Separating
Reflection
Functions for
Linear
Radiosity
Alain
Fournier
Appeared in Eurographics Workshop on Rendering 1995 (pp. 296-305; Dublin,
Ireland)
TR-95-25
We show here that this can be easily extended to BRDFs that can be approximated by sums of such terms. The classic technique of Singular Value Decomposition (SVD) can be used to compute those terms given an analytical or experimental BRDF. We use the example of the traditional Phong model for specular-like reflection to extract a separable model, and show the results in terms of closeness to ordinary Phong shading. We also show an example with experimental BRDF data. Further work will indicate whether the quality of linear radiosity images will be improved by this modification.