Hey, im relative new in godot and used a lot of unity before. I thought i try to make a simple game so i can see if i like it. But i googled for an hour now and found nothing about 3d ui.
I really like the simplicity on the UI system but is there no Node to interact (or just see) some kind of ui in 3D space? (sry if my english is not that good) 🙂

What kind of UI do you want to put in 3D? They added the label 3D for text which I use quite a lot. I don't believe there's a simple way to put other UI in a 3D space yet without projecting a 2D UI scene on a canvas onto a flat 3D mesh.

You talking about a 2D viewport in a 3D world space?
There's a demo for you to study if that's it.

Check this out,

  1. when you open Godot, it should open to a list of your projects.

  2. At the top is two tabs. "Local Projects" and "Asset Library Projects"

  3. Click on the second one, "Asset Library Projects", let it load, and there should be a search bar just below the tabs mentioned before.

  4. Enter "2D in 3D" and click the (probably) only result, "2D in 3D Demo", and from there the steps are just like creating a new project.

  5. If you did it right, you should have a Pong game playing on a block in 3D space.

  6. It's just a matter of figuring out what you're looking at from there.
    It may take a while.
    It took me all day.

I've heard it's way more intuitive in Unity, so good luck dude. Things get a little weird in FOSSland.

I would use colliders and 3D sprites, it is entirely possible to make a 3D GUI in Godot, it's just a matter of making sure after that the raycasts are hitting the 3D sprites accurately.

Tomcat Unfortunately, it is still only for 3.5.

No it's not 🙂. Demos have been partially made compatible with 4.0, I've tested the 2D_in_3D/gui_in_3d demos and they are working (100% sure with RC2).
See PR 782