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# FadeAlpha(CanvasGroup,float,float,float,CoroutineInterruptToken)

Method in [Effects](/2.5/api/csharp/yarn.unity/yarn.unity.effects.md)

## Summary

A coroutine that fades a `UnityEngine.CanvasGroup` object's opacity from `from` to `to` over the course of `fadeTime` seconds, and then invokes `onComplete` .

```csharp
public static IEnumerator FadeAlpha(CanvasGroup canvasGroup, float from, float to, float fadeTime, CoroutineInterruptToken stopToken = null)
```

## Parameters

| Name                                                                                                                                                | Description                                                                                                                                                           |
| --------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `float` from                                                                                                                                        | The opacity value to start fading from, ranging from 0 to 1.                                                                                                          |
| `float` to                                                                                                                                          | The opacity value to end fading at, ranging from 0 to 1.                                                                                                              |
| [Yarn.Unity.Effects.CoroutineInterruptToken](/2.5/api/csharp/yarn.unity/yarn.unity.effects/yarn.unity.effects.coroutineinterrupttoken.md) stopToken | A [CoroutineInterruptToken](/2.5/api/csharp/yarn.unity/yarn.unity.effects/yarn.unity.effects.coroutineinterrupttoken.md) that can be used to interrupt the coroutine. |
| `CanvasGroup` canvasGroup                                                                                                                           |                                                                                                                                                                       |
| `float` fadeTime                                                                                                                                    |                                                                                                                                                                       |