2026-04-18T07:38:20Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/116762024-06-18T12:15:53Zcom_2072_452955com_2072_2054col_2072_453069

Energy-saving light positioning using heuristic search Castro Villegas, Francesc Acebo Peña, Esteve del Sbert, Mateu Ministerio de Ciencia e Innovación (Espanya) Generalitat de Catalunya. Agència de Gestió d'Ajuts Universitaris i de Recerca Programació heurística Heuristic programming Intel·ligència artificial Artificial intelligence Algorismes genètics Computer algorithms A new definition is given to the problem of light positioning in a closed environment, aiming at obtaining, for a global illumination radiosity solution, the position and emission power for a given number of lights that provide a desired illumination at a minimum total emission power. Such a desired illumination is expressed using minimum and/or maximum values of irradiance allowed, resulting in a combinatory optimization problem. A pre-process computes and stores irradiances for a pre-established set of light positions by means of a radiosity random walk. The reuse of photon paths makes this pre-process reasonably cheap. Different heuristic search algorithms, combined to linear programming, are discussed and compared, from the simplest hill climbing strategies to the more sophisticated population-based and hybrid approaches. The paper shows how the presented approaches make it possible to obtain a good solution to the problem at a reasonable cost This project has been funded in part with grant number TIN2010-21089-C03-01 from Spanish Government, and with grant number 2009 SGR 643 from Catalan Government info:eu-repo/date/embargoEnd/2026-01-01 info:eu-repo/date/embargoEnd/2026-01-01 2012 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/10256/11676 http://hdl.handle.net/10256/11676 eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.engappai.2011.11.009 info:eu-repo/semantics/altIdentifier/issn/0952-1976 info:eu-repo/semantics/altIdentifier/issn/0952-1976 info:eu-repo/grantAgreement/MICINN//TIN2010-21089-C03-01/ES/CONTENIDO DIGITAL PARA JUEGOS SERIOS: CREACION, GESTION, RENDERIZADO E INTERACCION/ AGAUR/2009-2014/2009 SGR-643 Tots els drets reservats info:eu-repo/semantics/embargoedAccess application/pdf Elsevier © Engineering Applications of Artificial Intelligence, 2012, vol. 25, núm.3, p. 566-582 Articles publicats (D-IMA)