I do not manage to enter the callbacks when i set observables for the Slider3D objects : https://www.babylonjs-playground.com/#IFDI9M#5
Slider3D information is missing in the GUI3D documentation but the class says it inherits Control3D, so I guess I could use these values… ?
Thank you guys
Hello again,
I’m sorry I couldn’t answer your other question on the 3D GUI Slider. But I think I can at least help with this one and this rev of your PG. Hope this helps,
You are right, I noticed that onValueChangedObservable is the only one working here.
But I really need the onPointerDown to work because I want some operations to be done only once.
Ouch! I’m afraid that for this one you will probably need to implement yourself for the 3D slider (as far as I know). Or you could extend the function with a var recording the first interaction and value change with the slider and next remove the observable (that would be easy and would work, I believe)
Else, just allow some time for may be @sebavan to reply and confirm (or give you the solution that works automagically 
for it). Meanwhile, you can cross fingers hoping this solution exists.
It’s holiday period so replies from the team and experts might just take a little bit more time than usual.
Meanwhile, have a great day 
I ll see if it is easy to fix or by design when I ll fix this one tonight: GUI3D : Slider3D isVisible boolean not working
Will be fixed by Fix 3D slider observables and visibility by sebavan · Pull Request #12759 · BabylonJS/Babylon.js · GitHub
Wow @Boz (with your discoveries) and then @sebavan (with your instant fixes)… In a couple of posts you two sure helped improving the 3D GUI.
Amazing stuff. I luv it 
It should be working now thanks to @sebavan 
quick response and dedication as always. Keep it up ! Thanks