[PROBLEM SOLVED]
Hi!
I created the 'ObjectControls' module for ThreeJS that allows you to rotate a single OBJECT (or a Group), and not the SCENE.
You can find here a live demo https://alberto-.github.io/threeJS-object-controls/https://albertopiras.github.io/threeJS-object-controls/
Here the repo https://github.com/Alberto-/threeJS-object-controls.https://github.com/albertopiras/threeJS-object-controls
It's very simple to use,
Hope this helps :)
Bye
Alberto