Fast, realistic lighting for video games

Iones, A.; Krupkin, A.; Sbert, Mateu; Жуков, С. Н.

doi:10.1109/mcg.2003.1198263

Cited by 52 publications

(28 citation statements)

References 12 publications

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“…A different effect is obtained by adding the AO term to the local lighting equation, as in the global illumination case where ambient occlusion fakes indirect illumination [11]. Then, the final color of a voxel is obtained as…”

Section: Ambient Occlusionmentioning

confidence: 99%

Viewpoint information channel for illustrative volume rendering

Ruiz

Boada

Feixas

et al. 2010

Computers & Graphics

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This paper introduces a volume rendering framework based on the information channel constructed between the volumetric data set and a set of viewpoints. From this channel, the information associated to each voxel can be interpreted as an ambient occlusion value that allows to obtain illustrative volume visualizations. The use of the voxel information combined with the assignation of color to each viewpoint and non-photorealistic effects produces an enhanced visualization of the volume data set. Voxel information is also applied to modulate the transfer function and to select the most informative views.

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Section: Ambient Occlusionmentioning

confidence: 99%

Viewpoint information channel for illustrative volume rendering

Ruiz

Boada

Feixas

et al. 2010

Computers & Graphics

Self Cite

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“…Zhukov et al introduced ambient occlusion with the term obscurances [17,4]. Roughly speaking, obscurance measures the part of the hemisphere obscured by the neighbor surfaces.…”

Section: Obscurances and Ambient Occlusionmentioning

confidence: 99%

“…Obscurances or ambient occlusion (AO) was introduced by Zhukov et al [17], Iones et al [4], and Landis [6] as an efficient technique that gives perceptually similar results to global illumination with a small fraction of the computational cost. The obscurance/ambient occlusion technique was first used in video-game environments.…”

Section: Introductionmentioning

confidence: 99%

Volumetric ambient occlusion for volumetric models

et al. 2010

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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.

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“…Thus, low values of PMI, corresponding to non-occluded or visible (from many viewpoints) polygons, are represented by values near 1 in the grey-map, while high values of PMI, corresponding to occluded polygons, are represented by values near 0 in the grey-map. Observe that these maps look as an ambient occlusion or obscurance map (see [22,6,40,18]). For more details see [13].…”

Section: I(z;vmentioning

confidence: 99%

Information Theory Tools for Viewpoint Selection, Mesh Saliency and Geometry Simplification

Sbert

Feixas

Castelló

et al. 2009

Studies in Computational Intelligence

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In this chapter we review the use of an information channel as a unified framework for viewpoint selection, mesh saliency and geometry simplification. Taking the viewpoint distribution as input and object mesh polygons as output vectors, the channel is given by the projected areas of the polygons over the different viewpoints. From this channel, viewpoint entropy and viewpoint mutual information can be defined in a natural way. Reversing this channel, polygonal mutual information is obtained, which is interpreted as an ambient occlusion-like quantity, and from the variation of this polygonal mutual information mesh saliency is defined. Viewpoint entropy, viewpoint Kullback-Leibler distance, and viewpoint mutual information are then applied to mesh simplification, and shown to compare well with a classical geometrical simplification method.

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Fast, realistic lighting for video games

Cited by 52 publications

References 12 publications

Viewpoint information channel for illustrative volume rendering

Viewpoint information channel for illustrative volume rendering

Volumetric ambient occlusion for volumetric models

Information Theory Tools for Viewpoint Selection, Mesh Saliency and Geometry Simplification

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