Modified model of polarized bidirectional reflectance distribution function for metallic surfaces

The previous two-component polarized bidirectional reflectance distribution function (pBRDF) model with specular reflection and diffuse reflection is modified. A pBRDF model for metallic materials based on a three-component assumption in which the reflection is divided into specular reflection, directional diffuse reflection and ideal diffuse reflection is presented. The specular component is given based on microfacet theory and Fresnel's law. This part contains all the polarization information. The directional diffuse reflection and the ideal diffuse reflection are depolarized but are treated separately according to the experimental results. Simulation and measurement results of Al and Cu samples suggest that this three-component model can reduce the error due to the constant diffuse reflection, and better describe the polarized reflection characteristics for metallic surfaces in the hemisphere space accurately.