Xueyi  Liu Junshou  Yin Heng
Abstract:Parameter design is an important means of the geometric modeling, three-dimensional visualization of the bridge is the development trend of today's bridge information technology. In order to satisfy the needs of visualization of the bridge appearance using parametric design method, the principles and methods of the geometry of parametric modeling are deeply discussed. Combining the characteristics of the bridge structure, geometric information and topological information of nine major bridge component structures (such as T beam, beam-column type pier, light abutment, etc.) are analyzed, the parametric design of bridge components is presented in details, the three-dimensional modeling of bridge components is realized; special primitives and components (such as arc inverted angle pier, abutment slope protection) rendering algorithm is studied. According to topological relations based on the spatial location of each component, bridge can be rapid spliced which uses parametric variables to drive calculation of the spatial position coordinates of each component. After completion of the bridge 3D parametric modeling drived by parameters, the user can visualize the design results. The 3D parametric bridge visualization system achieves fined model, thorough parametric, fast , clear classification, and good visual effects.
Keywords:bridge  parametric design  three-dimensional visualization  
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