Most auto-tile sets consist of 14 tiles, that is, the interior and exterior tiles (full grass and full water tile, for example), top, bottom, left and right edges, four outer corners and four inner corners. A sophisticated tile map editor allows the user to mark such tiles, enabling the editor application to automatically blend in a newly placed tile (for example, water) by placing the correct transitory tiles around it (such as the water-edge in Figure 1). However, manual and proper placement of these transitory tiles tends to be a tedious process.
One such technique entails the use of transition tiles, such as the grass-water and grass-dirt boundaries in the illustration above.
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