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Fast HDR Image-Based Lighting Using Summed-Area Tables

We introduce a technique that uses summed-area tables to dynamically compute image-based lighting from highdynamic-range environment maps. A combination of first order and second order summed-area tables are used to approximate various BRDFs such as the Phong BRDF. A key feature of the approach is “offsetting” of the original image with respect to its mean, in order to significantly increase the precision of our computation. On current graphics hardware, we are able to render at over 40 frames per second while still re-computing all necessary summed-area tables on the fly to allow for dynamic lighting. When the environment map is static, we are able to render at over 130 frames per second, but still allow for dynamic, spatially varying filtering of the static environment map.