Add document form `Terrain3DEditor.set_brush_data`

[CsloudX]

Description

I want to modify the terrain in real-time during runtime, such as building roads, setting roughness, and so on. The code generated demo in the routine still does not meet my requirements. But Terrain3D itself is definitely capable of meeting the requirements. I searched for relevant information and found that Terrain3DEditor is very suitable and should also be supported for running. My problem now is that I don't know which parameters and related requirements are supported by Terrain3DEditor. set_bush_data. I hope to add relevant explanations in the document. `Terrain3D fills the pain point of Godot's lack of terrain, and I really love Terrain3D. Thank you very much, author.

[TokisanGames]

Terrain3D is capable of editing nearly all data at runtime via the Data API, which already is fully documented. You want to set roughness, call data.set_roughness(). Read the docs to learn how and when to update after modifications.

Terrain3DEditor is very suitable and should also be supported for running

It is. There's at least one group using it. But you should not use Terrain3DEditor unless you are creating an in-game hand editor. Making a hand editor is not trivial.

I don't know which parameters and related requirements are supported by Terrain3DEditor. set_bush_data

If you are making a hand editor, then you need to look through and understand our editor_plugin.gd and derivative scripts for our hand editor. The GDScript shows how to use the C++ Terrain3DEditor API. The parameters are created in GDScript and processed in C++. Both show the list of all parameters and how they are used.

The code generated demo in the routine still does not meet my requirements

Yes, it's just an example. You're supposed to build your own systems.