Scene View camera receives small input values even when editor is not focussed

[hybridherbst]

Describe the bug
When focussing away from the editor, the scene view moves ever so slightly, to the point that when focussing the editor again after ~30 minutes the camera is somewhere totally else.
While I generally like that functionality (using the space mouse while editor is in the background) it should be optional, and I think the slow "drift" is a bug nonetheless.

To Reproduce
Steps to reproduce the behavior:

1. install package
2. click into scene view
3. focus another window
4. note that scene view moves slightly
5. wait for 30 min
6. focus Unity
7. note that scene view has wandered off

Expected behavior

1. no wandering off
2. moving the scene view camera when Unity is not focussed should be optional (and off by default)

Desktop (please complete the following information):

• OS: [e.g. Windows, MacOS]
• SpaceNavigator Driver version [e.g. 2.0.0-beta.7]

[PatHightree]

Thanks for the report, I've seen some drift now and then. Good to know it builds up over time

[PatHightree]

Unmistakably seeing this issue now on U2021.2.0b3, never saw it like this on U2020.3.3f1 and earlier.
What Unity version did you see it on ?

[hybridherbst]

It's also there on 2020.3, but much slower; in 2021.2 the degradation is pretty rapid.

[bikusta]

Hi. I can confirm the issue. Just installed driver version 2.0.0-beta.7 from Git in Unity 2020.3.25f on Windows 10. The scene view is moving constantly, when focused or not.

Video showing the movement:
https://youtu.be/J_x5xuZRAW8

[mkoehmst]

Could the problem be the lack of a deadzone? Maybe previous version were doing some kind of automatic smoothing that would zero out very small translations. A deadzone customization in the SpaceNavigator options window could be useful for this. I'm experiencing constant drift as well with a SpaceNavigator.

[fpga68k]

I also noticed the missing (re-)calibration and that there is no sufficient dead zone. The fix from @bikusta works well for the dead zone. Thanks!

[PatHightree]

Thanks @bikusta for the fix, I merged it into /main.
I changed the epsilon settings to deadzone sliders for clarity.