Closure Example

closureExample.c

shader closureExample(
    normal Normal = N,

    float DiffuseRoughness = 0.01,
    color DiffuseColor = 0.0,
    
    float GlassRoughness = 0.125,
    float GlassIor = 1.45,
    float GlassReflectivity = 0.125,
    color GlassColor = 1.0,

    float Pattern = 0.5,

    output closure color Surface = diffuse(N)) {

    closure color diff = DiffuseColor * oren_nayar(Normal, DiffuseRoughness);

    closure color refl = reflection(Normal);
    closure color beck = GlassColor * microfacet_beckmann_refraction(
        Normal, GlassRoughness, GlassIor);
    closure color glass = (1.0 - GlassReflectivity) * beck
        + GlassReflectivity * refl;

    Surface = (1.0 - Pattern) * diff + Pattern * glass;
}