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I wanted to know what does happen to the old scene when we change to a new scene?

in Engine by (695 points)
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1 Answer

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I wrote an extensive answer to this in an older question, and how it relates to singletons: https://godotengine.org/qa/41523/how-to-keep-all-choice-in-one-scene-to-other-scene

Godot 3 (and 2) games run in a single scene tree, for which the root is a Viewport (the screen).
Your current scene is simply instanced as child of the root node. Singletons nodes (auto-loads) are instanced as siblings of the current scene, which is why they remain available.

When you use change_scene(), Godot essentially removes the node containing your current scene, and replaces it with the next one.

Put simplified, in script terms:

var current_scene = root.get_node("MyCurrentScene")
current_scene.queue_free()
root.add_child(next_scene.instance())
by (29,510 points)
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