When looking directly down at a scene with an ArcRotateCamera with panningAxis [1,0, 1] you can’t pan vertically anymore.
Let me take a look!
Check out the paragraph below the arcrotatecamera image Camera Introduction | Babylon.js Documentation
Yeah but you even get this problem when a user manually adjusts the camera until beta = 0. And even before hitting 0, you notice that camera starts panning more slowly as you approach beta = 0.
There are workarounds for this problem because this isn’t an issue with other orbital camera implementations.
This is still on my radar. I’m a bit busy atm but I’ll find a fix soon.