A naive raycast problem solution for people who are tired enough.

*Notice. it may not fit with you're case. i'm not a unity guy who has responsible for write right code for everyone. but you could get a idea from my solution. And sorry about my poor grammar, I'm not a native.

First of all, I'm tired with waiting a patch to solve this. This raycaster problem is existed since the first version of unity 5 until now. And It was too painful to hard-code workarounds case-by-case. So i finally open the ugui project which is open project at bitbucket. I changed just a line of code, and it worked nicely.

0. I used 5.2.0 version for this solution. go get a project at here
https://bitbucket.org/Unity-Technologies/ui/downloads

1. GraphicRaycaster.cs Line 181.

Code (csharp):

1.  
2. sortingLayer =  canvas.cachedSortingLayerValue,
3.  

Change this code to

Code (csharp):

1.  
2. sortingLayer =  canvas.sortingLayerID,
3.  

this.

And you're done. Just build dlls and put its in a installation folder as instructed here.
A line of code change will resolve most of raycaster issue.
https://bitbucket.org/Unity-Technologies/ui/overview

ps1. in my view, the evil of root for this problem is EventSystem.RaycastComparer() and Raycasters. if you face another raycast problems, take a look those classes.
ps2. if you're facing a compile problem at editor when you try to bulid, restart your editor it'd resolve many issues.

 

according to my repo tracking this exact fix was done in 5.2.1p1

 

thanks for your info. and please make a good patch note next time since i couldn't find any note about it.

 

Wasn't me who added it so not sure why it wasn't included in the patch notes.

 

Which issue exactly is this about? I'm in 5.2.1.f1 and still having issues with raycasters when used with world-space canvases and perspective cameras. I submitted a bug report with code to fix the issue (raycasters using Raycast instead of GetRayIntersection) a few weeks ago, but it was never turned into an Issue.

 

it's about when you use multi canvases with multi sorting layers.