【作者】 王梅珍；

【导师】 王善元； 王府梅；

【作者基本信息】 东华大学 ， 纺织材料与纺织品设计， 2004， 博士

【摘要】 本论文研究开发了一套集织物设计、织物模拟到虚拟场景仿真于一体化的织物CAD集成系统,不但为织物设计生产提供了便捷工具,而且也为消费者选择织物、预知产品的视觉效果提供了帮助。本论文主要研究了织物CAD集成系统实现过程中的几个关键技术:组织编辑、分色技术、纱线模拟、织物真实感模拟、蜂巢组织外观的产生原理、虚拟场景仿真等。 组织编辑功能的强弱直接影响到织物CAD系统的实用性。作为整个系统的基础,本论文首先研究了经纬组织点取反、角度旋转变换、对称轴变换、翻转变换、山形斜纹变换、移位变换等十几种组织编辑的算法,并在本系统中实现了这些编辑功能。 曲线斜纹和复合斜纹是变化斜纹的两大类型,在织物设计中被广泛应用。本文研究了一种以复合斜纹为基础的曲线斜纹快速生成的新算法,创建了左移矩阵函数,建立了曲线斜纹生成的理论模型,只要输入基础组织、飞数个数及飞数变化方向,系统就会自动生成曲线斜纹的组织图。新算法可以快速简便地设计曲线斜纹。 分色是印花CAD和纹织CAD系统中需要解决的首要问题。本文研究了一种采用快速迭代方法实现等距离聚类分析的分色算法,对于任意一幅给定的图片可以快速而又准确地实现其设定颜色种类的分色。 织物真实感模拟是仿真技术的重点和难点,本文首先从影响纱线的几个主要因素颜色、纱支、捻度、捻向、毛羽、光照性能等入手,建立了纱线的模型,用户只要输入这些因素的主要参数,系统就会自动实现纱线模拟。用户可以根据国际标准色PANTONE色卡进行颜色编辑,也可以根据需要自己编辑色卡以备调用。本文还建立了段染纱和雪尼尔纱的纱线模型并实现了段染纱和雪尼尔纱的模拟。 为进行织物表面模拟,本文建立了纱线纵横向几何结构模型,根据纱线排列及织物密度,结合光照模型,实现了织物的模拟,不但增强了普通织物模拟的立体感,而且还可以模拟经纬同色的素织物及经纬同色但不同捻向相问排列所产生的隐条效果。本文还实现了段染纱和雪尼尔纱织物的模拟,并对典型的复杂组织—蜂巢组织进行了织物外观产生原理的探讨,找出了影响蜂巢组织外观的主要因更多还原

【Abstract】 A suit of fabric CAD integration system, which including the fabric design and fabric simulation in 3D virtual environment, has been studied and implored in this paper. The system not only provides a convenient tool for the design and produce of fabric but also gives consumers the good direction of fabric choosing.The key-technology in the implement process of fabric CAD integration system, such as weave editing, colour quantization, yarn simulation, fabric 3D simulation, the principle on the development of honeycomb weave appearance , cloth simulation in 3D virtual environment, and so on, is mainly studied in this paper.The practicability of the fabric CAD system is affected by the function of weave editing. Over ten arithmetic of weave editing, such as basic symmetric pattern flip, basic symmetric reverse pattern flip, symmetric diagonal pattern flip, waved twills flip and so on are introduced, and all above functions are realized in the system.The curved and compound twill, which are the two main kinds of diversified twill, have been widely used in fabric design. The paper introduces a new algorithm to create curved twill. Using the left shift matrix function, it establishes the theory model to create curved twill. If the basic weave, the number of fly and the direction of flip is input, the system will create the curved twill automatically and quickly.Color quantization is the chief problem to resolve in printing CAD and Jacquard CAD system. The paper develops a color quantization algorithm which is based on the cluster analysis with the same range. using the faster interative, it can separate the color quickly for images.Focused on some main factors, such as color, count, twist, direction of twist, hairiness, and illumination , the model of yarn is established. The users only needs to input the main parameters of the factors, the system will simulate the yarn automatically. Users can edit the color according to the PENTONE color palette, they can also create color palettes by themselves. The paper also establishes the model of space dyed yarn, Chenille and takes the simulation on them as well.Then the paper sets up the geometry model of the yarn, according to the yarn array, fabric density and the illumination model, the system realized fabric 3D simulation. Not only patterns made of the same color of weft and warp yarns but the faint stripe effect caused by the array of yarn with different direction of twist of the same colorcan also be clearly identified. The paper also researches the principle on how the appearance of honeycomb weave developed, the chief factor which affect the appearance of honeycomb weave is found out, this research lays a good foundation for the simulation of complex weave.Cloth simulation in 3D virtual environment is studied by using the mesh technique and texture mapping, mesh adjusting tools such as mesh stretching, revolving, translation and mesh apex adjusting are established. Users can input the images and adjust the mesh interactively. The exchange relationship of color space between HSV and RGB by using the coordinates is established. It is proved that the relationship can reflect the transfer of color more properly and the uniformity of the established color space is more adaptive to the feel of human to colors.Fabric design is a complete design, we should first focus on the practical purpose of fabric to design the elementary quality and outlook style, then create the design scheme. After doing this, we can decide how to design and process the fiber, yarn and fabric. At last the paper makes a prospect to the fabric CAD system as a whole.更多还原