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Volumetric ambient occlusion for volumetric models

This paper presents new algorithms to compute ambient occlusion for volumetric data. Ambient occlusion is used in video-games and film animation to mimic the indirect lighting of global illumination. We extend a novel interpretation of ambient occlusion to volumetric models that measures how big portion of the tangent sphere of a surface belongs to the set of occluded points, and propose statistically robust estimates for the ambient occlusion value. The data needed by this estimate can be obtained by separable filtering of the voxel array. As ambient occlusion is meant to obtain global illumination effects, it can provide decisive clues in interpreting the data. The new algorithms obtain smooth shading and can be computed at interactive rates, being thus appropriate for dynamic models exploration

This work was supported by TIN2007-68066-C04-01 and TIN2007-67982-C02 of the Ministry of Education and Science(Spanish Government) and by the 2009 SGR 643 from the Generalitat of Catalunya

© Visual Computer, 2010, vol. 26, p. 687-695

Springer Verlag

Author: Ruiz Altisent, Marc
Szirmay-Kalos, László
Umenhoffer, Tamás
Boada, Imma
Feixas Feixas, Miquel
Sbert, Mateu
Date: 2010
Abstract: This paper presents new algorithms to compute ambient occlusion for volumetric data. Ambient occlusion is used in video-games and film animation to mimic the indirect lighting of global illumination. We extend a novel interpretation of ambient occlusion to volumetric models that measures how big portion of the tangent sphere of a surface belongs to the set of occluded points, and propose statistically robust estimates for the ambient occlusion value. The data needed by this estimate can be obtained by separable filtering of the voxel array. As ambient occlusion is meant to obtain global illumination effects, it can provide decisive clues in interpreting the data. The new algorithms obtain smooth shading and can be computed at interactive rates, being thus appropriate for dynamic models exploration
This work was supported by TIN2007-68066-C04-01 and TIN2007-67982-C02 of the Ministry of Education and Science(Spanish Government) and by the 2009 SGR 643 from the Generalitat of Catalunya
Format: application/pdf
ISSN: 0178-2789 (versió paper)
1432-2315 (versió electrònica)
Document access: http://hdl.handle.net/10256/12313
Language: eng
Publisher: Springer Verlag
Collection: MEC/PN 2007-2010/TIN2007-68066-C04-01
MEC/PN 2007-2010/TIN2007-67982-C02-02
AGAUR/2009-2014/2009 SGR-643
Versió postprint del document publicat a: http://dx.doi.org/10.1007/s00371-010-0497-z
Articles publicats (D-IMA)
Is part of: © Visual Computer, 2010, vol. 26, p. 687-695
Rights: Tots els drets reservats
Subject: Infografia
Computer graphics
Visualització (Informàtica)
Information display systems
Title: Volumetric ambient occlusion for volumetric models
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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