# Sandbox.Animation.GraphBuilder.BlendSpaceBuilder.Add

```csharp
BlendSpaceBuilder Add(float position, Node source)
```

Play `source` when the parameter is at `position`.

### Parameters

- `position` (`float`)
- `source` (`Node`)

### Returns

`BlendSpaceBuilder`

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