SEOUL NATIONAL UNIVERSITY

Transcription

1 Fashion Technology 2. Concept and Sungmin Kim SEOUL NATIONAL UNIVERSITY Design Process Overview Concept Design Scalable vector graphics Feature-based design Weave CAD 2.5D Mapping Design Process Pattern Design 2D Parametric design 3D pattern design Garment Design Body modeling 3D draping simulation 2

2 Concept Design Style Design Importance One of the most important processes for determining the trend and target market Optimum style design with various materials and trends is necessary 3 Concept Design Style Design Utilization of Design Tools Combinatory Design Design from Scratch Virtual Catalog Texture Mapping 4

3 Concept Design Style Design Benefits of Design Tool Utilization of extensive well-organized style diagram database Maximization of designers creativity through automation style combinations Reduction of time and cost for sample production Required Technology 2D Computer Graphics Vector graphics Raster graphics Hybrid graphics 5 Concept Design Computer Graphics Definition Research field related to the activities that includes graphics as input and output Importance Interactive shape manipulations plays a major role in CAD/CAM/CAE Computer graphics is an essential part of CAD/CAM/CAE software Graphics Programming Device drivers A set of machine dependent codes that directly controls the DPU (Display Processing Unit) Graphics libraries A set of subroutines for specific purposes 6

4 Concept Design Computer Graphics Raster Graphics Pixel (Picture Element) based Bitmap structure Processing time is the same regardless of scene complexity Suitable for detailed expression Scaling or rotation causes quality degradation BMP, GIF, JPG, TIF, PCX,... 7 Concept Design Computer Graphics Vector Graphics Coordinate system based Vector calculus Processing time depends on scene complexity Difficult to express details of an object Non-destructive scaling and rotation DXF, IGES, WMF, AI,... 8

5 Concept Design Computer Graphics Hybrid Graphics Vector graphics for outline Raster graphics for detail Suitable for style design diagrams 9 Concept Design Feature Database Combinatory Design Feature-based design Editable and scalable vector objects Free Shape + Line + Primitive 10

6 Concept Design Applications Job Order Instruction EDI (Electronic Data Interchange) 11 Concept Design Applications Virtual Catalog Real-time interactive combination of various options Provide possible combination scenarios to customers 12

7 Major Functions Automatic Structural Design Basic (plain, twill, satin), extended, and special woven structure database Automatic weavability evaluation and peg plan generation Various design tools Loom Control Function Electronic Dobby/Jacquard loom control function Digital Printing Function Color separation and calibration for optimized digital textile printing Advanced Features 3D visualization of woven structure Photo-realistic visualization of fabric design on garments 13 Principles of Weaving Cloth Beam Warp Beam Warp Weft Shuttle Weft Warp 14

8 15 Three Basic Woven Structures Plain Twill Satin 16

9 Complex Structures Oblique Rib Weave Diaper Twill Checkerboard Satin Fancy Basket Weave Broken Twill Brighton Honey Comb 17 Parametric Structure Design Script language based automation Name=Brighton honey-comb Type=1 Hint=Size must be an odd number Param=1 Size=7 Rule=12 GRID,(Size+1)*2,(Size+1)*2 LINE-45,0,1,(Size+1)*2-1 LINE-45,1,0,(Size+1)*2-1 LINE45,0,Size*2+1,(Size+1)*2 HORZLINE,1,10,1,1,Size,-2 HORZLINE,Size+2,0,1,1,Size-2,-2 HORZLINE,2,(Size+1)*2-1,1,-1,Size-2,-2 HORZLINE,Size+1,(Size+1)*2-1,1,-1,Size,-2 HORZLINE,0,Size,1,1,Size,-2 HORZLINE,Size+2,Size+1,1,1,Size,-2 HORZLINE,0,Size,1,-1,Size,-2 HORZLINE,Size+2,Size+1,1,-1,Size,-2 18

10 Interactive Manipulation Creative design Automatic weavability evaluation 19 2D Visualization Yarn modeling for photo-realistic expression Yarn Modeling Dobby Jacquard 20

11 2D Visualization Color calibration CIE, XYZ, LCh color space conversion DTP (Digital Textile Printing) Swatch 21 3D Visualization Internal structure of fabric 3D Modeling for further analysis FEM (Finite Element Method), Heat Transfer, etc. 22

12 2.5D Mapping Pseudo 3D Mapping Verification of fabric design on actual product Traditional 2D Mapping D Mapping Isoparametric Mapping Definition of multiple regions according to patterns Definition of virtual grid for isoparametric mapping Original Photo Region & Grid Composite Image 24

13 Isoparametric Mapping 1 Texture Image Isoparametric Mapping 0 New Coordinate System (Grid) 1 Simple Mapping Isoparametric Mapping 25 Knit CAD Major Functions Generation of various structures such as tricot, double raschel, and so on. Conversion of garment pattern into knit structure Production planning based on yarn consumption data Warp Knit Weft Knit 26

14 Knit CAD Whole Garment Knitting Ideal seamless garment Whole garment knitting machine (Shima Seiki) 27 Print Design Conventional Printing Optimum color separation Continuous silk screen printing Digital Printing Full color design Environment friendly Low productivity 28

15 Print Design New technology for fast digital textile printing Conventional Silk Screen Printing Single-Pass high speed printing 29