Free-form deformation of solid geometric models-英文文献.pdfVIP

Dallas, August 18-22 Volume 20, Number 4, 1986 F r e e - F o r m D e f o r m a t i o n of Solid G e o m e t r i c M o d e l s Thomas W. Sederberg Scott R. Parry t Brigham Young University Provo, Utah 84602 ABSTRACT toroidal. Recently, the capability of defining fillets and blended surfaces has also been introduced [Hoffmann 85t, A technique is presented for deforming solid [Middleditch 85], {Rockwood 86]. geometric models in a free-form manner. The technique can be used with any solid modeling system, such as CSG The problem of defining a solid geometric model of or B-rep. It can deform surface primitives of any type or an object bounded by free-form surfaces has long been degree: planes, quadrics, parametric surface patches, or identified as an important research problem. Most of the implicitly defined surfaces, for example. The deformation approaches to this problem can be classified into one of can be applied either globally or locally. Local deforma- three categories: tions can be imposed with any desired degree of deriva- tive continuity.