Unity 2017.1 p4 - Unity Screen-space camera canvas - Graphics Raycaster fails

Questions & Answers
1

Hello there.

Recently upgraded from Unity 5.5.1.f1 to Unity 2017.1p4. Popups in our game which are drawn on a screen-space camera canvas now don’t respond to any input.

I’ve forked the latest GraphicsRaycaster code from bitbucket(5.6) and ran with that so I could debug it. The line it fails on is:
if(!RectTransformUtility.RectangleContainsScreenPoint(graphic.rectTransform, pointerPosition, eventCamera))
continue;

Has there been any recent changes to that function which would break previous versions? It points to native code so sadly I can’t see what it’s actually doing, but with a name like that, I don’t see how it could fail to do what it says.

The only thing I can think of, is as the UI that doesn’t respond is instantiated, maybe the canvas elements transforms are not being properly re-calculated? (They look fine when inspecting the graphic.rectTransform property).

I’ve made no other changes other than the upgrade, has there been any similar problems reported post 5.5.1f1?

Thanks

2

Ok I found the error. Unity 5.5.1f1 seemed to be ok with a z scale of 0 for this calculation. Newer versions are not.

I modified our animations to make Z scale 1 and it works.