how to add a black fade in?

SuperGibaLogan

is there like a tutorial for that? just a black fade in, nothing much

xyz

SuperGibaLogan Put a black ColorRect node over everything and tween its color.a

DaveTheCoder

Here's a similar example (Godot 4), where transition is a Sprite2D, and its modulate property's alpha channel is tweened from 1.0 to 0.0 over half a second.

var tween: Tween = create_tween()
tween.tween_property(transition, "modulate:a", 0.0, 0.5).from(1.0)
await tween.finished

Tomcat

If combining both tips above, here is the code that darkens the screen and terminates the program in a second and a half:

# Exit by ESC.
	if event is InputEventKey:
		if event.pressed and event.keycode == KEY_ESCAPE:
			var screen_size
			screen_size = get_viewport_rect().size
			$ColorRect.size = screen_size
			$ColorRect.show()
			var tween: Tween = create_tween()
			tween.tween_property($ColorRect, "modulate:a", 1.0, 1.5).from(0.0)
			await tween.finished
			get_tree().quit()