Solar Radiation Model
This option is used to specify the solar radiation model for the solar radiation surface.
The parameters that specify the Solar Model are:
- Specular transmissivity (τs): Occurs when a photon passes straight through a surface with no change of direction.
- Diffuse transmissivity (τd): The photon penetrates the surface, but its outgoing energy is uniformly distributed in solid angle over the hemisphere, weighted by projected surface area.
- Specular reflectivity (ρs): The angle of reflection is equal to the angle of incidence.
- Diffuse reflectivity (ρd): These are similar to diffuse transmissions, except the hemisphere over which the outgoing energy is distributed is on the same side of the surface as the incident photon.
- Finally, the photon may be absorbed (α) by the surface. These five interactions are
associated with five surface properties that together must obey the following
constraint:
τs(θ) + τd(θ) + ρs(θ) + ρd(θ) + α(θ) = 1.0 (θ is angle of incidence)
