IGI: Inverse Radiosity
§The
surfaces of the environment are broken into a finite number of patches
§Patches
assumed to have constant radiosity and diffuse albedo
§For
each patch:
Bi = Ei + ρiΣjBjFij
Bi is the
radiosity
Ei is the emission
ρi is the diffuse
albedo
Fij is the form
factor between the patches
The form factor is the total power leaving patch i that
is received by patch j
§Bi and Ei are measured from a photo with known
geometry. Fij is derived from
the geometry. So we can find the
diffuse portion of the reflection:
§ρi = (Bi - Ei)/(ΣjBjFij)