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