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The Radiosity Equation.

The 'radiosity equation' describes the amount of energy which can be
emitted from a surface, as the sum of the energy inherent in the
surface (a light source, for example) and the energy which strikes the
surface, being emitted from some other surface.  The energy which
leaves a surface (surface j) and strikes another surface (surface i) is
attenuated by two factors:

1. the 'form factor' between surfaces i and j, which
accounts for the physical relationship between the two
surfaces,

2. the reflectivity of surface i, which will absorb a certain
percentage of light energy which strikes the surface.