Bug Cannot interact with UI on second display with new Input System

I've just created a very default scene with a canvas and a button on it. Then I added another camera, and another canvas with a button on it, and set that to target Display 2.

I can interact with the buttons while in the Editor. I.e. I select Display 1, and I can interact with the button on that display, and then I can select Display 2, and I can interact with the button on that display.

However, when I build the application and run it, I see both displays with their own button on, but I cannot interact with the button on the 2nd display.

I've tried this on 2021.3.0f1 and 2021.3.8f1 without success.

It did work on 2020.3.32f1

 

Hi, we have the same issue here (on 2021.3.13f1), have you found a solution since your post ?

 

Hi. Apologies for the slow response. No, I haven't, so I did log it as a bug with Unity. They have since reviewed it and confirmed it as being a bug: IN-17801.

To date, it hasn't been resolved.

 

I have the same problem in 2022.2.16. I've unsuccessfully tried to find the bug report you mentioned, do you have a link to it by any chance?

 

Hi Magnus,

Here it is:

Bug Case: UUM-19320
Issue Tracker link: https://issuetracker.unity3d.com/is...work-on-display-2-when-using-new-input-system

 

Thank you! May I ask how you worked around the issue?

 

We didn't. We've been forced to stay on Unity 2020.3 because of it. The one workaround is to migrate back to the old input system, but there were a few issues there. Off the top of my head, particularly w.r.t touch input and Unity's UI system. Just an update though, as of recently, this bug has now been logged with Unity's Technical Support from an Enterprise User so, fingers crossed, it should get resolved shortly.

 

Thanks for the update! I can confirm that it works as expected in the last beta version (2023.1.0b14), hopefully the fix can trickle down to the more stable versions as well soon enough.

 

Aaah, thanks for that feedback. That is great to know!

 

Hi everybody, I run into this issue with a VR project. I tested with the 2023.1.0b16 editor version, and the UI on the second screen only works if the headset (Quest 2 via Link) is not connected to the PC. As soon as I start the build with the hedaset connected, the UI can't register any event. I only need a button and a scroll view but I can't interact any of them.

Is there any idea or workaround for this?

 

I have a similar issue, using VR. OpenXR depends on the new input system, which means it's not possible to switch to the old input manager as workaround.
Are there other possible workarounds?

 

I have received recent feedback from Unity that the bug is still not fixed, but there is a possible workaround that they're going to try test out. I'll post the solution if it does work out and they forward the workaround to me.

 

Same answer as to andorfy: I have received recent feedback from Unity that the bug is still not fixed, but there is a possible workaround that they're going to try test out. I'll post the solution if it does work out and they forward the workaround to me.

 

@andorfy @Flavelius @magnusfox @Olivier-Tache :

Finally have a workaround, received from Unity. I've done it myself and it works in both Unity 2021.3.26f1 & 2022.3.1f1.

The workaround requires replacing the Graphic Raycaster component in every Canvas with the CustomGraphicRaycaster.cs script (attached). This script is using the display index information that is now returned in the last version of the New Input Package, so, the project also requires to be in the last version of the New Input System.

NB! The New Input System MUST be v1.6.1 (or higher in the future I assume).

 

Good news! The problem is not present in the latest LTS (2022.3.2f0).

 

Great! Will upgrade my Unity Editor soon then to this...

 

The issue is still present in 2022.3.8f1 (input system package 1.6.3), but the custom raycaster above indeed functions as a workaround for now. Thanks

 

And to update, the custom raycaster only works in editor, but not in build (22.3.8f1), so it's still very much an issue.
Test setup has 2 displays, same resolution or different resolution doesn't seem to make a difference.

 

Hi, does anyone have any update? It's a huge problem for our project

 

it still doesn't work in the latest versions

 

Does this work on Linux? In Unity hub I can select 2022.3.22f1 and 2023.2.15f1

If it’s fixed in Linux can I use one of these two?

 

It really seems to work now. Finally, thanks!

 

Doesn't work on Linux. Using 2023.2.15f1 does have a different result to the older 2021, 2021 showed presses on screen 1 as buttons pressed on screen 2, if you hit the corresponding position. However 2023.2.15f1 hitting screen 1 has not effect on screen 2.
I've also added the new CustomGraphicRaycaster.cs but no luck.

Can anyone advise? Thanks

 

There's still an issue when using VR worldspace canvas input. There seems to be code that uses
Display.activeEditorGameViewTarget to (in this case incorrectly) set the display value which then cancels out the VR-Canvas raycaster logic depending on where the PC-Cursor last clicked. VR input uses a controller-attached invisible camera as event source, which seems to be the common way to do this (it worked in the past, pre 2022 (2 displays, PC+VR input)). Now this PC-display filtering interferes with the VR worldspace canvas input.
A partial workaround is to force the invisible vr interaction camera's targetdisplay & the eventdata's targetdisplay value to the one of the current pc cursor's display. This makes it atleast work in builds.