Migration Notes Godot 2 => Godot 3

Migration.md

This Gist was moved into its own Repository at https://github.com/dploeger/godot-migrationnotes

Please fork that repository and send pull request for updates. Thanks!

Moar notes (6+ months old, but anyway): https://hastebin.com/soxarekito.pl

Thanks, I've updated some things but don't know, how up to date many of the notes are now.

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Might want to mention that direct property access/modification is a thing now, as opposed to using setters & getters (unless there's no corresponding property for them, of course).

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Another new thing: you can modify the properties of core classes independently for example when using a tween or as an animation track. For example, if you want to tween only the x position of a sprite you can do:
$Tween.interpolate_property(self, "position:x", position.x, position.x + 100, 2, Tween.TRANS_LINEAR, Tween.EASE_IN)

More info here godotengine/godot#12284

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Thanks, everybody. I've updated the gist.

According to godotengine/godot#15374 (comment)

create or create_from_data() must be called after Image.new()

2.1 :

var img = Image.new()
img.lock()
img.set_pixel(x, y, color) # Works
img.unlock()

3.0

var img = Image.new()
img.create(1, 1, false, Image.FORMAT_RGBA8)
img.lock()
img.set_pixel(x, y, color) # Works
img.unlock()