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Simplification 1: Assume only diffuse surfaces.
Instead of BRDF , use reflectance .
Instead of radiances , use radiosity .

Resulting Radiosity Equation:



Simplification 2: Spatial Discretization
Assume scene consisting of patches with constant radiosity


Plug the Radiosity Equation into this:


We know that is constant over (with value ), thus we can pull it out of the integral:




with the Form Factors