2026-04-17T04:19:58Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/123132025-04-30T23:47:52Zcom_2072_452955com_2072_2054col_2072_453069

00925njm 22002777a 4500 dc Ruiz Altisent, Marc author Szirmay-Kalos, László author Umenhoffer, Tamás author Boada, Imma author Feixas Feixas, Miquel author Sbert, Mateu author 2010 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 Infografia Computer graphics Visualització (Informàtica) Information display systems Volumetric ambient occlusion for volumetric models