tween-animation

Tweens in Godot 4.3+

All examples target Godot 4.3+ with no deprecated APIs. GDScript is shown first, then C#.

Related skills: animation-system for AnimationPlayer/AnimationTree (keyframe-based), godot-ui for UI transitions, shader-basics for tweening shader parameters, camera-system for camera shake and transitions, math-essentials for easing curves and interpolation math, particles-vfx for code-driven VFX timing and sequencing.

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1. Core Concepts

Tween vs AnimationPlayer

Feature	Tween (code-driven)	AnimationPlayer (data-driven)
Setup	Code only — no editor needed	Animation panel with keyframes
Best for	Procedural motion, UI transitions, VFX	Complex multi-track, artist-driven clips
Reusability	Recreated per use — lightweight	Saved as resources, reusable across scenes
Blending	No — one tween per property at a time	Yes — AnimationTree supports blending
Method calls	tween_callback() at any point	Call Method tracks at keyframed times

Rule of thumb: Use Tweens for one-off procedural animations (fade in, bounce, slide). Use AnimationPlayer for repeating, artist-tuned animations (walk cycle, attack sequence).

Creating a Tween

Tweens are created from any Node and auto-bind to it. When the node is freed, the tween stops automatically.

# Creates a tween bound to this node
var tween := create_tween()
tween.tween_property(self, "position", Vector2(400, 300), 1.0)

var tween = CreateTween();
tween.TweenProperty(this, "position", new Vector2(400, 300), 1.0f);

Important: Each call to create_tween() creates a new tween. Previous tweens on the same property are not automatically killed — they compete. Kill old tweens before creating new ones on the same property if you don't want conflicts.

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2. Tweener Types

tween_property() — Animate any property

var tween := create_tween()
# Animate position over 0.5 seconds
tween.tween_property($Sprite2D, "position", Vector2(200, 100), 0.5)
# Animate modulate alpha (fade out)
tween.tween_property($Sprite2D, "modulate:a", 0.0, 0.3)

var tween = CreateTween();
tween.TweenProperty(GetNode("Sprite2D"), "position", new Vector2(200, 100), 0.5);
tween.TweenProperty(GetNode("Sprite2D"), "modulate:a", 0.0f, 0.3);

Sub-property access: Use : to target individual components — "position:x", "modulate:a", "scale:y".

tween_callback() — Call a method at a point in the sequence

var tween := create_tween()
tween.tween_property(self, "position", Vector2.ZERO, 0.5)
tween.tween_callback(func(): print("Arrived!"))
tween.tween_callback(queue_free)

var tween = CreateTween();
tween.TweenProperty(this, "position", Vector2.Zero, 0.5f);
tween.TweenCallback(Callable.From(() => GD.Print("Arrived!")));
tween.TweenCallback(Callable.From(QueueFree));

tween_interval() — Wait/delay between steps

var tween := create_tween()
tween.tween_property(self, "modulate:a", 0.0, 0.3)  # fade out
tween.tween_interval(1.0)                             # wait 1 second
tween.tween_property(self, "modulate:a", 1.0, 0.3)  # fade back in

var tween = CreateTween();
tween.TweenProperty(this, "modulate:a", 0.0f, 0.3);
tween.TweenInterval(1.0f);
tween.TweenProperty(this, "modulate:a", 1.0f, 0.3);

tween_method() — Animate a custom method with interpolated values

# Animate a method that receives interpolated float values
func _ready() -> void:
    var tween := create_tween()
    tween.tween_method(_set_health_bar, 100.0, 0.0, 2.0)

func _set_health_bar(value: float) -> void:
    $HealthBar.value = value
    $HealthLabel.text = "%d%%" % int(value)

public override void _Ready()
{
    var tween = CreateTween();
    tween.TweenMethod(Callable.From<float>(SetHealthBar), 100.0f, 0.0f, 2.0f);
}

private void SetHealthBar(float value)
{
    GetNode<ProgressBar>("HealthBar").Value = value;
    GetNode<Label>("HealthLabel").Text = $"{(int)value}%";
}

