中文摘要：

针对车身曲面难以用单张曲面进行表达的情况,提出用光滑拼接多张带形状参数的双三次Q-Bézier曲面技术构造曲面方法,并用多张双三次Q-Bézier曲面拼接描述汽车车身曲面;提出由设计师构建多个单张双三次Q-Bézier曲面,再进行曲面间的光滑拼接,在编辑各组双三次Q-Bézier曲面公共边界的位置及其各形状参数的情况下,得到大量的车身造型方案。该方法基于双三次Q-Bézier曲面的生成及其拼接原理,可以高效调整车身曲面及其公共边界,获得光滑的曲面连接效果,从而快速获得多种汽车车身造型方案。所提方法运算速度快、易于操作,具有良好的可拓展性。

英文摘要：

In engineering,the complex car body surfaces cannot be described by using one single surface; thus the continuity conditions of the cubic Q-Bézier surfaces with multiple shape parameters were investigated. A car body design method based on cubic Q-Bézier surfaces with multiple shape parameters is proposed in this paper,which describes the car body that has a group of cubic Q-Bézier surfaces with multiple shape parameters in the design process. The group of cubic Q-Bézier surfaces are created and blended continuously; the surfaces＇ boundary position and shape parameters were modified efficiently,thus obtaining the new car body design solutions. This design method,based on the principle of cubic Q-Bézier surfaces that generates and blends multiple shape parameters,can quickly edit the surfaces by adjusting the boundary curve and obtain many design solutions,being widely applied to modern industrial design.