Importance sampling for volumetric illumination of flames

doi:10.1016/j.cag.2011.01.001

	Importance sampling for volumetric illumination of flames
	Zhang, Yingping 1,2; Zhu, Dengming 1; Qiu, Xianjie 1; Wang, Zhaoqi 1
	2011-04-01
发表期刊	COMPUTERS & GRAPHICS-UK
ISSN	0097-8493
卷号	35 期号:2 页码:312-319
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.
关键词	Volumetric illumination Effective radiance Effective mean radiance Clustering Importance sampling
DOI	10.1016/j.cag.2011.01.001
收录类别	SCI
语种	英语
资助项目	National Key Technology RD Program[2008BAI50B07] ; NSFC-Guangdong[U0935003]
WOS研究方向	Computer Science
WOS类目	Computer Science, Software Engineering
WOS记录号	WOS:000289395900015
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.204/handle/2XEOYT63/12910
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, Inst Comp Technol, Virtual Real Lab, Beijing 100864, Peoples R China 2.Chinese Acad Sci, Grad Sch, 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.