5.3.1: canvas doesn't process mouse events on part of the screen (full screen + multi-monitor)

I just filed bug #755480 for a bug with full screen mode in a multi-monitor setup. Parts of the canvas stop responding to mouse events, based on the *other* monitor's resolution. It's related to the regression introduced in 5.3.0, which it appears wasn't completely fixed in 5.3.1.

I have a Win10 computer with two monitors. Left one is rotated (effective resolution 1080x1920) while right one is standard (1920x1080). Windows identifies right one as #1, left one as #2.

Problems:

1. When I start the game in full screen mode, the resolution picker incorrectly identifies the *left* one as the default ("display 1") and starts the game there.

2. Much bigger problem: if I start the game on the right display (called "display 2" by unity), canvas UI covers the entire 1920x1080 screen, but only responds to mouse events on the left half of the screen. Specifically, it only responds to mouse events with x < 1080. Events at x>1080 don't seem to get processed at all.

As far as I can tell, the only option for the user is to run in windowed mode, because half of the screen is not responsive to mouse clicks.

(I *think* the culprit is that Unity incorrectly identifies the right display as #2, while Windows identifies it as #1, and they get confused about what is its actual resolution.)

 

Thank you for the fast response! So is there any way to bypass this multi display system and restore how the game used to work in 5.2? I'm afraid that players might run into this in the wild.

 

5.3.1 is out now so you can update and it will be fine.

 

So i'm checking into something as they might not have fully disabled the multiscreen stuff which could effect the mouse position

EDIT: yea one part wasn't turned off that we forgot was added. If you need a fix before early in the new year i'd recommend grabbing the source and implementing the fix yourself.

FIX for those who care:
So in GraphicRaycaster.cs there is a couple lines related to multi screen within the Raycast function. If you grab the 5.2 version of that whole class you should be ok. The other option is to just replace those lines with "pos = new Vector2(eventData.position.x / Screen.width, eventData.position.y / Screen.height);" if you feel more comfortable.

 

I see, line 85 in GraphicRaycaster.cs - thank you! Just the tip I was looking for!

https://bitbucket.org/Unity-Technol...GraphicRaycaster.cs?diff2=5e765793e9b5&at=5.3

 

Awesome, thank you!

 

Hi,

I'm having trouble with Canvas raycasting in Unity 5.4 - should this be fixed in this version? My game changes which display the canvas is drawn to during runtime. Although the canvas is drawing fine the click events are not, it almost looks like it's reacting to click events in the wrong screen size.

Thanks!

 

Ok that's fair enough. Is it on the roadmap to be fixed and any idea when that could be?

 

Also, just to confirm what is considered the "Primary Display"? I seem to get some confusing outcomes when running -multidisplay. Is the primary the display that started up Unity or what Windows considers monitor identity 1 (in Display Properties)?

I seem to get the impression that it's what Windows identifies as 1 - this is an issue as Windows doesn't let you change this from what I can tell.

 

I've run into this bug as well. A game seems to want to start on logical display #1, even when #1 is not set in Windows as the main display. And I believe you're correct, Windows doesn't let you renumber them.

This started happening with the (now disabled) multi-display code, ~5.2 or so.

Also I don't think there's a way to detect if you're displaying on the wrong monitor from inside the application, so you could at least give the player a hint to manually move the game to the other monitor...?

 

@karl.jones Hi Karl, are you aware if there is any update on the issue with the primary monitor bug? Or perhaps a ETA when a fix is likely to be?

Thanks!

 

Amazing! I'll look out for it. Hopefully this fixes the issues I'm having.

Thank you.

 

Should this be working in 5.6?

thanks!

 

They claim it does for windows standalone, but I have not been able to get it working. I finally posted a test project showing issues for them to reproduce with. I am waiting for a response.

https://forum.unity3d.com/threads/5-3-multi-display-feature-issues.372604/page-3#post-3019587