| 摘要: |
| 人物的绘制是当今计算机图形学中的一项重要任务，特别吸引人的是头发的生成技术.头发生成技术的难点在于其精细的形状和庞大的数量.文章针对头发提出了弯曲纹元和三维纹理体的概念，并给出了它们的数学表达式以及对不同发型的描述方法.弯曲纹元和三维纹理体是一般三维纹理的结构.带三维纹理的景物是由弯曲纹元和三维纹理体构成的，三维纹理体可再分成多个弯曲纹元，因而指明了三维纹理空间的结构，并解决了三维纹理曲面的造型问题.文章通过不同例子表明了结构造型方法在描述头发中的应用价值. |
| 关键词: 纹元，三维纹理，Bézier体，剖分，造型. |
| DOI： |
| 分类号: |
| 基金项目:本文研究得到国家自然科学基金资助. |
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| Structural Modeling for Hairs |
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ZHANG Xiao-peng,WU En-hua
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| Abstract: |
| Synthetic image of human body is an important task in computer graphics, in which hair generation technique is especially attractive. The key point in hair generation is its fine shapes and large quantity. A method for describing 3D texture space with two concepts, curved texel and texid, i.e. 3D texture solid, is presented for hairs. The authors also give mathematical expressions of curved texels and texids for the different hair styles. Texids and curved texels are structural organizations of 3D textures. Scenes with 3D textures are made up of texids and curved texels, and a texid can be divided into curved texels, which indicates the structure of 3D texture space, and solves the modeling problem of 3D texture surfaces. The application value of structural modeling for hair description is proved through several examples. |
| Key words: Texel, 3D texture, Bézier solid, subdivision, modeling. |
