# shaderModifiers A dictionary of GLSL source code snippets for customizing the shader programs provided by SceneKit. ``` optional var shaderModifiers: [SCNShaderModifierEntryPoint : String]? { get set } ``` ## Discussion The dictionary’s keys must be from the set of constants described in `Shader Modifier Entry Point Keys`. Each key represents a possible entry point in SceneKit’s shader programs, whose corresponding value is an object containing a shader source code snippet to be included in the shader program at that entry point. See [`Use Shader Modifiers to Extend SceneKit Shading`](/documentation/SceneKit/SCNShadable#Use-Shader-Modifiers-to-Extend-SceneKit-Shading) in the protocol overview for a complete discussion of shader modifiers. --- 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)