Provide example in 3D

[GeorgeS2019]

https://github.com/godotengine/godot-demo-projects/tree/master/viewport/gui_in_3d

[gamedevserj]

The project you mentioned has some issues in 4.2
godotengine/godot#66247 (comment)

That being said I'm not sure this is going to be compatible with the current system. It looks like a good thing to have and I'll check how it might be implemented after the issue is solved, but for now support for 3D menus is not planned.

[GeorgeS2019]

@gamedevserj
The issue is referring to a specific part.
The challenge for you is to learn how to display 2D GUI in 3D environment using viewport, in way has not attempted before using c#

This will be game changing if you can show it - even with simple GUI

[gamedevserj]

The 3D functionality is added, explanation how to do it is in readme.