Add a 3D Gizmo NODE

[timpni]

Hello!
I am developing a game where users can add, remove and move 3D objects, similar to what is possible in an editor. I have created a basic 3D gizmo, but since Godot already includes a 3D Gizmo in the editor, I thought it might be more efficient to turn that into a Node.

Best,
timpni

[Calinou]

Exposing the built-in 3D gizmos to projects would mean increasing their development surface a lot, as we'd have to do things like:

• Adding many features to it to ensure it fits everyone's use cases.
• Ensuring compatibility (and even visuals) don't change across versions, to preserve compatibility with exiting projects.

On top of that, exposing them would also increase export templates' binary size (not by a huge amount, but still).

Considering this, I don't think it's a good approach.

If something like #7213 is implemented in a manner that allows for live editing, then gizmos would need to be accessible in a running project, but they could still be compiled in debug builds only.