Sets the subtile that will be used as an icon in an atlas/autotile given its coordinates.
The subtile defined as the icon will be used as a fallback when the atlas/autotile's bitmask information is incomplete. It will also be used to represent it in the TileSet editor.
Sets the subtile that will be used as an icon in an atlas/autotile given its coordinates. The subtile defined as the icon will be used as a fallback when the atlas/autotile's bitmask information is incomplete. It will also be used to represent it in the TileSet editor.