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Searching about some tilesets for a little RPG game, I've often found these kind of tileset :

enter image description here

Their structure are special, there is two upper tile and 4 others for the same material. I understand that, like that, you have all what you need to create more various shapes than simple rectangles of different sizes. But I don't get how they are used in practice. I'm talking about the two little upper tiles that are used to make some corners. for me the 4 corners are stored inside only one tile ? (hard to explain with my bad english but I'm sure you understand what I mean)

Also, do you know if that tilemapping technic has a name ? And do you kown if it is possible to use them directly in Tiled ?

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This tileset is famous because it was used in RPG maker VX. It seemingly consists of 6 tiles (2 by 3) and it even outputs tiles in that size, but it actually handles the tileset as if it was 4 by 6:

enter image description here

You can then create every tile combination you need (which is 48 in most cases, source here, see the "The blob" section)

For instance, creating a tile, that has grass on the left and right side would look something like this:

enter image description here

Whether you unpack the tileset at start to a better format or deal with drawing 4 sub-tiles each time depends on your preferences.

However, keep in mind that most great tilesets try to make the grid-like nature of these games invisible to the player, but since you don't have much space to work with in an RPG make VX type tileset, the details will suffer.

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These are "Auto Tiles" for the RPGMaker game engine.

While the map editor uses 32x32 tiles as a basic logic unit, the engine actually splits the tiles into 16x16 tiles. The map editor then automatically uses the sub-tiles to generate the fitting transitions. This allows the mapper to draw with just one material while the map editor automatically creates the correct edge- and corner tiles.

Example:

auto tile example

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  • \$\begingroup\$ Tiled has similar functionality. \$\endgroup\$ – Sidar Feb 5 '18 at 11:06

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