This is a specialized material that adds a diffuse component to the geometry. It duplicates the features of Dali Physical.
F (Front)
Specifies the reflectivity of the front surface. Important: in this material, the frontal side is defined as the side from which the beam came. It may not coincide with the direction of the normals.
T (Translucency)
Determines the proportion of energy that will pass through the material.
B (Back)
Sets the emissivity of the side opposite the front. In order for the beam energy to escape from this side, the Translucency parameter must not be zero.
Roughness
Specifies the roughness of the geometry: model and value. Diffuse models of Lambert, Oren-Nayar, Disney, Hammon are supported. The roughness value can be changed depending on the wavelength. Value 0 - smooth Lambert model, 1 - completely rough.
Spectral range
Specifies the interval of the spectrum on which the spectral splines are defined.
