Graphic Raycasting doesnt work on all children canvases

Questions & Answers
1

I have an Inventory system with Slots in it. All the Slots are children of Slotholder which has a Graphic Raycast component. I use this component in a child GameObject of the Slot, which is called TriggerEvent to capture events to move stuff around the inventory. Now i wanted to add a tooltip which i can close by clicking anywhere on the screen. To do that i added a screenwide panel behind the tooltip window that will play a role of a giant “button”. And again, to capture clicks i added new script with IPointerDownHandler which disables the window. In Unity documentation i read that it is enough to have Graphic Raycast on the root object in order to capture all the events below. Which doesnt happen. I need to add to that giant “button” another Raycast component, which is ridiculous considering that i have 100 slots.

This is what TriggerEvent has:

  • Rect Transform
  • Canvas Renderer
  • Image (blank with Raycast Target checked)
  • Script with all the interfaces

This is what PaneltoCloseToolTip has:

  • Rect Transform
  • Canvas Renderer
  • Image (blank with Raycast Target checked)
  • Script with the interface IPointerDownHandler
  • Canvas
  • and to make it work > Graphics Raycaster

Position in the Hierarchy:

  • Slotholder(With Graphic
    Raycaster)>Slot>Tooltip(blank
    GO)>PaneltoCloseToolTip(also with
    With Graphic Raycaster)
  • Slotholder(With Graphic
    Raycaster)>Slot>TriggerEvent

What am i doing wrong?

2

could someone at least specify if it is ok to have 100 raycasters if noone knows the answer?

3

If I understood right, your gameobject that doesn’t register input has it’s own canvas, in which case it does indeed need graphics raycaster. Canvas and graphics raycaster go hand in hand. You are also saying you have hundreds of these objects, so it sounds like you need to remove these canvases, and have canvas + graphics raycaster in a parent object, to handle the childrens. Having several Canvases is fine and good, but a hundred sounds like too much.