# Sandbox.Animation.GraphBuilder.VirtualBoolParameter

```csharp
Node VirtualBoolParameter(string name, Node value)
```

Name a computed bool value as a virtual parameter. Unlike a control parameter it
is not set externally - it evaluates `value` each frame - but it
can be reflected into referenced child graphs by name.

### Parameters

- `name` (`string`)
- `value` (`Node`)

### Returns

`Node`

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