Yanyun Chen Yingqing Xu Baining Guo Heung-Yeung Shum Modeling and rendering of realistic feathers. 630-636 2002 conf/siggraph/2002 SIGGRAPH http://doi.acm.org/10.1145/566570.566628 db/conf/siggraph/siggraph2002.html#ChenXGS02