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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

Wiley

Manager: Ministerio de Ciencia y Tecnología (Espanya)
Author: Szécsi, László
Sbert, Mateu
Szirmay-Kalos, László
Abstract: 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
Document access: http://hdl.handle.net/2072/299567
Language: eng
Publisher: Wiley
Rights: Tots els drets reservats
Subject: Llum -- Simulació per ordinador
Light -- Computer simulation
Models matemàtics
Mathematical models
Visualització tridimensional (Informàtica)
Three-dimensional display systems
Title: Combined correlated and importance sampling in direct light source computation and environment mapping
Type: info:eu-repo/semantics/article
Repository: Recercat

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