The Determination of Form-Factors by Lookup Table
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Date
1993
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Blackwell Science Ltd and the Eurographics Association
Abstract
Current methods for computer image synthesis using the radiosity algorithm rely heavily on the calculation of geometrical properties, known as form-factors, which quantify the energy exchange between pairs of surfaces in the environment. In this paper, a new method for form-factor calculation is presented, in which form-factors from a differential area to a finite area with various geometric orientations and dimensions can be determined by the summation of three weighted directional form-factors. The three directional form-factors are mutually independent and can be pre-calculated and stored in a lookup table accessed by two indices. Thus, the determination of the generally used complex form-factor integral is greatly simplified and mainly replaced by accessing a pre-established lookup table. Quantitative comparisons of Wallace s ray casting method and the method presented indicate that the new method can provide more accurate form-factors, which implies that the number of sample points necessary on each source patch is comparatively reduced and the process of form-factor calculation can be accelerated.
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@article{10.1111:1467-8659.1240191,
journal = {Computer Graphics Forum},
title = {{The Determination of Form-Factors by Lookup Table}},
author = {Sun, Jizhou and Zou, L.Q. and Grimsdale, R.L.},
year = {1993},
publisher = {Blackwell Science Ltd and the Eurographics Association},
ISSN = {1467-8659},
DOI = {10.1111/1467-8659.1240191}
}