Complex IOR - Arnold for Houdini

This shader can be used to render materials with complex index of refractions. The standard shader can compute the Fresnel effect for dielectric materials like plastic and glass based on the refractive index of the material; however, metals have a more complicated Fresnel reflective curve that also depends on another parameter called extinction coefficient.

_{Complex_IOR -> standard.specular_color of (specular_fresnel disabled)}