# Sandbox.Painter.FilterBackdrop

```csharp
void FilterBackdrop(Rect rect, Filter filter, CornerRadii corners = null)
```

Filter pixels already drawn behind a rectangle. Captures the current transform, clip, opacity and blend mode.

### Parameters

- `rect` (`Rect`)
- `filter` (`Filter`)
- `corners` (`CornerRadii`), default `null`

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