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三维包装CAD系统材质功能的研究

The Study of the Material Function in 3D Packaging CAD System

【作者】 王保升

【导师】 王迪功; 和克智;

【作者基本信息】 西安理工大学 , 包装工程, 2003, 硕士

【摘要】 本文从目前包装CAD的现状出发,分析了开发三维包装CAD系统材质功能模块的必要性和可行性,为三维包装CAD系统材质功能模块的开发从理论上提供了可行的方法和总结出经验模型,并且编程实现了这些模型,进而为开发商用三维包装CAD系统软件中的材质功能提供了基础。首先,利用计算机图形生成技术采用合理的数据结构,建立三维数据模型为实现包装CAD系统材质功能提供对象物。其次,根据材质属性的不同将材质分为标准材质和非标准材质,并且根据材质的不同属性而采用不同的方法进行模拟,对标准材质,如铜、铁通过光照明模型技术来模拟;对木材等非标准材质通过纹理映射技术来逼真的模拟,并分析总结出模拟各种材质的经验模型,即一个初步的纹理生成函数,在此基础上对函数进行了数学演变,最终建立一个比较完善的纹理生成函数,并且对函数中的主要影响因素进行了分析。最后,借助真实感图形生成技术,材质功能和渲染技术,实现了三维实体的投影变换、消隐、光照明模型和画面绘制,并且按照得出的算法赋予其材质属性。这样使得包装CAD系统可以实现高度真实感的模型,对实体进行逼真的模拟,从而更有力地帮助我们进行包装产品的设计、包装商品的宣传。

【Abstract】 According to the present condition of the packaging CAD, The paper analyzes necessity and possibility of developing material module of 3D packaging CAD , provides the viable method on theory, sums up experiential model and puts forward concrete method. First, the paper analyzes how to establish the 3D model for material function studying by using computer graphics technology and reasonable date-construction. Second, according to different characteristics of the different material, the material is divided into the standard material and non-standard material. The paper points out that different material must be imitated through different methods. In the paper, the standard material is imitated by using illumination model, and the non-standard material is imitated by using texture and illumination model. Last, Using the realistic image synthesis technique, material function and the rendering technique, I realize the scene modeling, projection transformation, visible-surface detection, illumination model and surface rendering in this paper. By this, packaging CAD system can build model with high reality and produce strong inspiring impression and do simulation with reality. For doing all of these, ourpurpose is using computer graphics to help us to design packaging products and propagandize packaging commodity.

  • 【分类号】TP391.72
  • 【下载频次】104
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