“Second-Order Occlusion-Aware Volumetric Radiance Caching” by Marco, Jarabo, Jarosz and Gutierrez

  • ©Julio Marco, Adrian Jarabo, Wojciech Jarosz, and Diego Gutierrez

  • ©Julio Marco, Adrian Jarabo, Wojciech Jarosz, and Diego Gutierrez



Entry Number: 48


    Second-Order Occlusion-Aware Volumetric Radiance Caching

Session/Category Title: Volume Rendering and Global Illumination




    Accurate simulation of light transport in participating media is expensive, due to the many scattering events. However, the band-limiting effect of scattering in media makes this kind of light transport very suitable for adaptive sampling and reconstruction techniques. In this work we present a novel algorithm that adaptively samples radiance from sparse points in the medium using up-to second-order occlusion-aware derivatives to determine when interpolation is appropriate. We derive our metric from each point’s incoming light field. We use a proxy triangulation-based representation of the radiance reflected by the surrounding medium and geometry to efficiently compute the first- and second-order derivatives of the radiance at the cache points while accounting for occlusion changes. We validate the quality of our approach on a self-contained two-dimensional model for light transport in media. Then we show how our results generalize to practical three-dimensional scenarios, where we show much better results while reducing computation time up to a 30% compared to previous work.



    This research has been funded by by DARPA (project REVEAL), an ERC Consolidator Grant (project CHAMELEON), the Spanish Ministry of Economy and Competitiveness (projects TIN2016-78753- P and TIN2016-79710-P), and the Gobierno de Aragón.


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