# PostProcessingPass.ApplyFilterPassSettingsDelegate

> The optional callback to prepare the material property block for the effect.

## Definition

* **Type:** Delegate
* **Namespace:** [UnityEngine.UIElements](/engine/6000.6/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
public delegate void PostProcessingPass.ApplyFilterPassSettingsDelegate(MaterialPropertyBlock mpb, FilterPassContext context)
```