Karthik R
Hi,nYou can set up the absorptivity and scattering coefficient under the material properties. Internal emissivity can be set under the Boundary Conditions settings. You can set up the reflectivity also from the boundary conditions panel. You might want to look at the 'Diffuse Fraction' for setting transmittivity and reflectivity on semi transparent wall.nPlease check this link.nThanks.nKarthikn