LU, Heqi; PACANOWSKI, Romain; GRANIER, Xavier

doi:10.1111/cgf.12220

Métadonnées

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

Computer Graphics Forum. 2013-10-07, vol. 32, n° 7, p. 131-136

Wiley

Résumé en anglais

Monte Carlo Techniques are widely used in Computer Graphics to generate realistic images. Multiple Importance Sampling reduces the impact of choosing a dedicated strategy by balancing the number of samples between different strategies. However, an automatic choice of the optimal balancing remains a difficult problem. Without any scene characteristics knowledge, the default choice is to select the same number of samples from different strategies and to use them with heuristic techniques (e.g., balance, power or maximum). In this paper, we introduce a second-order approximation of variance for balance heuristic. Based on this approximation, we introduce an automatic distribution of samples for direct lighting without any prior knowledge of the scene characteristics. We demonstrate that for all our test scenes (with different types of materials, light sources and visibility complexity), our method actually reduces variance in average.We also propose an implementation with low overhead for online and GPU applications. We hope that this approach will help developing new balancing strategies.< Réduire

Mots clés en anglais

Multiple Importance Sampling

Direct Lighting

Importance Sampling

URI

https://oskar-bordeaux.fr/handle/20.500.12278/181708

DOI

http://dx.doi.org/10.1111/cgf.12220

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