利用采样球体提取真实感纹理  

Extracting Realistic Textures from Reference Spheres

作　　者：郑作勇[1] 马利庄[1] 曾洲[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《软件学报》2008年第11期3083-3090,共8页Journal of Software

基　　金：Supported by the National Basic Research Program of China under Grant No.2006CB303105 (国家重点基础研究发展计划(973))

摘　　要：提出了一种从真实物体中提取纹理的方法.利用具有复杂纹理的参考球体作为被采样物体,计算其组成材质的BRDF(bidirectional reflectance distribution function)模型参数以及各点由不同材质构成的比例,形成一幅材质权重图.该图作为纹理映射到3D物体上后,配合BRDF模型参数进行渲染,形成一种适用于重光照(relighting)的纹理.被渲染物体可根据自身方位以及光源亮度/方位呈现出自然的光影变化,达到较为逼真的外观效果.A method for extracting realistic textures from real-world reference spheres is proposed in this paper. The BRDF （bidirectional reflectance distribution function） parameters of fundamental materials, as well as a material weight map for the sphere are obtained through a non-linear optimization process. The material weight map can be used as a conventional texture for relighting. With the BRDF models recovered, the rendered 3D objects can exhibit real and complex appearances with varying light direction/intensity, view point and surface orientations.

关 键 词：纹理映射 辐射度 双向反射分布函数 材质权重图 重光照 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]