| 摘要 |
PROBLEM TO BE SOLVED: To allow high quality anti-aliasing drawing to a shadow and a polygon contour line at comparatively slight costs. SOLUTION: This polygon/silhouette line/anti-aliasing circuit is provided with a means for storing the contour line of a polygon and a means for storing contour line information in which the contour line crosses a grid, a means for performing hidden surface removal by a coordinate point inside the polygon and the contour line information, deleting the contour line to be a polygon sharing side from a buffer to store only the contour line information of a silhouette line pixel, a means for reading the stored contour line information to judge positions inside and outside the polygon when the point is on the silhouette line and a means for attenuating a luminance value in order to determine luminance of the shadow. As for anti-aliasing of a viewpoint coordinate system, silhouette line information of the polygon is stored, color information is further stored in the contour line information, the contour line information is read for the luminance of the pixel in which a drawing point becomes the silhouette line and the color information is proportionally distributed from each area ratio crossing in pixel grid to determine the luminance. COPYRIGHT: (C)2007,JPO&INPIT |
