SWEEP曲面中三种定位标架的分析比较

在基于SWEEP的几何造型中，一个基本的问题是运动路径上活动标架的确定，尤其对于运动路径是空间曲线的情况情形，它直接影响到所生成 S WE EP曲面的形状控制，在其它应用中，也直接影响到运动物体的形状和姿态的调整，到目前为止，已经有几种活动标架的确定方法，但它们对路径曲线的要求和所生成的SWEEP曲面的形状效果是不同的，文中比较了三种不同的活动标架，用实例说明了这些标架之间的差别，并在实用系统中实现。

Comparison of Three Moving Frames for SWEEP Surface

In the SWEEP based geometric modeling, one basic problem is the orientation of local moving frame on the space spine, which directly affect the shape control of the swept surface. Several moving frames have been proposed, and their effects on the swept surface are different. In this paper, comparison of these moving frames is presented and the relationship among them is discussed. Furthermore, examples using these moving frames are illustrated and implemented in a commercial geometric modeling system, their advantages and disadvantages are outlined.