Type Alias

SCNShaderModifierEntryPoint

Keys for the shaderModifiers dictionary, each corresponding to an entry point in SceneKit’s shader programs where you can attach a custom GPU shader code snippet.

Declaration

typedef NSString *SCNShaderModifierEntryPoint;

Discussion

For details on shader modifiers, see Use Shader Modifiers to Extend SceneKit Shading in the protocol overview.

SceneKit inserts your shader modifiers into its shader program in the order shown here, so you can use the structures defined by earlier entry points in later entry points. For example, a snippet associated with the SCNShaderModifierEntryPointFragment entry point can read from the _surface structure defined by the SCNShaderModifierEntryPointSurface entry point.

Topics

Type Properties

SCNShaderModifierEntryPointFragment

Use this entry point to change the color of a fragment after all other shading has been performed.

SCNShaderModifierEntryPointGeometry

Use this entry point to deform a geometry’s surface or alter its vertex attributes.

SCNShaderModifierEntryPointLightingModel

Use this entry point to provide a custom lighting equation.

SCNShaderModifierEntryPointSurface

Use this entry point to modify the surface properties of a material before lighting is computed.