# PostProcessEffect A protocol that defines hooks for custom post processing effects. ``` protocol PostProcessEffect : Sendable ``` ## Overview RealityKit calls each method in this protocol at a predefined time. For example, RealityKit calls the [`postProcess(context:)`](/documentation/RealityKit/PostProcessEffect/postProcess(context:)) method every frame, after RealityKit renders the scene, but before displaying it in your app. Adopt this protocol in a custom object and apply it to your [`RealityViewCameraContent`](/documentation/RealityKit/RealityViewCameraContent) to apply fine-grained control over the render loop. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)