Technical Papers
Scalable Appearance Filtering for Complex Lighting Effects
Event Type
Technical Papers
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TimeWednesday, 5 December 20189:42am - 10:03am
DescriptionRealistic rendering with materials that exhibit high-frequency spatial variation remains a challenge, as eliminating spatial and temporal aliasing requires prohibitively high sampling rates. Recent work has made the problem more tractable, however existing methods remain prohibitively expensive when using large environmental lights and/or (correctly filtered) global illumination. We present an appearance model with explicit high-frequency micro-normal variation, and a filtering approach that scales to multi-dimensional shading integrals. By combining a novel and compact half-vector histogram scheme with a directional basis expansion, we accurately compute the integral of filtered high-frequency reflectance over large lights with angularly varying emission. Our approach is scalable, rendering images indistinguishable from ground truth at over $\mathbf{10\times}$ the speed of the state-of-the-art and with only $\mathbf{15\%}$ the memory footprint. When filtering appearance with global illumination, we outperform the state-of-the-art by $\sim\! \mathbf{30\times}$.