---
title: shaderModifiers
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnshadable/shadermodifiers
---

# shaderModifiers

A dictionary of GLSL source code snippets for customizing the shader programs provided by SceneKit.

## Declaration

```swift
optional var shaderModifiers: [SCNShaderModifierEntryPoint : String]? { get set }
```

## Discussion

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 NSString 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 in the protocol overview for a complete discussion of shader modifiers.