How can I invert (mirror/flip) a sprite by event sheet? The only way that I've found was linking on the sprite angle via properties panel. But I want to mirror the sprite independently of its angle.
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You can't right now - you can always manually flip the image in the animations editor, or use a hidden "real" object for the player and just position the player on top, using the angle to flip the object.
Changing the animation is probably the best way.