Customize how Unity creates tiles from a texture

To customize how Unity creates tiles from a texture, create a script that inherits from TileTemplate.

Note: TileTemplate only works when you automatically create a tile palette using a tileset, not when you create your own tile palette. For more information, refer to Create a tileset.

Follow these steps:

In the Project window, create a folder called Editor.
To create a new C# script, right-click the Editor folder then select Create > MonoBehaviour script.

Open the script and replace the code with a class that inherits from UnityEngine.Tilemaps.TileTemplate. For example:

using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Tilemaps;

public class MyTileTemplate : TileTemplate
{
}

Implement the CreateTileAssets method. This method provides you with the source texture and its spritesA 2D graphic objects. If you are used to working in 3D, Sprites are essentially just standard textures but there are special techniques for combining and managing sprite textures for efficiency and convenience during development. More info
See in Glossary, so you can write code that creates and places tiles in the tile palette.

For example, the following code creates a single row of tiles in the tile palette from the sprites in the source texture:

public override void CreateTileAssets(Texture2D texture2D, IEnumerable<Sprite> sprites, ref List<TileChangeData> tilesToAdd)
{
    int xTilePosition = 0;

    // For each sprite in the source texture
    foreach (Sprite sprite in sprites)
    {
        // Create a new tile instance and assign the sprite
        Tile newTile = ScriptableObject.CreateInstance<Tile>();
        newTile.name = sprite.name;
        newTile.sprite = sprite;

        // Position the tile at the current X position in the tile palette
        tilesToAdd.Add(new TileChangeData()
        {
            position = new Vector3Int(xTilePosition, 0, 0),
            tile = newTile,
            transform = Matrix4x4.identity,
            color = Color.white
        });

        // Increment the x position for the next tile
        xTilePosition++;
    }
}

To create instances of the tile template in your project, add a CreateAssetMenu attribute before the class declaration.
```
[CreateAssetMenu]
public class MyTileTemplate : TileTemplate
{
    // ...
}
```
Create an instance of the tile template in the Project window. For example in the previous example, from the main menu, select Assets > Create then the name of your TileTemplate class.
Create a tileset.
After you add a texture to the tileset, drag the tile template asset from the Project window to the Tile Template field in the Tile Set Importer InspectorA Unity window that displays information about the currently selected GameObject, asset or project settings, allowing you to inspect and edit the values. More info
See in Glossary window.
Select Apply, then open the Tile Palette Window to check the tiles created by your tile template.

Additional resources

Create a custom tile that runs a script

Create a custom brush that runs a script

Tilemaps reference

Unity Manual

Customize how Unity creates tiles from a texture

Additional resources