数字化三维服装设计系统中空间曲线造型方法  

The Space Curve Modeling Method in Digital Three-dimensional Garment Design System

作　　者：王银辉[1] 修毅[1] WANG Yin-hui XIU Yi(Computer Center, Beijing Institute of Fashion Technology, Beijing 100029,China)

机构地区：[1]北京服装学院计算机中心,北京100029

出　　处：《北京服装学院学报（自然科学版）》2016年第2期64-70,共7页Journal of Beijing Institute of Fashion Technology：Natural Science Edition

摘　　要：提出了一种空间曲线造型方法,并利用Sharp GL加以实现,获得了满意效果,为系统中的其他操作奠定了基础,对于数字化三维服装设计系统具有重要意义.本方法引进八叉树分层包围盒结构技术,当从拾取点做拾取射线后,首先找到该射线与包围盒相交的特定ID号,然后在包围盒中求取该射线与各个三角面片的交点,并对比各个交点的深度信息,筛选出离视点最近的交点作为拾取点,最后利用Shar GL求值器把各个拾取点绘制成NURBS曲线.该方法兼具了射线测试法精度和包围盒拾取法速度的双重优点.A space curve modelling method implemented with the Sharp GL was proposed in this paper. It runs effectively and smoothly,as the foundation to realize other functions in the system,it holds great significance for digital three-dimensional garment design system. Octreebounding boxtechnique was introduced into this method,the particular ID where bounding box intersected with the pick-up line was found out firstly,and then the cross points between the line and all triangle facets were achieved,the nearest pick-up point was selected by comparing the deep value of these points,and finally the curve through all pick-up pointswas drawn with Sharp GL evaluators. The method has the advantages of both in accuracy and velocity.

关 键 词：数字化三维服装设计 空间造型曲线 八叉树包围盒 点拾取 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]