United States Patent: 7,042,456

Inventors: Chen; Yanyun, Guo; Baining, Xu; Ying-Qing, Shum; Heung-Yeung

发明人：陈彦云、郭百宁、徐迎庆、沈向洋

Abstract: The present invention provides a systematic method for rendering feathers. In one aspect, a segment of a rachis having a first barb and second barb is generated. The first barb is generated based on a first barb length and the second barb is generated based on a second barb length.