“Radiosity algorithms using higher order finite element methods” by Troutman and Max

Many of the current radiosity algorithms create a piecewise constant approximation to the actual radiosity. Through interpolation
and extrapolation, a continuous solution is obtained. An accurate
solution is found by increasing the number of patches which describe
the scene. This has the effect of increasing the computation time as
well as the memory requirements. By using techniques found in the
finite element method, we can incorporate an interpolation function
directly into our form factor computation. We can then use less elements to achieve a more accurate solution. Two algorithms, derived
from the finite element method, are described and analyzed

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