Adaptive Sampling in the Age of Unbiased Rendering by Edwin Braun

Great care was taken to bring adaptive sampling methods to finalRender without introducing any bias in rendering. finalRender stays true to its physically accurate unbiased approach of spectral based rendering, even when adaptive sampling is turned on. This is possible because of how finalRender interprets adaptive sampling, calculated pixels are never changed or interpolated. The only thing finalRender does in its adaptive process is to skip processing for certain pixels that fall within a threshold. To overcome the bias pitfall, finalRender allows to recalculate any pixel after several passes even those pixels that have been skipped before so they can fall back into the threshold and become processed for some passes until ruled to be fully converged. finalRender works within a complex "feedback loop" to generate the most realistic and physically correct rendering result in the least amount of time. cebas.com/finalRender