Developing A Software Of Fabric's Appearance Simulation On Basis Of Real Yarn

The best selling of textiles depends to a large extent on the design of textiles thatis able to satisfy the customers' psychology in terms of both esthetics and quality. Nowdays, the period for the substitution of new products for old ones is getting increasingly shorter, which in turn demands that the period for the research and development of new products should also be shortened. Hence it is of vital importance for textiles dealers to establish a quick-response system capable of meeting the requirements from market as well as improving their design efficiency.Conventional design is characteristic of low efficiency. The application of CAD system release the conflict to a certain degree. But there is a great difference between the fabric simulated from the present CAD system and the true fabric. In this paper, we study how to develop a computer aided design system for fabric appearance simulation on the basis of data obtained from CCD optical system. This CAD system is based on establishing fabric appearance simulation model in the computer and fabric structure model, studying the fabric structure's impact on fabric appearance simulation, establishing a light model used for the gray treatment and treating with yarn's twist.The main content of the paper includes:(1) Establishing a model of warp and weft unit imagination on the basis of the analysis of the position of warp and weft in the fabric;(2) Making a study of the math model which makes the fabric structure design of plain, twill(1/2, 2/2), stain(5/3) come true in the computer;(3) Studying the influence of fabric geometry structure on fabric simulation and choosing a better model for the CAD system;(4) Establishing a suitable light model used for the gray treatment with fabric which makes the fabric exhibit a third dimension;(5) Establishing a twist treatment model capable of making the yarns in the image have a sense of true, so as to get a better fabric appearance simulation;(6) Developing the concerning VC++6.0.This paper draws some conclusions as follows through hard work:(1) The model of warp and weft unit imagination ,which is established through analysis of the position of warp and weft in the fabric, prove to be effective. It solves the most basic problem and provides a basis for fabric appearance simulation.(2) Math model for the fabric structure design of plain, twill(1/2, 2/2), stain(5/3) can reflect correctly related fabric structure in the computer(3) Better effects can be obtained by applying the predigest circular Cross-section geometry of fabrics to those whose warp and weft density is not very high(<70 piece/cm)(4)The simulated image has a realistic third dimension after the gray treatment using light model that can simulate the real vision condition.(5)The twist treatment model can show the twist effect in the yarns of the fabric and thereby providing a better fabric appearance image(6)The application of the software indicates its good practicability after being debuggedIn one word , this system for fabric appearance simulation has a good outcome for common fabrics.A more through study of the geometry structure, however, has not yet been conducted due to the limited time, thus making it difficult for the system to simulate fabrics with higher density and accordingly producing a necessity of further research on this issue in the future.