How to create Terrain in Unity
Notes:
How to create Terrain or Open game environment in Unity:
Creating Terrain:
Game Object Menu - 3D Object - Terrain
Unity creates a game object with the name “Terrain”; which is attached with Terrain and Terrain collider components.
It also creates an asset with the name “New Terrain”; which stores and manages data about Terrain. Terrain data is required for handling collisions.
Note: if you delete a Terrain game object, you also need to delete its associated Terrain asset.