# Effects Fade, flash, shake and pulse entity properties with shared easing. [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 - [Effects.fade()](https://rustic-game-engine.pages.dev/markdown/api/effects/fade.md) - [Effects.flash()](https://rustic-game-engine.pages.dev/markdown/api/effects/flash.md) - [Effects.shake()](https://rustic-game-engine.pages.dev/markdown/api/effects/shake.md) - [Effects.pulse()](https://rustic-game-engine.pages.dev/markdown/api/effects/pulse.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 Entity is a stable ID or scene path. Opacity is scalar, Color is RGB, Scale is a three-component vector, and shake strength controls the position offset. Duration is finite non-negative seconds; easing defaults to Linear. ## Return and timing Each returns an operation handle. Flash and pulse ping-pong through the outgoing and return legs; their duration applies to each leg. Fade changes Opacity once; shake restores its initial position. ## Behavior and limitations - A Part flashes red and returns to its original color after two quarter-second legs. - Opacity and Color obey bounded property contracts. These actions operate on existing properties rather than creating particles or arbitrary UI components. - Shake uses deterministic decaying offsets. Avoid overlapping actions or physics that write the same property. Camera.shake uses the same implementation. - 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.