Computer 3D Simulating Of Woven Fabric Appearance By Using OpenGL Technology

The key to developing fabric 3D simulating software is to establish the appropriate fabric structure model and accurately estimate the dimensional structure of yarns in fabric. Most of the present researches which aim at fabric 3D simulation both at home or abroad adopt B-spline to simulate the flexing state of yarn interlacing . This paper employs the polynomial curve fitting to simulate the flexing state of yarns instead of the bowing modality of using straight lines and curves in Peirce model. The method adopted in this paper, which chooses polynomial curve fitting that combines the bowing curvature of yarns, radius of warp and weft, thread-spacing, crimp amplitude to calculate every spot in flexing trace of yarns as well as defining structure through the arrangement of warp and weft, better describes the actual structure of fabric.Aiming at a vivid simulation of fabric apprearance through computer, through the established mathematical model combined with advanced OpenGL graphical function base, VC+ +6.0 developing environment and the illumination model inside OpenGL ascribed to it, this research realizes the 3D simulation of plain weave and twill weave. The established model has graphic defining operations such as translation, rotation, scale etc. and it is able to change illumination effect in some degree as well as instantly manifesting the diverse 3D graphs according to the varying parameters.Through polynomial structure model and OpenGL developing program, the result of this research realizes the 3D simulation of fabric appearance of plain and twill structure ,manifests the interlacing state and weft in fabric, interweave rule of warp and weft and the effect of diverse geometry parameters on the fabric outlook, thus proves the practicality of polynomial curved line fit in simulating the flexing state of yarns and provides a practical mathematical construction model in complex fabric outlook simulation in the future.