godot-tweening

Decision Tree — Tween vs AnimationPlayer

Situation	Choose
One-off UI juice, hover, popup, score count, recoil	Tween (create_tween)
Authored multi-track clips, scrubbable timelines, blend trees	AnimationPlayer / AnimationTree
Camera continuous follow behind a moving target	Camera2D.position_smoothing / spring follow — not a new Tween every _process
Menu motion while Engine.time_scale == 0	Tween with set_ignore_time_scale(true) — MANDATORY time_scale_ignored_ui.gd
Retriggerable property (button spam, dodge cancel)	Kill-before-recreate — MANDATORY safe_tween_interruption.gd
Physics body / net correction motion	TWEEN_PROCESS_PHYSICS + reset_physics_interpolation

Available Scripts

MANDATORY: Read the script for the case above before writing tween glue.

safe_tween_interruption.gd

MANDATORY for any retriggerable tween — kill active tweens before starting new ones.

time_scale_ignored_ui.gd

MANDATORY for pause-menu / time_scale == 0 UI motion.

nested_subtween_cutscene.gd

MANDATORY for composable cutscene timelines via tween_subtween.

parallel_popup_animation.gd

set_parallel(true) + chain() for multi-property UI transitions.

text_counter_method_tween.gd

tween_method for non-property values (score strings).

custom_curve_tween.gd

Curve resources for bespoke easing.

camera_shake_tween_logic.gd

Procedural screen shake with looping tweens (offset, not follow).

relative_recoil_tween.gd

as_relative() / from_current() for recoil nudges.

staggered_inventory_entry.gd

Sequential collection entry on one Tween.

looped_hover_vfx.gd

Infinite ping-pong ambient juice.

juice_manager.gd / tween_builder.gd

Central juice dispatch / builder helpers when many systems share feel presets.

NEVER Do in Tweening

• NEVER instantiate a Tween using Tween.new() — Always use create_tween() or get_tree().create_tween() [3, 4].
• NEVER attempt to reuse a finished Tween — Single-use; recreate to replay [4].
• NEVER manually instantiate PropertyTweener or CallbackTweener — Only via parent Tween methods [5].
• NEVER create an infinite loop containing only 0-duration animations — Freezes the engine [10].
• NEVER use multiple Tweens to animate the same property simultaneously — kill() the old reference first [11, 12].
• NEVER use linear interpolation for UI/Juice — Prefer EASE_OUT + TRANS_QUAD or EASE_IN_OUT + TRANS_CUBIC [22].
• NEVER create tweens in _process without guards — Creating 60 tweens per second will crash the app.
• NEVER skip bind_node(self) for non-global tweens — Binding ensures death with the node [13].
• NEVER use 0-duration tweens for state changes — Set the property directly [20].
• NEVER forget to call chain() when returning from set_parallel(true) [15].

---

Lifecycle Golden Path

var _tween: Tween

func animate_to(pos: Vector2) -> void:
    if _tween and _tween.is_valid():
        _tween.kill()
    _tween = create_tween().bind_node(self)
    _tween.set_ease(Tween.EASE_OUT).set_trans(Tween.TRANS_QUAD)
    _tween.tween_property(self, "position", pos, 0.35)

MANDATORY pattern source: safe_tween_interruption.gd.

Camera Follow (Correct)

Continuous follow is not a Tween job:

extends Camera2D
@export var target: Node2D

func _ready() -> void:
    position_smoothing_enabled = true
    position_smoothing_speed = 5.0

func _physics_process(_delta: float) -> void:
    if target:
        global_position = target.global_position

If you must tween a one-shot camera punch/return, keep one Tween reference and kill before recreate — never create_tween() inside unguarded _process.

Expert Patterns (keep)

Physics-Sync-Tweening

func apply_physics_tween(target: Node3D, start_pos: Vector3, goal: Vector3) -> void:
    target.global_position = start_pos
    target.reset_physics_interpolation()
    var tween := create_tween().bind_node(target)
    tween.set_process_mode(Tween.TWEEN_PROCESS_PHYSICS)
    tween.tween_property(target, "global_position", goal, 0.5)

Juice-Config-Resource

Store duration/trans/ease in a Resource (see juice scripts) so feel is data-driven.

Tween-Event-Sequencing

Parallel block → chain() → interval/callback → exit. Prefer nested_subtween_cutscene.gd for nested modules.

Bezier-Path-Tween

Tween PathFollow2D.progress_ratio instead of hand-rolled Bezier math.

Deep recipes (on demand)

LLM-ignorance rule: if a general agent would not know it before reading, it lives here or in scripts/ — never delete, only move.

Topic	Reference
Chains, kill, gotchas	tween-recipes-and-gotchas.md

Reference

Progressive disclosure: open Official Documentation links only when researching a specific API; load Related Skills when routing to a peer domain — do not preload the whole lattice.

Official Documentation

• Tween — create_tween, parallel/chain, loops, process mode, ignore_time_scale, and kill/lifecycle rules.
• PropertyTweener — tween_property details: as_relative, from_current, custom interpolators, and per-step ease/trans.
• MethodTweener — tween_method for non-property values (score counters, shader params, Curve-sampled motion).
• CallbackTweener — tween_callback for sequenced side effects without inventing fake 0-duration property steps.
• IntervalTweener — tween_interval delays inside a single Tween timeline.
• SubtweenTweener — tween_subtween for nested cutscene modules under one parent timeline.
• Interpolation — lerp/smoothstep foundations behind easing choices and custom interpolators.
• Beziers, curves and paths — Curve/PathFollow patterns used when property tweens alone cannot describe the path.
• Introduction to the animation features — when Tween juice is enough versus AnimationPlayer/AnimationTree authored tracks.
• Using SceneTree — SceneTree.create_tween and node lifetime when bind_node is not enough.
• Idle and Physics Processing — idle vs physics process modes for TWEEN_PROCESS_PHYSICS sync.
• Physics interpolation quick start guide — reset_physics_interpolation when tweening transforms on interpolated bodies.

Related Skills

Prerequisites

• godot-project-foundations — scene tree, Node ownership, and resource basics before create_tween/bind_node lifecycle patterns.
• godot-gdscript-mastery — typed callables, lambdas, and await/signal idioms used in tween_method and finished handlers.

Complements

• godot-2d-animation — sprite/skeleton motion that often coexists with Tween juice and needs shared kill/lifecycle discipline.
• godot-animation-player — authored clips for complex timelines; Tweens stay for runtime/procedural UI and one-off juice.
• godot-ui-containers — Control size/pivot/layout context for popup scale-fade and staggered inventory entry tweens.
• godot-signal-architecture — finished/callback wiring without dangling connections when Tweens are killed and recreated.
• godot-camera-systems — camera follow, shake offsets, and look targets driven by procedural Tweens.
• godot-resource-data-patterns — JuiceConfig-style Resources that store duration/trans/ease outside gameplay scripts.
• godot-particles — burst timing and one-shot VFX that should start from tween_callback steps, not parallel ad-hoc timers.
• godot-shaders-basics — shader params animated via tween_method / set when property paths are not enough.

Downstream / consumers

• godot-inventory-system — slot/item entry, drag feedback, and equip juice built on staggered and interruptible Tweens.
• godot-genre-card-game — hand arcs, draw/discard flights, and resolve polish that depend on Tween chaining.
• godot-ui-theming — theme-driven hover/focus motion that still needs safe Tween interruption under the same Control.

Master

• godot-master — library router and mirrored module entry for cross-skill discovery.