Chapter 5. World Space UI
"Iron Man 3" Marvel Studios, Paramount Pictures, 2013 (source http://www.geek.com/mobile/wearable-computing-is-back-google-reportedly-making-hud-glasses-1465399/)
Graphical user interface (GUI) or just UI, usually refers to on-screen two-dimensional graphics, which overlay the main gameplay and present information to the user with status messages, gauges, and input controls such as menus, buttons, sliders, and so on.
In Unity 5, UI elements always reside on a canvas. The Unity manual quotes the canvas component as the following:
The Canvas component represents the abstract space in which the UI is laid out and rendered. All ...
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