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3. Sequencing — Chain vs Parallel

Sequential (Default)

By default, tweeners run sequentially — each waits for the previous to finish.

var tween := create_tween()
tween.tween_property(self, "position:x", 300.0, 0.5)   # Step 1
tween.tween_property(self, "position:y", 200.0, 0.5)   # Step 2 (after Step 1)
tween.tween_property(self, "rotation", PI, 0.3)         # Step 3 (after Step 2)

Parallel — Run tweeners simultaneously

Option 1: set_parallel(true) — All tweeners run at once

var tween := create_tween().set_parallel(true)
tween.tween_property(self, "position", Vector2(300, 200), 0.5)
tween.tween_property(self, "rotation", PI, 0.5)
tween.tween_property(self, "modulate:a", 0.5, 0.5)

var tween = CreateTween().SetParallel(true);
tween.TweenProperty(this, "position", new Vector2(300, 200), 0.5f);
tween.TweenProperty(this, "rotation", Mathf.Pi, 0.5f);
tween.TweenProperty(this, "modulate:a", 0.5f, 0.5f);

Option 2: chain() — Switch back to sequential mid-tween

var tween := create_tween().set_parallel(true)
# These two run at the same time
tween.tween_property(self, "position", Vector2(300, 200), 0.5)
tween.tween_property(self, "scale", Vector2(2, 2), 0.5)
# Switch back to sequential for the next step
tween.chain().tween_property(self, "modulate:a", 0.0, 0.3)
tween.tween_callback(queue_free)

var tween = CreateTween().SetParallel(true);
tween.TweenProperty(this, "position", new Vector2(300, 200), 0.5f);
tween.TweenProperty(this, "scale", new Vector2(2, 2), 0.5f);
tween.Chain().TweenProperty(this, "modulate:a", 0.0f, 0.3f);
tween.TweenCallback(Callable.From(QueueFree));

Option 3: parallel() — Make the next tweener parallel with the previous

var tween := create_tween()
tween.tween_property(self, "position", Vector2(300, 200), 0.5)
# This runs at the same time as position, not after
tween.parallel().tween_property(self, "rotation", PI, 0.5)
# This runs after both finish (back to sequential)
tween.tween_callback(func(): print("done"))

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4. Easing & Transitions

Setting Easing

var tween := create_tween()
# Set defaults for the entire tween
tween.set_trans(Tween.TRANS_CUBIC).set_ease(Tween.EASE_OUT)
tween.tween_property(self, "position", Vector2(400, 300), 0.6)

var tween = CreateTween();
tween.SetTrans(Tween.TransitionType.Cubic).SetEase(Tween.EaseType.Out);
tween.TweenProperty(this, "position", new Vector2(400, 300), 0.6f);

Per-Tweener Override

var tween := create_tween()
# This tweener uses bounce, overriding the tween default
tween.tween_property(self, "position:y", 0.0, 0.5) \
    .set_trans(Tween.TRANS_BOUNCE).set_ease(Tween.EASE_OUT)

var tween = CreateTween();
tween.TweenProperty(this, "position:y", 0.0f, 0.5f)
    .SetTrans(Tween.TransitionType.Bounce)
    .SetEase(Tween.EaseType.Out);

Transition Types

Transition	Character	Common Use
TRANS_LINEAR	Constant speed	Progress bars, timers
TRANS_SINE	Gentle acceleration	Subtle UI animations
TRANS_QUAD	Moderate curve	General movement
TRANS_CUBIC	Smooth curve	Most UI transitions
TRANS_QUART	Strong curve	Dramatic entrances
TRANS_QUINT	Very strong curve	Emphasis effects
TRANS_EXPO	Exponential — sharp start/stop	Snap-to-position
TRANS_CIRC	Circular — smooth deceleration	Natural motion
TRANS_BACK	Overshoots target slightly	Bouncy UI buttons
TRANS_ELASTIC	Spring oscillation	Playful/cartoon effects
TRANS_BOUNCE	Bounces at the end	Dropping objects, landing

Ease Types

Ease	Behavior
EASE_IN	Slow start, fast end
EASE_OUT	Fast start, slow end (most natural)
EASE_IN_OUT	Slow at both ends
EASE_OUT_IN	Fast at both ends (rarely used)

Most common combo: TRANS_CUBIC + EASE_OUT for natural-feeling UI transitions. TRANS_BACK + EASE_OUT for playful bounce-in effects.

