Camera Moving, Scene UI persistence

[Deeeds]

I'm wanting to drop touch indicators onto the Scene UI.

However... my camera moves around a world much bigger than the original screen scene position. Outside of that initial screen scene position, the Scene UI elements detecting touch can't pop something on the Scene UI in Scene UI coordinates.

How do I do this:

Camera has moved a long way from "home".

Use touches screen, a touch icon drops onto the Scene UI, and persists in that screen position. Not world position.