Yasuyuki Matsushita Sing Bing Kang Stephen Lin Heung-Yeung Shum Xin Tong Lighting Interpolation by Shadow Morphing Using Intrinsic Lumigraphs. 58-67 2002 conf/pg/2002 Pacific Conference on Computer Graphics and Applications http://csdl.computer.org/comp/proceedings/pg/2002/1784/00/17840058abs.htm db/conf/pg/pg2002.html#MatsushitaKLST02