Nurbs曲线/曲面在反求参数上的数值不稳定性,是Nurbs曲线/曲面的致命缺点.该文介绍了用于参

数曲线/曲面求交的活动仿射标架(moving affine frame,简称MAF)方法.基于MAF方法的原理,提出了反求

Nurbs曲线/曲面参数的一种新方法.该方法在数值稳定性和效率上均高于各种传统的迭代法,并已应用于商

品化三维CAD系统GEMS 5.0.

-Nurbs curve/surface parameters in reverse numerical instability, is Nurbs curves/surfaces fatal shortcomings. This paper describes the parameters for the curve/surface intersection of the activities affine frame (moving affine frame, referred to as MAF) method based on the principle of MAF method proposed reverse Nurbs curve/surface parameters of a new method, which in numerical stability and efficiency were higher than all the traditional iterative method, and has been used in commercial three-dimensional CAD system GEMS 5.0.