Autotile Artwork - rotorz/unity3d-tile-system GitHub Wiki
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The artwork of an autotile comprises of several key tiles that are each divided into 4 sub-tiles. These sub-tiles can then be automatically mixed and matched to form tiles that better fit other orientations.
You can design the artwork of an autotile using a regular graphics package. This artwork can then be selected when you create the autotile tileset. An atlas texture will be generated automatically from your autotile artwork upon creating the tileset. The generated atlas is saved as a PNG file which can be modified using a graphics package if desired.
Remember - The atlas of an autotile must be regenerated whenever changes are made to the input artwork so that any modifications are realized.
When designing artwork for an autotile it is important to keep detailed contained within its respective sub-tile. The "Bad" tile in the following example demonstrates a corner tile where the flower overlaps two sub-tiles:
Tip - The larger white flower could be added to the "upper left" corner tile manually by modifying the generated atlas texture instead than placing it within the input autotile artwork. Although any such manual modiications will be lost if the autotile atlas is regenerated.
The 'basic' autotile layout has 6 key tiles each subdivided into 4 sub-tiles that can then be automatically pieced together to form 46 tiles.
Remember - Tiles can be of any even size. Borders can be automatically added to generated tiles but must not be added manually to the input artwork.
The extended autotile layout has dedicated corner and edge tiles allowing you to add greater detail and define rounder edges. The layout consists of 12 key tiles that are subdivided into 4 sub-tiles to form an output atlas of 47 tiles.
Remember - Tiles can be of any even size. Borders can be automatically added to generated tiles but must not be added manually to the input artwork.
Source: topics/Autotile-Artwork.md