Скачать или смотреть Unity Runtime Terrain Editor

Allows you to modify the terrain in runtime with a simple view, using unity ui and terrain api.

Unity Terrain is a great tool but in runtime we don't have a built-in solution to modify the terrain.

This package is a simple terrain editor works in runtime(play mode), built with unity ui components and Terrain API.

Features

RTS camera movement
Raise, lower, flatten, smooth, paint, object placement modes
Undo/Redo
Map size options
Example brush, paint and objects provided
Easy to use/modify, Scriptable Object based settings file
Limitations

This is not a complete solution for a level editor. It aims to demostrate runtime capabilities of terrain with simple controls.
Works for only a single terrain. Multiple terrains are not supported.

Available on Asset Store
https://u3d.as/2QtV

Also, I used this project as a base to create my own sandbox application, Map Sandbox.
https://cemuka.itch.io/map-sandbox