2026-04-04T02:25:02Zhttps://recercat.cat/oai/request

oai:recercat.cat:10256/71382024-06-14T10:06:31Zcom_2072_452955com_2072_2054col_2072_453069col_2072_453081

00925njm 22002777a 4500 dc Mas Baixeras, Albert author Martín Campos, Ignacio author Patow, Gustavo author 2009 This paper presents a new inverse reflector design method using a GPU-based computation of outgoing light distribution from reflectors. We propose a fast method to obtain the outgoing light distribution of a parametrized reflector, and then compare it with the desired illumination. The new method works completely in the GPU. We trace millions of rays using a hierarchical height-field representation of the reflector. Multiple reflections are taken into account. The parameters that define the reflector shape are optimized in an iterative procedure in order for the resulting light distribution to be as close as possible to the desired, user-provided one. We show that our method can calculate reflector lighting at least one order of magnitude faster than previous methods, even with millions of rays, complex geometries and light sources This work was done under grant TIN2007-67120 from the Spanish Government, and under grant 7th Framework Programme-Capacities (grant No 222550, project EcoStreetLight) from the UE http://hdl.handle.net/10256/7138 Llums -- Disseny assistit per ordinador Lamps -- Computer-aided design Optimització matemàtica Mathematical optimization Fast Inverse Reflector Design (FIRD)