The Determination of Form-Factors by Lookup Table

dc.contributor.authorSun, Jizhouen_US
dc.contributor.authorZou, L.Q.en_US
dc.contributor.authorGrimsdale, R.L.en_US
dc.date.accessioned2014-10-21T07:26:55Z
dc.date.available2014-10-21T07:26:55Z
dc.date.issued1993en_US
dc.description.abstractCurrent 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.en_US
dc.description.number4en_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.description.volume12en_US
dc.identifier.doi10.1111/1467-8659.1240191en_US
dc.identifier.issn1467-8659en_US
dc.identifier.pages191-198en_US
dc.identifier.urihttps://doi.org/10.1111/1467-8659.1240191en_US
dc.publisherBlackwell Science Ltd and the Eurographics Associationen_US
dc.titleThe Determination of Form-Factors by Lookup Tableen_US
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