Today i found in
gamedata/effects.scd shader file
sky.fx. There are some values from procedural skybox that I didn't know what they are. After some trials i finally get all values exactly and code how they are used in game. Only MidRgbColor and Clouds7 values are unknown, but they are always 0.
I can now in Unity change skybox size, shape, position, colors, sun, planets and also color and animation of clouds. Will be great to make tools for that in future. Right now I will leave it and if someone expirienced want to play with them, then you can get Unity Editor and Map Editor source code and do what you want. You can also do it without Unity Editor in next build: Export skybox to file, edit in notepad and then import it again.
Here is the code for reading and saving skybox bytes:
https://github.com/ozonexo3/FAForeverMa ... boxData.cs