Submitted by stedevil
I think it would be very wise to add "1 more layers of floortiles 'above' the regular layer" to severely lower the amount of different tiles need eg for a road/path (due to having transparent edges) that should blend with multiple underlayer (grass, sand, etc).
Especially if we implement diagonal roads the saved work and amount of tiles reduction will be substantial. Even if we just have the possibility of sand, grass & concrete (?) the required road tiles are cut by 2/3. and as a bonus we can have roads on ANY current or future tile background as soon as a "path" or other "stuck to ground obstacle with transparent edge" is added.
If this is implemented it could be worth it to investigate how much more complex it would be to make the floor 3 layers, the 3rd being "lower" than the current. This could enable us to perhaps place water or something else visually lower (eg water can flow slightly below the edge of grass, not level to it).
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