Research On The Technologies Of Garment Deformation And Collision Detection Based On Torso Features

It is an inevitable trend for GCAD system to convert from 2D to 3D due to 3D computer technology's maturity and the necessity of customized garment. Meantime, to achieve more automatic and competitive GCAD system, it is of great significance to conduct research on the technologies of garment deformation and collision detection based on the original garment model generated from torso model. This thesis displays the outcomes of the author's research on these two technologies after his analysis on the current research status and the remained problems of existed GCAD system.Garment closely ties up with body figure. Hence, corresponding torso model is an indispensable tool during garment design, checkout and evaluation on garment during manufacture process. In chapter 2, feature point of torso model is defined with details on the basis of the pre-process of torso model. In addition, a searching algorithm with changeable step size is presented, which considers searching speed and accuracy. Finally, feature sizes of scanned torso model are acquired according to the locations of feature points. Such sizes, as reliable foundations of garment tailoring, provide accurate and objective standards for fitted, comfortable, slinky and individualized garment design.Generation and deformation technology of original garment acts as a principal part within GCAD system. Started from features of garment and torso model, a garment modification platform, composed of plan form, side view and section view, is constructed in chapter 3. Furthermore, three different deformation technologies are induced. Configuration deformation technology and section deformation technology are both on the basis of editing spline curves but adopt various algorithms to reach the purpose of changing garment figure, while feature size driving technology drives garment to deform through modifying the four sizes- three circumference and lower hem perimeter of garment, and then completes garment's interactive parametric modification.During garment deformation, effective collision detection technology is a powerful sustentation for deformation technology. In chapter 4, the definition, influential factors andcommon methods of collision detection are introduced briefly. And the author proposes resultful collision detection algorithms aiming at the existed 3 collisions in deformation. These algorithms guarantee garment's integrality, continuity and maintainability during deformation.Based on the above research, LookStailorX system frame is introduced in chapter 5. Brief introduction on development environment of this system and detailed description on application of the above research in LookStailorX system are provided as well.Finally, chapter 6 includes a summary of the author's research and the prospects, separately from the perspectives of technology and application, of this project.