Irradiance gradients
- Lawrence Berkeley Lab., CA (United States)
- Carnegie-Mellon Univ., Pittsburgh, PA (United States). School of Computer Science
A new method for improving the accuracy of a diffuse interreflection calculation is introduced in a ray tracing context. The information from a hemispherical sampling of the luminous environment is interpreted in a new way to predict the change in irradiance as a function of position and surface orientation. The additional computation involved is modest and the benefit is substantial. An improved interpolation of irradiance resulting from the gradient calculation produces smoother, more accurate renderings. This result is achieved through better utilization of ray samples rather than additional samples or alternate sampling strategies. Thus, the technique is applicable to a variety of global illumination algorithms that use hemicubes or Monte Carlo sampling techniques.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States); Ecole Polytechnique Federale, Lausanne (Switzerland); Technische Hogeschool Delft (Netherlands). Dept. of Technical Mathematics and Informatics
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10133703
- Report Number(s):
- LBL-32205; CONF-9205308-1; ON: DE93007657; IN: L-163
- Resource Relation:
- Conference: 3. Eurographics on rendering workshop,Bristol (United Kingdom),18-20 May 1992; Other Information: PBD: Apr 1992
- Country of Publication:
- United States
- Language:
- English
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