LU, Heqi; PACANOWSKI, Romain; GRANIER, Xavier

doi:10.1109/TVCG.2014.2359466

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Licence d’utilisation du document

LU, Heqi
Melting the frontiers between Light, Shape and Matter [MANAO]
Laboratoire Bordelais de Recherche en Informatique [LaBRI]
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

PACANOWSKI, Romain
Laboratoire Photonique, Numérique et Nanosciences [LP2N]
Melting the frontiers between Light, Shape and Matter [MANAO]

GRANIER, Xavier
Melting the frontiers between Light, Shape and Matter [MANAO]
Laboratoire Bordelais de Recherche en Informatique [LaBRI]
Laboratoire Photonique, Numérique et Nanosciences [LP2N]

Langue

Article de revue

Ce document a été publié dans

IEEE Transactions on Visualization and Computer Graphics. 2015, vol. 21, n° 2, p. 241 - 251

Institute of Electrical and Electronics Engineers

Résumé en anglais

The possibility to use real world light sources (aka luminaires) for synthesizing images greatly contributes to their physical realism. Among existing models, the ones based on light fields are attractive due to their ability to represent faithfully the near-field and due to their possibility of being directly acquired. In this paper, we introduce a dynamic sampling strategy for complex light field luminaires with the corresponding unbiased estimator. The sampling strategy is adapted, for each 3D scene position and each frame, by restricting the sampling domain dynamically and by balancing the number of samples between the different components of the representation. This is achieved efficiently by simple position-dependent affine transformations and restrictions of Cumulative Distributive Functions that ensure that every generated sample conveys energy and contributes to the final result. Therefore, our approach only requires a low number of samples to achieve almost converged results. We demonstrate the efficiency of our approach on modern hardware by introducing a GPU-based implementation. Combined with a fast shadow algorithm, our solution exhibits interactive frame rates for direct lighting for large measured luminaires.< Réduire

Mots clés en anglais

Light Field

Importance Sampling

Models of Light Sources

URI

https://oskar-bordeaux.fr/handle/20.500.12278/182047

DOI

http://dx.doi.org/10.1109/TVCG.2014.2359466

Project ANR

Analyse des opérateurs de transport lumineux et applications - ANR-11-BS02-0006

Origine

Importé de hal

Unités de recherche

Laboratoire Photonique, Numérique et Nanosciences (LP2N) - UMR 5298