Automates the setting of interpolation mode on AnimationPlayer tracks in Godot 4.2+

animation_player_interpolation.gd

extends AnimationPlayer

# HOW TO USE:
# Add this to an AnimationPlayer
# Make sure to set the interp mode on the node in the editor.
# 
# Make sure to also set the FPS on the animation import as well.
# If you want to animate on 2s then set the fps to 12 or 15 and
# set Interp Mode to NEAREST

const NEAREST: int = 0
const LINEAR: int = 1
const CUBIC: int = 2

# Pick an interpolation mode for all tracks
@export_enum('NEAREST', 'LINEAR', 'CUBIC') var interp_mode: int = NEAREST

func _ready() -> void:
	await owner.ready
	change_interpolation_mode()
	
func change_interpolation_mode() -> void:
	print("Interpolation Mode: ", interp_mode)
	
	# Finds every animation on the selected AnimationPlayer
	var anim_list = get_animation_list()
	print("Animations Found: " + str(anim_list))

	# Loops between every animation and apply the new interpolation mode
	for anim_name: String in anim_list:
		# Get the Animation by name
		var anim_track: Animation = get_animation(anim_name)
		
		# Get number of tracks (bones in your case)
		var count: int = anim_track.get_track_count()
		print("Modified Interpolation Mode " + anim_name)
		
		# Change interpolation mode for every track
		for index: int in count:
			anim_track.track_set_interpolation_type(index, interp_mode)