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This integrator serves mainly as a debugging tool to authors of Bxdf plugins. The 3 channels of the output are the luminance results for total hemispherical reflectance, computed in three different ways:


If the Bxdf is given "white" values and is correct, the resulting image should converge to all white pixels. Energy lost (either due to explicit absorption or due to the bxdf model losing energy) or gained shows up as non-white pixels. Bxdf authors should take care to observe what happens at grazing angles, as that can be a good place to lose energy. 


int numSamplesThe number of Bxdf samples to generate and evaluate per ray. The default value is 4.