The Determination of Form-Factors by Lookup Table
| dc.contributor.author | Sun, Jizhou | en_US |
| dc.contributor.author | Zou, L.Q. | en_US |
| dc.contributor.author | Grimsdale, R.L. | en_US |
| dc.date.accessioned | 2014-10-21T07:26:55Z | |
| dc.date.available | 2014-10-21T07:26:55Z | |
| dc.date.issued | 1993 | en_US |
| dc.description.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. | en_US |
| dc.description.number | 4 | en_US |
| dc.description.seriesinformation | Computer Graphics Forum | en_US |
| dc.description.volume | 12 | en_US |
| dc.identifier.doi | 10.1111/1467-8659.1240191 | en_US |
| dc.identifier.issn | 1467-8659 | en_US |
| dc.identifier.pages | 191-198 | en_US |
| dc.identifier.uri | http://dx.doi.org/10.1111/1467-8659.1240191 | en_US |
| dc.publisher | Blackwell Science Ltd and the Eurographics Association | en_US |
| dc.title | The Determination of Form-Factors by Lookup Table | en_US |