# Sandbox.Animation.GraphBuilder.ExternalGraphSlot

```csharp
Node ExternalGraphSlot(string slotName, Node fallback = null)
```

An empty child-graph slot filled at runtime by native integration using
`slotName`. Plays `fallback` (or nothing) while empty.

### Parameters

- `slotName` (`string`)
- `fallback` (`Node`), default `null`

### Returns

`Node`

Declared in [Sandbox.Animation.GraphBuilder](/api/Sandbox.Animation.GraphBuilder).
Assembly: `Sandbox.Engine`.