Concentric spherical representation for omnidirectional soft shadow

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
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Detail(s)

Original languageEnglish
Pages (from-to)201-213
Journal / PublicationComputer Graphics Forum
Volume32
Issue number6
Publication statusPublished - Sep 2013

Abstract

Soft shadows play an important role in photo-realistic rendering. Although there are many efficient soft shadow algorithms, most of them focus on the one-side light source situation, where a planar light source is on the outside of the scene. In fact, in many situations, such as games, light sources are omnidirectional. They may be surrounded by a number of 3D objects. This paper proposes a soft shadow algorithm for the omnidirectional situation. We develop a concentric spherical representation to model the behaviour of omnidirectional light sources. To provide better rendering results, a novel summed area table based filtering scheme for spherical functions is proposed. In addition, we utilize unicube mapping, which samples the spherical space more uniformly, to further improve the filtering quality. Soft shadows play an important role in photo-realistic rendering. Although there are many efficient soft shadow algorithms, most of them focus on the one-side light source situation, where a planar light source is on the outside of the scene. In fact, in many situations, such as games, light sources are omnidirectional. They may be surrounded by a number of 3D objects. This paper proposes a soft shadow algorithm for the omnidirectional situation. © 2013 The Eurographics Association and John Wiley & Sons Ltd.

Research Area(s)

  • convolution shadow map, cube map, omnidirectional soft shadow, summed area table

Citation Format(s)

Concentric spherical representation for omnidirectional soft shadow. / Xiao, Yi; Leung, Chi Sing; Ho, Tze Yui; Wan, Liang; Wong, Tien Tsing.

In: Computer Graphics Forum, Vol. 32, No. 6, 09.2013, p. 201-213.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review