‘Raycast Target’ enabled by default on Image/Text

[ortin]

So I found this link accidentally

Optimizing Unity UI - Unity Learn

with this “cool” part:

Given that all Raycast Targets must be tested by the Graphic Raycaster,it is a best practice to only enable the ‘Raycast Target’ setting on UI components that must receive pointer events. The smaller the list of Raycast Targets,and the shallower the hierarchy that must be traversed,the faster each Raycast test will be.

So simple question to Unity devs: why on earth it’s enabled by default on Image/Text if it contradicts your own “best practices”?!

[wlwl2]

There is an additional problem if it is on/checked by default which is that it interferes with OnPointerEnterDelegate() (UnityEngine.EventSystems). Basically, if your mouse is hovered over buttons with any images overlapping them, it causes a problem when you have to hover more than expected to select the button. It took me a long time to figure out this bug existed (when it was right in front of me in so many buttons), and a long time to debug it, as UI is hard to debug compared to code.

I think that it is a good thing to enable by default only for interactables. Also, there is still no tooltip for it (and “Maskable”) now (2019.4).

I’m also not sure if a new UI system will fix this, I think they are working on upgrading Unity UI again.