服装数字科技DigitalFashionTechnology (4).pdf

Digital Fashion TechnologyThe Principles of Realizing Virtual ClothingVirtual Clothing 1What is Virtual Clothing?What2Why study Virtual Clothing？Why3How to realize Virtual Clothing？HowHow to realize Virtual Clothing？ArtNatural ScienceApparel EngineeringFashion DesignVirtual RealityTextile MaterialsMechanicsComputer GraphicsVirtual ClothingThe Simulation of the Deformation Effect of Fabrics of Regular Shapes.How to realize Virtual Clothing？Physics-based Fabric SimulationMass-spring modelThe Process of Physics-based Fabric Simulation1.Establish the Mass-spring modelNumber of mass points10*10=100It is assumed that the mass of all mass points is the same.1010Three kinds of springs that connect different mass points 1.Structural Spring 2.Shear Spring 3.Bend Spring)(0llkFss=Hooke law cloth2Two Storage Variablescloth1(0 to 9,0 to 9)/Record the motion state of all mass points at thetimomentcloth2(0 to 9,0 to 9)/Record the motion state of all mass points at theti+1momentcloth12.Conduct the force analysis and list differential equation),(int),(tXFtXextFFmaF+=Newton second lawGravityAir resistanceElastic forceDamping forceTo solve theacloth1The differential equation of motion of mass points mFdtdvdtXdavdtdX=221st order ODE2ndorder ODEamFdtXd=22Aim:To solve the velocity vi+1 and space position Xi+1of a particle at the next moment.3.Solve the equationvi+1v(ti+1)解析解数值解mFa=havviii+=+1hvXXiii+=+1Euler4.Update each point status and displaycloth1ti copy all the values of cloth2 to cloth1 /redraw cloth1 /calculate vi+2and xi+2 for cloth2 /keep doing all this forever /cloth2ti+1Virtual stitching of a four-piece skew skirt Identify sutures and reference pointsSet the section ID and side IDThe sewing process of virtual clothingResearch results Digital Display System of Tibetan Clothing(BIFT)Mens Tibetan robe with blue geometric patternPulu Tibetan robr for menTianhua Brocade Tibetan official robeSources:Chen Guo,PhD candidate,Ma Fenfen,MASTER candidate,Beijing Institute of Fashion TechnologyResearch resultsMens Tibetan Robe with blue geometric pattern(Real object)Mens Tibetan Robe with blue geometric pattern(Virtual clothing)Mens Tibetan Robe with blue geometric pattern(Human fitting)Research resultsPulu Tibetan Robe for men(Real object)Pulu Tibetan Robe for men(Virtual clothing)Research resultsPulu Tibetan Robe for men(Human fitting)Research resultsHow to realize Virtual Clothing?Build a mass-spring model01Calculate according to numerical integral method03Conduct a force analysisaccording to Newtons second law02Display the result of calculation dynamically in a graphical way04SummaryThanks