【摘要】 该文介绍了双参数控制的双Ｂｅｔａ样条曲面的算法原理、边界条件处理、投影变换，以此为基础设计了自由曲面造型系统（ＦＳＭＳ），并用ＦＳＭＳ开发的实例做了验证分析。更多还原

【Abstract】 This paper introduces the theory of algorithm of Bibeta spline surface controlled by double parameters,the method of processing boundary condition,the transformation of projection,and the design of system con atruction.The FSMS(Freedom Surface Modelling System)has been realized.The author has also given appliantion examples.更多还原