VisibilityNotifier is commonly used when you wish to activate or deactivate certain nodes when they come into view. An example of this may be to disable bullets when they leave the screen. By manipulating the VisibilityNotifier size, you can make it signal a while before entering the screen, or a while after the screen – so that you wont see half a bullet, ball or object disappear before truly having left the screen.
In this video, I will demonstrate how you can use the VisibilityNotifier2D node. What we are doing in this video can also be done using the 3D version of the node; “VisibilityNotifier”.