# Tween Animate an entity property or script value without writing an Update loop. [Feature status and language/platform compatibility](https://rustic-game-engine.pages.dev/markdown/reference/compatibility.md) Choose an API to see its signature, parameters, examples and behavior. ## APIs - [Tween.to()](https://rustic-game-engine.pages.dev/markdown/api/tween/to.md) - [Tween.move()](https://rustic-game-engine.pages.dev/markdown/api/tween/move.md) - [Tween.rotate()](https://rustic-game-engine.pages.dev/markdown/api/tween/rotate.md) - [Tween.scale()](https://rustic-game-engine.pages.dev/markdown/api/tween/scale.md) - [Tween.value()](https://rustic-game-engine.pages.dev/markdown/api/tween/value.md) ## Module guide ## Setup and language support These engine-owned services work in Lua 5.4, Luau, JavaScript, Python, C, C++, C#, Java, PHP, and HTML inline JavaScript. Follow [Use gameplay actions](https://rustic-game-engine.pages.dev/markdown/guides/gameplay-actions.md) to create and attach a script, install external toolchains, and choose the correct language binding. PHP and HTML scripts belong under `ui/`; CSS alone runs no gameplay code. The Calls section uses JavaScript signatures. The function examples below include native syntax for all ten script types, including SDK-specific alternatives and limitations. Attach a JavaScript Object Component script to the specified target and press **Play**. Globals are supplied by the engine. Schedule actions from `Start` or a callback, rather than at script top level. Native languages use typed options and their own builder conventions; see the guide's language bindings. ## Parameters | Parameter | Meaning | | --- | --- | | entity | Stable entity ID, resolvable scene path or object proxy; null means the script owner in JavaScript. | | property | Position, Scale/Size, Rotation, Color, Opacity, perspective Fov, or audio voice Volume/Pitch. | | to / from | Finite scalar, three-component vector or nonzero four-component quaternion matching the property. | | timing | Finite non-negative seconds, or an object with exactly one of duration or positive speed. | | easing | An Ease constant; Linear by default. Options can supply easing. | | onUpdate | Receives each interpolated value for script/UI state. | ## Return and timing Entity and value tweens return an [operation handle](https://rustic-game-engine.pages.dev/markdown/api/operation-handles.md). The engine advances it each scene frame and queues completion during Update. No user Update callback is required. ## Behavior and limitations - Attach this example to an anchored Part: it reaches local position (10, 0, 0) in two seconds and prints arrived. - The start value is captured on first advancement. Zero duration applies the final value on the next advancing frame. - Speed is units/second, or radians/second for rotation. Easing changes instantaneous velocity; speed-based duration uses the total distance. - Transforms are local to the parent. Opacity and Color are bounded; Fov is in radians between zero and pi on perspective cameras. Arbitrary component reflection is not supported; use value callbacks for your state. - Avoid physics or Update writes to the same property. If multiple actions write it, the last-created action writes last. - Check script attachment, enabled state and the Console when an operation fails. Asynchronous errors also appear in operation state. Callback exceptions disable the owner and clean up its actions. - Owner destruction, disable, successful reload or Stop cleans up owned actions and subscriptions. Failed reload retains the previous behavior's operations. See [Operation handles](https://rustic-game-engine.pages.dev/markdown/api/operation-handles.md) for controls and lifetime details.