顾及高效可视化的 CAD模型数据重组织方法 *

CAD模型造型精度高 ,渲染效果逼真 ,被广泛应用于虚拟现实、实时仿真以及三维地理信息系统等三维可视化中 ,但是其几何模型数据复杂 ,图像数据量大 ,也导致可视化效率低下。为此 ,提出了一种 CAD模型数据重组织方法 ,旨在解决当前可视化应用集成 CAD模型数据效率低下的问题。采用预先计算可视化信息 ,高度紧凑组织数据 ,顾及图形软硬件特性等一系列策略 ,实现 CAD模型数据的高效可视化功能。其中 ,几何模型绘制和图像纹理生成效率均提高了 10倍以上。该方法被成功应用于香港志莲净苑佛寺虚拟旅游演示项目中。

New method to reorganize CAD model concerning visualization

This paper presented a new method to reorganize CAD model data, which aimed at solving the problems of visuali-zing CAD model data inefficiently. The accuracy of CAD model data might be very high, and rendering effects could be realis-tic, so it was broadly applied to virtual reality, real-time simulation and 3D geographical information system and so on. However, goemetric data of CAD was highly complex and image data was very large, which leaded to low-efficiency of visua-lization. In order to solve this problem, this paper used a series of strategies. For example, beforehand calculated visualization information, and high-tightly organized data, and concerned graphic hardwares and softwares. Because of these solutions, the efficiency of rendering geometric model and generating the texture was improved over 10 times. Furthermore, this technique was successfully applied to a virtual-touring system in Hong Kong.