A rapid hierarchical radiosity algorithm

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A rapid hierarchical radiosity algorithm

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International Conference on Computer Graphics and Interactive Techniques archive
Proceedings of the 18th annual conference on Computer graphics and interactive techniques table of contents

Pages: 197 - 206

Year of Publication: 1991

ISBN:0-89791-436-8

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Authors

Pat Hanrahan	Department of Computer Science, Princeton University, Princeton, NJ
David Salzman	68 Francis Avenue, Cambridge, MA
Larry Aupperle	Department of Computer Science, Princeton University, Princeton, NJ

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SIGGRAPH: ACM Special Interest Group on Computer Graphics and Interactive Techniques

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ACM New York, NY, USA

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Downloads (6 Weeks): 10, Downloads (12 Months): 113, Citation Count: 106

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ABSTRACT

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 form factor matrix into at most O(n) blocks (where n is the number of elements). Previous radiosity algorithms represented the element-to-element transport interactions with n² form factors. Visibility algorithms are given that work well with this approach. Standard techniques for shooting and gathering can be used with the hierarchical representation to solve for equilibrium radiosities, but we also discuss using a brightness-weighted error criteria, in conjunction with multigridding, to even more rapidly progressively refine the image.

REFERENCES

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