# SCNNodeRendererDelegate Methods you can implement to use your own custom Metal or OpenGL drawing code to render content for a node. ``` protocol SCNNodeRendererDelegate : NSObjectProtocol ``` ## Overview Typically, you use a node renderer delegate to perform custom rendering that is anchored at a location in the scene. For example, you can attach a node with a renderer delegate to part of a scene in order to add a special effect rendered using your own Metal or OpenGL drawing code, such as a fluid simulation. To provide a renderer delegate for an [`SCNNode`](/documentation/SceneKit/SCNNode) object, use its [`rendererDelegate`](/documentation/SceneKit/SCNNode/rendererDelegate) property. SceneKit performs no rendering of its own for a node with a render delegate, so this protocol is not appropriate for customizing SceneKit’s rendering of geometry and materials. Instead, use methods in the [`SCNShadable`](/documentation/SceneKit/SCNShadable) protocol to extend SceneKit’s rendering using shader programs written in the Metal shading language or the OpenGL Shading Language (GLSL). ## Topics ### Customizing the Rendering of a Node [`- renderNode:renderer:arguments:`](/documentation/SceneKit/SCNNodeRendererDelegate/renderNode(_:renderer:arguments:)) Tells the delegate to perform rendering for a node. ## Relationships ### Inherits From [`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol) --- 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)