# Passthrough

> Causes the Playable to act as a passthrough for PrepareFrame and ProcessFrame. If the PlayableOutput being processed is connected to the n-th input port of the Playable, the Playable only propagates the n-th output port. Use this enum value in conjunction with PlayableOutput SetSourceOutputPort.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.Playables](/engine/6000.6/script-reference/unityengine/playables.md)
* **Assembly:** UnityEngine.CoreModule

```csharp
Passthrough = 1
```