Research & Application Of Garment Generation And Deformation Technique Based On Sketch

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. To achieve more automatic and competitive GCAD system, it is of great significance to conduct research on the key technologies of initial garment generation, deformation and collision detection. A new garment generation and deformation method based on the garment sketch is put forward in this thesis after the analysis on the current research status and the remained problems of existed GCAD system. Meantime, simple and efficient collision detection algorithms are proposed aiming at the existed 3 collisions in deformation.3D body model is the basis for garment sketch extraction. Hence, in chapter 2, several types of real-life model are introduced. These models will be scanned by a 3D scanning system, and described by triangular meshes in the system., The scanned data should be preprocessed before human modeling, including coordinate transformation, recognition of feature points. Human reconstruction is the emphasis of this chapter. An easy way to construct personalized manikin with uniform sizes and regular topology from scanned body data is presented. After reconstruction, the efficiency can be greatly improved in the process of garment generation, deformation and collision detection.Initial garment generation technique acts as a principal part in GCAD system. There is a detailed explanation on the method of garment sketch extraction and adjustment, garment piecewise technique, garment sub-meshes modeling, assembling sub-meshes while parametric changing topology in chapter 3. In addition this chapter also involves the post processing of the initial garment mesh, including garment partial mesh uniform adjustment, garment mesh special treatment based on sketch envelope curve.Research of garment deformation is also the key point of this thesis. In chapter 4, according to the features of garment sketch, a constraint solution including constraint definition, classification and solving rules is given. Based on the constrain solution, four sketch-driven models are summed up through specific examples. On the basis of the sketch-driven models, garment deformation can be achieved in two ways, sketch editing and feature size driving technique. During garment deformation, effective collision detection technique is a powerful sustentation for deformation technique. Simple and efficient collision detection algorithms are proposed aiming at the existed 3 collisions in garment 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 technique and application, of this project.