The present invention detects polygons located in a region of diffused light or specular light, divides that polygon and generates subdivided polygons, and for those polygons, carries out lighting processing and rendering processing using linear interpolation according to the conventional Gouraud shading...http://www.google.com.hk/patents/US6400842?utm_source=gb-gplus-share專利 US6400842 - Image processing apparatus and image processing method
