Isthmus

The number of the first vertex to be indented.

Sets the HCen terrain. Sets the two opposite HCorners and sets the four HSep terrains adjacent to the pulled in vertices. The HSep terrains can be different on either HSep of the isthmus. For eample it could be sea on one HSep and fresh water lake on the other.

The number of the first vertex to be indented.

The terrain of the HSeps, next to the index vertex, typically a type of water.

The terrain of the HSeps, next to the opposite vertex typically a type of water.

The terrain of the main tile, typically a type of land.