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Today, I’m going to cover one of the most baffling parts of creating tiles for RPG Maker VX/Ace, creating autotiles. If you listen to most people, the autotiles are some kind of bizarre mystical force, not to be trifled with if you value your sanity. But in reality, they are very easy to break down, as long as you know the way they are constructed.
I am not much of an artist, so I will be using an existing autotile, a ground autotile from VX Ace, to show you how they work. I will be using a TileA2 ground autotile, as all other autotiles are just variations on this build. The first step in the construction is to start building from a base tile. A base tile is a standard 32×32 pixel tile. This base tile is copied to cover the entire 2×3 tile autotile. As you can see, this is fairly simple.
All you need to check is that it tiles properly with no odd connections between tiles. Next, lets break down the completed autotile so that we can look at the individual pieces and how they connected. Some people might think that you want to break it into 32×32 pixel tiles. But this would be a bad idea. It doesn’t give us a true idea of how the autotile works together. Instead let’s break it into 16×16 pixel minitiles.
When a target tile (the tile the editor needs to make to match the autotile to existing tiles next to it) is created, the editor selects four of these minitiles and combines them. Breaking the autotile up this way for examination and creation allows us to view them the same way the editor does.
Next let’s label the minitiles so that they are easy to refer to. The first thing to do is remove the 4 minitiles creating a 32×32 pixel section in the upper left corner. These are not used by the editor to create a map, it is only displayed in the editor where you select which tile you want to use.
I’ll explain later how these are done in the RTP. Now, let’s mark the autotiles with a letter based on what corner of a target tile they will go in.
Mark all NW minitiles as A, all NE minitiles as B, all SW minitiles as C, and all SE minitiles as D. There are five of each letter, so I’ll add a number next to them.
We could just go left to right, top to bottom, but I think that I will instead number them by which edges, the four sides of the minitiles, have borders, the design that runs around the autotile. I mark minitiles with inside corners as 1, outside corners as 2, no borders as 3, north or south borders as 4, east or west borders as 5.