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Graphics Interchange Format  |  1997-01-15  |  29.3 KB  |  233x361  |  4-bit (16 colors)
   ocr: Invisible Portion ofPolygon I A Visible Portion Visible Portion of PolygonA: of PolygonB PolygonB-starts here, abutting polygonA At1 A this location, both polygons have: the same1/z vaiue. Viewpoint Figure 2: Abuting-span sorting. Polygons A and. B are viewed from above.