用弯曲体纹理构造发型

Modeling Hairs with Curly Volumetric Textures

毛发的造型和绘制技术是当今计算机图形学中的一个突出难题 .因为头发形状精细、数量庞大 ,传统的造型和绘制技术很难达到令人满意的效果 .针对人的头发 ,提出并在数学上表示出了弯曲体纹理 .接着参照理发师制作发型的过程 ,将头皮曲面予以特别处理 ,并以人头部的形状为依据 ,给出简单发型的构造方法 .然后根据头皮曲面上四边形的结构关系 ,用插值方法将简单造型予以修正和发展 ,给出了几个发型构造的实例 .最后绘制出具有较为真实效果的发型图 .

Furry surface modeling and rendering technique is a difficult problem in computer graphics. It is very hard to obtain satisfactory results for hairstyles through traditional modeling and rendering techniques, because of the fine shapes and the huge amount of human hairs. The concept of curly volumetric textures is first presented and expressed for hairs in this paper. With reference to the process of barber's hairstyle making, scalp surface is specially processed, based on the shape of human head, a simple modeling method is given for hairstyles. Then the head surface is processed and converted to a polyhedron of quadrilaterals of neighboring relationships, and the simple modeling method is modified and developed with interpolation method. Some examples of hairstyle modeling are given. The images of hairstyles are rendered with comparatively realistic effects at last.