复杂环境光照下的半透明材质恢复算法  

Material Recovery Algorithm of Translucent Object under Complex Environment Illumination

作　　者：卜海亮[1] 孙延奎[1] 唐泽圣[1] 

机构地区：[1]清华大学计算机科学与技术系,北京100084

出　　处：《计算机辅助设计与图形学学报》2006年第5期638-643,共6页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家自然科学基金(60203003;30470487)

摘　　要：针对半透明材质的特性,将折射率和BRTDF模型同时引入绘制过程,给出一套有效的求解复杂环境光照下半透明物体参数的算法.通过分析各参数间的相互关系和作用,依次估计半透明材质的颜色、折射率、透射系数、漫反射系数、镜面反射系数和表面粗糙度系数,然后将这些参数值作为初值重复上述计算过程,利用这种递归的方法逐次求精各参数.实验表明,该算法在少数几次递归后能够高精度地恢复半透明材质参数,而且这些恢复的参数可有效地用于新场景的绘制.Based on the reflective and refractive phenomena of translucent objects, this paper proposes an algorithm to recover the material properties of the objects under complex environment illumination, where refractive index and the BRTDF model both are considered in the rendering process. This algorithm first estimates all the material parameters in the sequence of object color, refractive index, transmission coefficient, diffuse reflection coefficient, mirror reflection coefficient, surface roughness coefficient, then the processing procedure repeats by using these parameter values as initial ones, and finally all the parameters are obtained in the solution through this recursive method. Experiments show that the algorithm is able to recover the material parameters of translucent objects with high accuracy by a few recursive steps, and the recovered parameters can be used to render the translucent objects in a new scene effectively.

关 键 词：半透明物体 材质恢复 折射率 BRTDF模型 模拟退火算法 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]