Several Problem Researches On Dynamic Simulation Of Cloth And Digital Garment Model

Clothing and garment design is an important weapon in the competitive market of theclothing filed. The traditional clothing design has the disadvantage of the high cost, the longperiod and the resource waste. The3D garment CAD has changed the way of designing fromcolor and style collocation realized by mapping of texture into showing the materialcharacteristic of clothing and three dimensional display of fitting result. Furthermore, it canrealize the matching of clothing size and fabric comfort. The design and display of garment isbecoming more and more individualistic and intuitive. The dynamic simulation of cloth anddigital garment model could represent the physical properties of cloth and improve the fittingeffect on the human body. It is an essential component in garment CAD. The dynamic simulationof cloth and digital garment model has important significance and application value.This thesis uses physical model in cloth and fabric simulation to show the animation ofcloth under the wind and collided with some solid objects. At last, it displays the fitting resultthrough the garment stitching on the human body. The paper is organized as follow:(1) It gives the comprehensive analysis of the research status about the cloth animation and3D digital garment simulation, and points out important significance in research and broadapplication prospects.(2) It uses the mass spring model which is based on physical method to simulate cloth. Theinitial number of particles is an important factor that affects the speed of simulation. In order toimprove the efficiency and result of cloth simulation, we present a method based on adaptivesubdivision of meshes. The method subdivides the meshes which belong to the colliding particle,and uses the structure of quadtree to store and manipulate the particles. We also use the structureof grid to traverse the system for calculating the spring force. It deletes the edge structure whichsaves the cost of the system. (3) The digital garment model is generated by picking the grid point interactively andmerging two2D meshes of cloth into a3D mesh of clothing model. The grid of cloth will collidewith the human model during the garment stitching. Collision detection and response costinfluence the simulation time. We present a new method based on the ellipsoid bounding boxesin multi-resolution to replace the human model during the collision detection. First, we use themethod of octree to subdivide the minimum voxel which includes the human model. Aftersubdivision, we generate the smallest external surrounded ball to each voxel. Finally, throughcontinuous merging balls and ellipsoids, we get the set of ellipsoid bounding box in differentlevel of detail, which can realize the fast collision detection between the garment and the humanbody.(4) This chapter describes the main structure of the dynamic simulation system and theinterface functions. The system is realized by C++and OpenGL.In the end of this thesis, it summarizes the current work and gives the prospects of thisresearch.