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Graphics Interchange Format  |  1996-11-11  |  24.4 KB  |  608x779  |  4-bit (5 colors)
   ocr: TILE RENDERING 9:fan perc t 7:fan 8:fans 4:fans latiitude stride 6:fans 5:strips 1:fan 2:fans 3:fan b perc perc_ longitude, perc_r stride Tiles are rendered as 9 areas, in the above sequence. Tile centers are rendered with triangle strips, identical to the non-tiled version. Tile edges are - seamed" with triangle fans. Each corner fan has two types, depending on whether the corner vertex is above or below the diagonal. (All possible types are not diagrammed here, just examples) "Perc X" values are interpolants, expressed as a fraction ofthe latitude or longitude strides, and used to compute ti ...