Input behind 3d

Questions & Answers
1

What I have going on in one particular part of this project is:

  • a 3d model with a couple of world canvases that each have a button
  • an overlay canvas with more general UI which includes a top bar and a floating button

I want to be detect if the user clicked somewhere outside of either the overlay canvas’ elements, and the world canvases. “In the background”, in other words.

How do I do this? Do I have to do this with another world canvas behind the 3d model? What I worry about there is that the user can rotate the camera around the model, so I’d have to reposition that particular canvas whenever the camera moves.

Can I achieve this with a second camera somehow? (And if I have to do so with a world canvas, how do I make sure the world canvas takes up the whole of the camera’s viewport?)

Note, I don’t need to render anything for this background area - I just want to know if there was otherwise untrapped input.

2

Maybe create an overlay canvas in your hierarchy beneath the other canvases? I would then create a clear overalay button spanning the screen that would detect if I clicked on that canvas, but because it’s last in the hierarchy, it’s OnClick function would only be initiated if there were no other canvas on top of it.

3

That’s true, but so far as I understand it, ALL overlay canvases are placed on top of the 3d scene, and the world space canvases will be in that 3d space.