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5. PropertyTweener Modifiers

Each tween_property() call returns a PropertyTweener you can chain modifiers on: .from(value) for a custom start, .from_current() to capture current value, .as_relative() to add (not replace), .set_delay(seconds) to delay this tweener's start.

See references/property-tweener-modifiers.md for full code examples of each modifier.

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6. Looping and Signals

tween.set_loops(N) repeats N times (0 = infinite). Signals: finished (whole tween done), step_finished(idx) (one step done), loop_finished(loop_count) (one full cycle done).

See references/looping-and-signals.md for loop-count semantics and signal wiring.

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7. Tween Lifecycle

Tweens are owned by their host SceneTree. Kill running tweens with tween.kill() before starting a new one to avoid stacking. Use set_pause_mode, set_speed_scale, set_ignore_time_scale for runtime control.

See references/lifecycle.md for kill/replace patterns, pause modes, speed scale, ignore-time-scale.

has_tweeners() (Godot 4.7+)

Tween.has_tweeners() (const) returns true if any Tweener has been added to the tween and the tween is valid — useful when tweeners are appended dynamically and the tween can end up empty. Killing an empty tween before it starts prevents errors.

var tween := create_tween()
_add_intro_steps(tween)  # may append zero tweeners
if not tween.has_tweeners():
    tween.kill()

var tween = CreateTween();
AddIntroSteps(tween); // may append zero tweeners
if (!tween.HasTweeners())
    tween.Kill();

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8. Common Recipes

The patterns most projects need: fade in/out, UI panel slide in/out, button press bounce, damage number popup, pulsing/breathing effect, screen shake, shader parameter animation.

See references/common-recipes.md for ready-to-use code for each recipe.

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9. Common Pitfalls

Symptom	Cause	Fix
Tween jumps or jitters	Multiple tweens competing on the same property	Kill the old tween before creating a new one
Tween does nothing	Node was freed before tween finished	Check is_valid() or use tween_callback instead of await
Tween runs during pause	Default pause mode doesn't match expectation	Set set_pause_mode(TWEEN_PAUSE_PROCESS) for pause-immune tweens
from() value ignored	Called after set_parallel() changed ordering	Call from() directly on the PropertyTweener, not on the Tween
Tween doesn't loop smoothly	End value doesn't match start for seamless loop	Use as_relative() for rotation, or match start/end values
Relative tween drifts over loops	as_relative() accumulates each loop	Use absolute values for looping; relative for one-shot moves
Callback fires at wrong time	Callback added to parallel section	Use chain() to switch back to sequential before the callback
Tween property path not found	Typo or wrong path format	Use "property:component" — e.g., "position:x", "modulate:a"
Tween faster/slower than expected	Engine.time_scale affects tween	Use set_ignore_time_scale() for UI tweens during slow-mo

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10. Implementation Checklist

• Old tweens are killed before creating new ones on the same property
• Tween references are stored in variables when they need to be killed later
• Easing is set (TRANS_CUBIC + EASE_OUT for natural motion, not default TRANS_LINEAR)
• set_parallel(true) is used when multiple properties should animate simultaneously
• chain() is used to switch back to sequential after parallel sections
• from() or from_current() is used when the start value matters (not just the end value)
• as_relative() is used for incremental movement instead of computing absolute targets
• Looping tweens use set_loops() — not manual recreation
• Tweens that must run during pause use set_pause_mode(TWEEN_PAUSE_PROCESS)
• tween_callback(queue_free) is used at the end of fire-and-forget sequences (damage numbers, particles)