Open Scenes/Demo_TopdownTiles.unity first. It lays out all twelve terrains as 21-tile patches built from the blob set, so you can see every terrain and how the edges behave in one screen. Plain SpriteRenderers, no scripts, no package dependencies.

What imports: Assets/Rasterloom/TopdownTiles/Textures/ then one folder per terrain - 47 blob tiles, 16 corner tiles and 4 fill variants for each of the twelve terrains, at 32 px and 64 px, 1,608 sprites in total. Pick one size per project and delete the other.

File names follow T_Grass_Blob_223_64.png. For the blob set that number IS the eight-neighbour bitmask, so a Dictionary of int to Sprite built straight from the file name needs no extra table. For the corner set the code is nw ne se sw as four binary digits.

Import settings are already correct: Texture Type Sprite (2D and UI), Sprite Mode Single, Filter Mode Point, Compression None, Generate Mip Maps off, Alpha Is Transparency on, and Pixels Per Unit set to the tile size. With PPU equal to the tile size, one tile is exactly one Tilemap cell, so set the Grid Cell Size to (1, 1, 0) and everything lands where it should. Leave mip maps off - they are what makes tiles go soft the moment the camera stops sitting on a whole pixel.

Documentation/AutoTileTable.json.txt is included as a TextAsset. Read blob47.lookup into an int[256] and auto-tiling is one array read: build the mask from the eight neighbours, index the table, take the sprite.

No package dependencies. The set can drive a Rule Tile from com.unity.2d.tilemap.extras, but the pack does not ship one, because that would force the package dependency on everybody.

Also in the additional files download: atlas sheets, Tiled .tsx tilesets, every tile as a loose PNG, notes for Godot 4, Unreal Paper2D and hand-rolled engines, demo maps, and an offline HTML browser.

Rasterloom

Rasterloom

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