## On the Form Factor between Two Polygons

Peter Schröder and
Pat Hanrahan.
Proceedings of SIGGRAPH 1993

### Abstract

Form factors are used in radiosity to describe the fraction of diffusely
reflected light leaving one surface and arriving at another. They are a
fundamental geometric property used for computation. Many special
configurations admit closed form solutions. However, the important case of
the form factor between two polygons in three space has had no known closed
form solution. We give such a solution for the case of general (planar,
convex or concave, possibly containing holes) polygons.
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