Terrain3D

Terrain3D is a terrain system for Godot 4, written in C++ as a GDExtension. Its repository describes terrains from 64 by 64 metres up to 65.5 by 65.5 kilometres.

It supports sculpting, holes, texture painting with up to 32 textures, painted colour and wetness, ten levels of detail for the terrain mesh, and instanced foliage with shadow impostors. It can be used from GDScript, C# and other languages Godot supports.

When a 3D world gets ground, whether the AI lays it or you shape it by hand, the result is a Terrain3D terrain in your project. The hills you raise and the ground you paint are Terrain3D data.

Because it is an ordinary Godot addon inside an ordinary Godot project, the terrain opens in the Godot editor too, with Terrain3D's own tools.