Why does AnimationTree playback.travel() do nothing?

AnimationTree.active must be true. tree_root must be assigned to a state machine. State name passed to travel() must exactly match a node name in the state machine.

How do I get the playback handle?

playback = anim_tree.get('parameters/playback'). The path follows the parameter route to the StateMachine node in the tree.

travel vs start vs next?

travel finds shortest path through transitions; start jumps directly bypassing rules; next advances along defined transitions. Pick by intent.

Fix: Godot AnimationTree travel() Does Nothing

Quick answer: anim_tree.active = true. Get playback via parameter path. Pass exact state node name to travel().

You call travel("run"). Stays on idle. AnimationTree is inactive, or "run" doesn’t match the state node name (case-sensitive).

The Fix

extends CharacterBody2D
@onready var anim_tree: AnimationTree = $AnimationTree

func _ready():
    anim_tree.active = true   # required

func _physics_process(_d):
    var playback = anim_tree["parameters/playback"] as AnimationNodeStateMachinePlayback
    if velocity.length() > 10:
        playback.travel("Run")   # exact node name
    else:
        playback.travel("Idle")

Active flag turns evaluation on. Parameter path locates the playback. State names are case-sensitive matches against the StateMachine’s node names.

Verifying

Move character. State swaps as expected. AnimationTree visualizer shows current state highlighted.

“Active true. Path right. Names exact. Travel.”

Related Issues

For Skeleton3D bone, see bone modifier. For tween signal, see tween signal.

Active. Path. Name. State changes.