2026-04-14T03:32:01Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/141182024-06-18T12:17:01Zcom_2072_452955com_2072_2054col_2072_453069

00925njm 22002777a 4500 dc Szécsi, László author Sbert, Mateu author Szirmay-Kalos, László author info:eu-repo/date/embargoEnd/2026-01-01 info:eu-repo/date/embargoEnd/2026-01-01 2004-08-27 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 http://hdl.handle.net/10256/14118 Llum -- Simulació per ordinador Light -- Computer simulation Models matemàtics Mathematical models Visualització tridimensional (Informàtica) Three-dimensional display systems Combined correlated and importance sampling in direct light source computation and environment mapping