Kollig, ThomasKeller, AlexanderPhilip Dutre and Frank Suykens and Per H. Christensen and Daniel Cohen-Or2014-01-272014-01-2720033-905673-03-71727-3463https://doi.org/10.2312/EGWR/EGWR03/045-051We present an algorithm for determining quadrature rules for computing the direct illumination of predominantly diffuse objects by high dynamic range images. The new method precisely reproduces fine shadow detail, is much more efficient as compared to Monte Carlo integration, and does not require any manual intervention.