new terrain plugin

addons/terrain_3d/README.md

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+![Terrain3D Logo](/doc/docs/images/terrain3d.jpg)
+
+# Terrain3D
+A high performance, editable terrain system for Godot 4.
+
+
+## Features
+* Written in C++ as a GDExtension addon, which works with official builds of Godot Engine
+* [Can be accessed](https://terrain3d.readthedocs.io/en/stable/docs/programming_languages.html) by GDScript, C#, and any language Godot supports
+* Terrains as small as 64x64m up to 65.5x65.5km (4295km^2) in non-contiguous and variable sized regions
+* Up to 32 textures
+* Up to 10 levels of detail for the terrain mesh
+* Foliage instancing, with up to 10 levels of detail, and a shadow impostor
+* Sculpting, holes, texture painting, texture detiling, painting colors and wetness
+* Imports heightmaps from [HTerrain](https://github.com/Zylann/godot_heightmap_plugin/), Gaea, World Creator, World Machine, Unity, Unreal and any tool that can export a heightmap. See [heightmaps](https://terrain3d.readthedocs.io/en/stable/docs/heightmaps.html)
+
+
+## Games Using Terrain3D
+
+Please see the [featured games using Terrain3D](https://terrain3d.readthedocs.io/en/latest/docs/games.html) for examples of what it can do.
+
+
+## Getting Started
+
+1. Read the [Introduction](https://terrain3d.readthedocs.io/en/stable/docs/introduction.html) to understand how this terrain system works.
+
+2. Read the [Installation & Upgrade](https://terrain3d.readthedocs.io/en/stable/docs/installation.html) instructions.
+
+3. Watch the [tutorial videos](https://terrain3d.readthedocs.io/en/stable/docs/tutorial_videos.html) and read through the documentation.
+
+4. For support, read [Getting Help](https://terrain3d.readthedocs.io/en/stable/docs/getting_help.html) and join our [Discord server](https://tokisan.com/discord).
+
+
+## Credit
+Developed for the Godot community by:
+
+|||
+|--|--|
+| **Cory Petkovsek, Tokisan Games** | [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/twitter.png?raw=true" width="24"/>](https://twitter.com/TokisanGames) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/github.png?raw=true" width="24"/>](https://github.com/TokisanGames) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/www.png?raw=true" width="24"/>](https://tokisan.com/) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/discord.png?raw=true" width="24"/>](https://tokisan.com/discord) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/youtube.png?raw=true" width="24"/>](https://www.youtube.com/@TokisanGames)|
+| **Roope Palmroos, Outobugi Games** | [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/twitter.png?raw=true" width="24"/>](https://twitter.com/outobugi) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/github.png?raw=true" width="24"/>](https://github.com/outobugi) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/www.png?raw=true" width="24"/>](https://outobugi.com/) [<img src="https://github.com/dmhendricks/signature-social-icons/blob/master/icons/round-flat-filled/35px/youtube.png?raw=true" width="24"/>](https://www.youtube.com/@outobugi)|
+
+And the contribution team in [AUTHORS.md](https://terrain3d.readthedocs.io/en/stable/docs/authors.html) and on the right of the github page.
+
+
+## Contributing
+
+Please see [CONTRIBUTING.md](https://github.com/TokisanGames/Terrain3D/blob/main/CONTRIBUTING.md) if you would like to help make Terrain3D the best terrain system for Godot.
+
+
+## License
+
+This addon has been released under the [MIT License](https://github.com/TokisanGames/Terrain3D/blob/main/LICENSE.txt).