Makoto Okabe Yasuyuki Matsushita Li Shen Takeo Igarashi Illumination Brush: Interactive Design of All-Frequency Lighting. 171-180 2007 Pacific Conference on Computer Graphics and Applications http://doi.ieeecomputersociety.org/10.1109/PG.2007.9 conf/pg/2007 db/conf/pg/pg2007.html#OkabeMSI07