Factorization of BRDF-based Lighting Computation

Distribution Functions (BRDF) with acceptable quality and performance for
real-time applications. Based on the recently published "Homomorphic
Factorization" by McCool et al. a new technique has been developed, that does
not approximate the BRDF, but instead the full lighting computation of an
isotropic BRDF in a global illumination scenario. With this method materials in
complex lighting situations can be simulated with only two or more textures by
using commonly available computation capabilities of current graphics hardware.
This technique can also be considered as a generalized approach to several
environment map prefiltering techniques.