Terrain types are not always mutually compatible. Incompatible types may not be juxtaposed, either at game setup time or by unit action during a game.
Table: adjacent-terrain-effect
t1 t2 -> t3
This table specifies what will happen to a cell of type t1
adjacent to a cell of type t2. If t3 is non-terrain
,
nothing will happen, otherwise it will become a cell of type t3.
If t1 is a border type adjacent to a cell of type t2.
If t3 is non-terrain
, nothing will happen.
Otherwise, the border of type t1 will be removed,
and if t3 is a border type, a border of that type will be added.
The effect on connection types is analogous.
Defaults to non-terrain
.