NURBS曲面特性分析及重构的方法

The Method for Characteristic Analyzing and Remodeling for NURBS Curved Surface

产品造型中曲面的应用越来越广泛,但曲面的特性分析和修改还相当复杂和烦琐。提出了NURBS曲面的特性分析和重构方法,通过在Rhinoceros中表示曲面模型并提取其型值点和表面网格,再编写Autolisp程序在AutoCAD中提取其特性参数,不需要进行复杂的曲面特性计算即可生成曲面特性数据文件。同时,采用Autolisp程序还可生成基于修改后的数据进行曲面重构的脚本文件,直接在Rhinoceros中运行即可完成曲面的重构。实例表明该方法简单实用,效果良好。

Curved surface is widely used in product modeling. But the characteristic analysis and the modification of the curved surface are rather complicated and tedious. A new method is presented for the characteristic analysis and remodeling of NURBS curved surface. By displaying the curved surface model in Rhinoceros, the points and the meshes on the curved surface could be extracted. Then an Autolisp program was writen and run in AutoCAD to extract the characteristic parameters. The data file of the characteristic parameters of curved surface could be generated without complicated calculations of curved surface features. Meanwhile, the Script File for curved surface remodeling in Rhinoceros operation could be created based on the modified data file using Autolisp program.The example shows that the method presentd is simple in use with satisfactory results.