# Opacity

> The opacity multiplier applied to the referenced transition.

## Definition

* **Type:** Property
* **Namespace:** [Unity.GraphToolkit.Editor.GraphVisualization](/engine/6000.7/script-reference/unity/graphtoolkit/editor/graphvisualization.md)
* **Assembly:** UnityEditor

```csharp
public float Opacity { get; set; }
```

### Remarks

The opacity multiplier is clamped to the \[0, 1] range when set. Setting a new value overwrites any existing opacity override for that transition. On a transition between two states, this property fades the transition wire and leaves the arrow solid. On a self transition, this property fades the transition arrow's border, leaving the arrow head solid. Getting or setting this property has no effect, and getting it returns `1f`, when the [TransitionReference](/engine/6000.7/script-reference/unity/graphtoolkit/editor/graphvisualization/transitionreference.md) has no associated [TransitionReference.Context](/engine/6000.7/script-reference/unity/graphtoolkit/editor/graphvisualization/transitionreference/context.md), such as when it is `default`. Throws ObjectDisposedException when you access this property after you call [Context.Dispose](/engine/6000.7/script-reference/unity/graphtoolkit/editor/graphvisualization/context/dispose.md) on the context.

Reduce the opacity of a transition to draw it semi-transparently in the state machine canvas, for example to de-emphasize a transition that was not taken.

### Examples

```csharp
TransitionReference transitionRef = context.GetTransitionReference(transitionID);
transitionRef.Opacity = 0.5f;
```