Q. How can I give different transmissivity with more than 3 wavelength region? I used Discrete Ordinates (DO) Model since it is the only model with 'semi-transparent' and 'non-gray' mode. I want to give material A (semi-transparent) transmissivity or emissivity like this: ex) t=0.75 in 0 to 4 µm, or e = 0.25 t= 0.75 in 4 ~8 µm, or e = 0.25 t=0.75 in 8~14 µm, or e = 0.25

t = 0.0001 in 14 – 1000 µm, or e = 0.9999 (t is transmissivity), e = emissivity.

But when I change BC type of a material A from opaque to semi-transparent in boundary condition - radiation tab, I made four bands, 0 – 4, 4 – 8, 8-14, 14-1000 µm in Model - Radiation - Number of Bands, but I could only change Direct / Diffuse Irradiation and Diffuse Fraction of each band, not transmissivity or emissivity of each band. Please, someone can guide me, it would be a great help,

Is it possible to give each band different emissivity?