Unity 2019.1 features a new Terrain Tools package for automating terrain creation.
Create a new project in Unity 3D from the Unity Hub:
Install the Terrain Tools package in the Unity project by going to Window » Package Manager:
In the Package Manager window, under the Advanced menu select Show preview packages:
Then, search for “Terrain Tools” and press Install:
Consider installing the free complimentary Terrain Tools Sample Asset Pack by Unity Technologies from the Asset Store by selecting Add to My Assets:
From Window » Package Manager, select My Assets from the menu to search for Terrain Tools and press Import:
Now back in Unity with everything installed, there’s a new Terrain option under the Window menu.
Select Window » Terrain » Terrain Toolbox:
This will open a Terrain Toolbox window - change any settings and press Create:
The terrain has been created in Unity:
From the Hierarchy, select the terrain under the TerrainGroup to begin editing the terrain.
In the Inspector, under Terrain
- Select Paint Terrain
- Chose Raise or Lower Terrain
- Under Brush Mask, select a brush
- Under Stroke, set Brush Strength and Brush Size
- In the scene, left-click to raise elevation; or, CONTRORL left-click to lower elevation