@inproceedings{Hanrahan1991ARH,
title={A rapid hierarchical radiosity algorithm},
author={Pat Hanrahan and David Salzman and Larry Aupperle},
booktitle={SIGGRAPH},
year={1991}
}

This paper presents a rapid hierarchical radiosity algorithm for illuminating scenes containing large polygonal patches. The algorithm constructs a hierarchical representation of the form factor matrix by adaptively subdividing patches into subpatches according to a user-supplied error bound. The algorithm guarantees that all form factors are calculated to the same precision, removing many common image artifacts due to inaccurate form factors. More importantly, the algorithm decomposes the formâ€¦Â CONTINUE READING