make panel pass raycasts, but still respond to onDrag

hi there!

in my 3d project for mobile decives, i have a ui panel stretched over the entire screen, which allows the player to drag on it to turn the character around.

now i also want to make objects in the world clickable (imagine just like in minecraft).
so this is what i did:
- i attached a new script to a gameobject
- in this script i added a IPointerClickHandler, to do something when it is clicked
- i added a Physics Raycaster to the main camera (which is obviously behind the panel i use for looking around)

so the problem now is, that i cant actually click on objects, because the panel blocks all the raycasting coming from the camera.
when i remove the panel, it works fine.
when i add a Canvas Group to the panel and disable "blocks raycasts", i can click on gameobjects through the panel, but the dragging on the panel doesnt work anymore.

what can i do?
any ideas?
thanks in advance!!

 

The panel shouldn't block raycasts. the only reason it could block is if you have a CanvasGroup with "Block Raycasts" turned on.

Raycasts pas complete through the screen unless blocked by a CanvasGroup by default

 

yes, but i need the panel to recieve the raycasts, otherwise i cant use it for rotating my character by onDrag.

at this point, im pretty sure that its a stupid idea to stretch a panel over the entire screen since i also want to click on gameobjects in the world. a panel just blocks everything behind it.
i think i have to capture drag movements from the eventsystem directly in order to make the character rotate when the player drags over the screen. unfortunately, i have no idea how to do that.
while testing my game, i can see that in the inspector for eventsystem, touches are registered even when they are not on an ui element.
anybody any idea how to get these informations for my scripts??

 

Correct, the input system validates all raycasts in the scene, the event system only evaluates those within the RectTransform of the canvas however. You can see this in the UI source:
https://bitbucket.org/Unity-Technol.../InputModules/StandaloneInputModule.cs?at=4.6

But if you want the drag operation to work on the entire screen, then yes you panel will have to fill the screen.