tyFlow terrains are square and grid-based. If you want to encapsulate a larger shape with a series of terrain tiles, you can use the Terrain Tile operator under your Object to Terrain operator.
If you just want to scale up a terrain over an underlying object, you can use the Terrain Transform operator.
If you want to match terrain to a non-square perimeter, you'll have to do that as a post-process on your own (ex: encapsulate your object with terrains, then use Edit Mesh after the fact to delete faces which overlap the edges of your underlying object).
If you just want to scale up a terrain over an underlying object, you can use the Terrain Transform operator.
If you want to match terrain to a non-square perimeter, you'll have to do that as a post-process on your own (ex: encapsulate your object with terrains, then use Edit Mesh after the fact to delete faces which overlap the edges of your underlying object).