R&D Of Dobby CAD System

Dobby fabric is used to design textile products in wool textile factory, color woven fabric factory and shirt factory widely.The R&D of Dobby CAD that aimed at Dobby fabric reduced the workload greatly, shortened the design cycle and improved the competition of the product in the market.Dobby CAD system is make up of three modules those are tissue design module, yarn design module and textile simulation.Tissue design module can realize the function of tissue integration and tissue disintegration, Tissue integration can obtain many kinds of tissue pattern because of the different method of pulling on heddle. The tissue pattern can also change into relevant heddle pattern and weaving pattern through tissue disintegration. Tissue design has the function of the copy and extend of base tissue as well.The design of yarn is a rather important tache, it can easy get the yarn's math model according to its geometrical structure, the paper has bright forward a quick illumination-rendering method that based on HSL/RGB, the advantage of this rendering method is its speediness compared with the traditional rendering method such as Phong-rendering method. Random diffuse algorithm can add the effect of 3D of the yarn.Textile simulation is the core of Dobby CAD system. The paper has studied the difficulties such as handling float, simulating multi-fractal and multi-layer textile exhaustive in textile simulation, and obtained good effect.The paper has studied the Image/Graphics algorithm as the same time, many important function has been realized through the Image/Graphics algorithm.