Question

How can a condition be tracked in every frame and if it is true, then perform an action once?

example:

func _process(delta):
    if something:
        print(true)
    else: return

This code will output each frame "true" if the condition is true.

How to make sure that "true" is displayed once when the condition is true?

Answer 1

Add a variable to your script to track the "once" state:

var once = false

func _process(delta):
    if something and not once:
        print(true)
        once = true