To smooth the height of the terrain, click the Terrain Smooth Brush 
tool or click Terrains > Terrain Smooth Brush in the main menu.
In the scene, click the terrain to smooth the terrain height. Click and hold to continuously smooth the terrain. You can change brush options such as brush size or strength in the Terrain Smooth Brush tool options 
.
Tool options
The Terrain Smooth Brush tool options include the following:
| Terrain Smooth Brush | |
Brush Size (m) | The brush size in meters defining the radius in which the terrain height is adjusted. |
| Strength (%) | Determines the amount the terrain surface is smoothed, ranging from no smoothing (0%) to strong smoothing (100%). |
| Continuous Smoothing | When you turn on the toggle button, the terrain is smoothed continuously as you click and hold. Otherwise, the terrain is smoothed only once. |