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Importance sampling for volumetric illumination of flames

文献类型：期刊论文

作者Zhang, Yingping1,2; Zhu, Dengming2; Qiu, Xianjie2; Wang, Zhaoqi2
刊名COMPUTERS & GRAPHICS-UK
出版日期2011-04-01
卷号35期号:2页码:312-319
关键词Volumetric illumination Effective radiance Effective mean radiance Clustering Importance sampling
ISSN号0097-8493
DOI10.1016/j.cag.2011.01.001
英文摘要Physically based rendering of scenes with volumetric illumination of flames remains a challenging problem due to the complexity of their heterogeneous radiative properties. Current bidirectional importance sampling strategies have been focusing on emissive light sources without anisotropic extinction. In this paper, we present an efficient importance sampling method for volumetric light sources with anisotropic extinction. According to the radiative properties of flames, we separate the computation of anisotropic extinction from the evaluation of illumination inside flames and utilize cluster-based hierarchies to rapidly estimate them. To exploit the coherence of radiative voxels, we also propose a new similarity metric to aggregate voxels into clusters. For each pixel to be shaded, we use these clusters to rapidly approximate the importance function of voxels, and draw final illumination samples from clusters. Our results show that this approach substantially reduces the variance of images when rendering scenes with flames. (C) 2011 Elsevier Ltd. All rights reserved.
资助项目National Key Technology RD Program[2008BAI50B07] ; NSFC-Guangdong[U0935003]
WOS研究方向Computer Science
语种英语
WOS记录号WOS:000289395900015
出版者PERGAMON-ELSEVIER SCIENCE LTD
源URL[http://119.78.100.204/handle/2XEOYT63/12909]  
专题中国科学院计算技术研究所期刊论文_英文
通讯作者Zhang, Yingping
作者单位1.Chinese Acad Sci, Grad Sch, Beijing 100864, Peoples R China
2.Chinese Acad Sci, Inst Comp Technol, Virtual Real Lab, Beijing 100864, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Yingping,Zhu, Dengming,Qiu, Xianjie,et al. Importance sampling for volumetric illumination of flames[J]. COMPUTERS & GRAPHICS-UK,2011,35(2):312-319.
APA Zhang, Yingping,Zhu, Dengming,Qiu, Xianjie,&Wang, Zhaoqi.(2011).Importance sampling for volumetric illumination of flames.COMPUTERS & GRAPHICS-UK,35(2),312-319.
MLA Zhang, Yingping,et al."Importance sampling for volumetric illumination of flames".COMPUTERS & GRAPHICS-UK 35.2(2011):312-319.

入库方式： OAI收割

来源：计算技术研究所

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