SIGGRAPH '86 Proceedings of the 13th annual conference on Computer graphics and interactive techniques
Linear radiosity approximation using vertex-to-vertex form factors
Graphics Gems III
Simulating global illumination using adaptive meshing
Simulating global illumination using adaptive meshing
An improved illumination model for shaded display
Communications of the ACM
A ray tracing solution for diffuse interreflection
SIGGRAPH '88 Proceedings of the 15th annual conference on Computer graphics and interactive techniques
Improving Sampling and Reconstruction Techniques for Radiosity
Improving Sampling and Reconstruction Techniques for Radiosity
Finite Element Methods for Global Illumination
Finite Element Methods for Global Illumination
Spatio-Temporal Filtering of Indirect Lighting for Interactive Global Illumination
Computer Graphics Forum
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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.