A rasterizer implementing a single edge stepping interpolator to interpolate both diffuse and specular lighting components across an edge of the primitive, and/or a single span stepping interpolator to interpolate both diffuse and specular lighting components across the spans of the primitive. When the...http://www.google.com.tw/patents/US6707453?utm_source=gb-gplus-share專利 US6707453 - Efficient rasterization of specular lighting in a computer graphics system
