Godot 3D transform insert key

tool
extends Spatial

export(bool) var capture_transform : = false
export(NodePath) var animation_player


func _ready():
    set_process(true)
    pass # Replace with function body.

func loop_through_children(node):
    for child in node.get_children():
        if child.get_child_count() > 0:
            add_transform_tracks(child)
            loop_through_children(child)
        else:
            add_transform_tracks(child)


func add_transform_tracks(node):
    if animation_player.is_empty():
        return
    var anim_player = get_node(animation_player)
    if not(anim_player is AnimationPlayer):
        return
    var current_anim_position = anim_player.get_current_animation_position()
    var path = self.get_path_to(node)
    var current_anim = anim_player.get_animation(anim_player.get_assigned_animation())

    var track_idx : int

    track_idx = current_anim.find_track(NodePath(str(path) + ":translation"))
    if track_idx == -1:
        current_anim.add_track(Animation.TYPE_VALUE)
        current_anim.track_set_path(current_anim.get_track_count() - 1, NodePath(str(path) + ":translation"))
        track_idx = current_anim.get_track_count() - 1
    current_anim.track_insert_key(track_idx, current_anim_position, get_node(path).get("translation"))

    track_idx = current_anim.find_track(NodePath(str(path) + ":rotation_degrees"))
    if track_idx == -1:
        current_anim.add_track(Animation.TYPE_VALUE)
        current_anim.track_set_path(current_anim.get_track_count() - 1, NodePath(str(path) +":rotation_degrees"))
        track_idx = current_anim.get_track_count() - 1
    current_anim.track_insert_key(track_idx, current_anim_position, get_node(path).get("rotation_degrees"))

    track_idx = current_anim.find_track(NodePath(str(path) + ":scale"))
    if track_idx == -1:
        current_anim.add_track(Animation.TYPE_VALUE)
        current_anim.track_set_path(current_anim.get_track_count() - 1, NodePath(str(path) + ":scale"))
        track_idx = current_anim.get_track_count() - 1
    current_anim.track_insert_key(track_idx, current_anim_position, get_node(path).get("scale"))
    print("ins, idx : " + str(track_idx) + " node : " + str(get_node(path)))

func _process(delta):
    if capture_transform:
        add_transform_tracks(self)
        loop_through_children(self)
        capture_transform = false