Energy Conservation with Scatter and Coatings
During a raytracing process, rays encounter surfaces that might have a combination of reflection, transmission, absorption and scatter properties that split the rays into various components. FRED allocates flux values to each ray by looking at these surface properties in a specific order. The user needs to understand this order to be certain that the actual flux values created during the raytrace are as expected. This is demonstrated by considering a surface that has Lambertian scatter properties along with a user defined specular reflection coefficient.
Download the PDF: Energy Conservation with Scatter and Coating
Download the FRED File: LambertianBackScatterAndReflectingCoating.frd