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Combined correlated and importance sampling in direct light source computation and environment mapping

This paper presents a general variance reduction method that is a quasi-optimal combination of correlated and importance sampling. The weights of the combination are selected automatically in order to keep the merits of both importance and correlated sampling. The proposed sampling method is used for efficient direct light source computation of large area sources and for the calculation of the reflected illumination of environment maps. Importance sampling would be good in these cases if the sources are hidden, while correlated sampling is efficient if the sources are fully visible. The proposed method automatically detects the particular case and provides results that inherit the advantages of both techniques

This work has been supported by the National Scientific Research Fund (OTKA ref. No.: T042735), IKTA ref. No.: 00159/2002, the Bolyai Scholarship, by Intel, and by TIC 2001 2416-C03-01 from the Spanish Government

© Computer Graphics Forum, 2004, vol. 23, núm. 3, p. 585-593

Wiley

Autor: Szécsi, László
Sbert, Mateu
Szirmay-Kalos, László
Data: 27 agost 2004
Resum: This paper presents a general variance reduction method that is a quasi-optimal combination of correlated and importance sampling. The weights of the combination are selected automatically in order to keep the merits of both importance and correlated sampling. The proposed sampling method is used for efficient direct light source computation of large area sources and for the calculation of the reflected illumination of environment maps. Importance sampling would be good in these cases if the sources are hidden, while correlated sampling is efficient if the sources are fully visible. The proposed method automatically detects the particular case and provides results that inherit the advantages of both techniques
This work has been supported by the National Scientific Research Fund (OTKA ref. No.: T042735), IKTA ref. No.: 00159/2002, the Bolyai Scholarship, by Intel, and by TIC 2001 2416-C03-01 from the Spanish Government
Format: application/pdf
ISSN: 0167-7055 (versió paper)
1467-8659 (versió electrònica)
Accés al document: http://hdl.handle.net/10256/14118
Llenguatge: eng
Editor: Wiley
Col·lecció: MICYT/PN 2001-2004/TIC2001-2416-C03-01
Reproducció digital del document publicat a: http://dx.doi.org/10.1111/j.1467-8659.2004.00790.x
Articles publicats (D-IMA)
És part de: © Computer Graphics Forum, 2004, vol. 23, núm. 3, p. 585-593
Drets: Tots els drets reservats
Matèria: Llum -- Simulació per ordinador
Light -- Computer simulation
Models matemàtics
Mathematical models
Visualització tridimensional (Informàtica)
Three-dimensional display systems
Títol: Combined correlated and importance sampling in direct light source computation and environment mapping
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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