Trimming Sweep Surfaces

The trimming of sweep surfaces,referring to the estimation of points ostensibly on the boundaries that actually lie in the sweep surface interior,is an important problem for geometric modeling.Inspired by the trimming techniques developed for offset surface,efficient methods for both local and global trimming of sweep surfaces are proposed in this paper.The methods can also be used to compute the intersection between a freeform surface and a general sweep surface,or between offset of sweep surfaces.The efficiency and advantages are verified by examples obtained by geometric modeling software PUM 2.0developed by Peking University.