# On Opacity Change

## Overview

![The On Opacity Change Node.](https://926825830-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FKQhJdUBr7YQzfIwmpAZ9%2Fuploads%2Fgit-blob-075aa15fada4be7d5639b1c75a8a003c59f71d00%2Fonopacitychangeupdatedimage.png?alt=media)

**On Opacity Change** is an **Event Listener** **Node** used for executing a **Logic Branch** when the **Opacity** value of an **Object** changes.

[**Scope**](https://docs.incari.com/incari-studio/2022.1/overview#scopes): **Scene**, **Prefab**.

## Attributes

![The On Opacity Change Node Attributes.](https://926825830-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FKQhJdUBr7YQzfIwmpAZ9%2Fuploads%2Fgit-blob-42795afd0ae868061ca84612e75e94802767da37%2Fonopacitychangeattributes.png?alt=media)

| Attribute | Type         | Description                                                                                                                                    |
| --------- | ------------ | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| `Object`  | **ObjectID** | The **Object** in which a change of the **Opacity** value triggers the **Logic Branch**, if none is given in the `Object ID` **Input Socket**. |

## Inputs

| Input           | Type         | Description                                                                              |
| --------------- | ------------ | ---------------------------------------------------------------------------------------- |
| `Object ID`     | **ObjectID** | The **Object** in which a change of the **Opacity** value triggers the **Logic Branch**. |
| `Subscribe` (►) | **Pulse**    | An **Input Pulse** that needs to be triggered to start listening to the **Event**.       |

## Outputs

| Output             | Type         | Description                                                                                                                            |
| ------------------ | ------------ | -------------------------------------------------------------------------------------------------------------------------------------- |
| *Pulse Output* (►) | **Pulse**    | A standard **Output Pulse**, to move onto the next **Node** along the **Logic Branch**, once this **Node** has finished its execution. |
| `Opacity`          | **Float**    | The modified **Opacity** value.                                                                                                        |
| `Object ID`        | **ObjectID** | The **Object** received as **Input**.                                                                                                  |

## See Also

* [**Events**](https://docs.incari.com/incari-studio/2022.1/toolbox/events)
* [**Object**](https://docs.incari.com/incari-studio/2022.1/toolbox/events/object)