Abstract
Rendering scattering materials is an important issue in realistic rendering. This paper describes calculation and interpolation methods of BRDFs/BTDFs (Bi-directional Reflectance/Transmittance Distribution Functions) of scattering materials. We introduced the plane-parallel scattering theory, which enables us analytic calculation of BRDFs/BTDFs of uniform scattering materials. We analysed calculated BRDFs/BTDFs and proposed their interpolation methods against scattering parameters and width of scattering materials.
