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PantaRay: fast ray-traced occlusion caching of massive scenes

Jacopo Pantaleoni, Luca Fascione, Martin Hill, Timo Aila
NVIDIA Research
ACM Trans. Graph., Vol. 29, No. 4. (2010), pp. 1-10.

@conference{pantaleoni2010pantaray,

   title={PantaRay: fast ray-traced occlusion caching of massive scenes},

   author={Pantaleoni, J. and Fascione, L. and Hill, M. and Aila, T.},

   booktitle={ACM SIGGRAPH 2010 papers},

   pages={1–10},

   year={2010},

   organization={ACM}

}

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We describe the architecture of a novel system for precomputing sparse directional occlusion caches. These caches are used for accelerating a fast cinematic lighting pipeline that works in the spherical harmonics domain. The system was used as a primary lighting technology in the movie Avatar, and is able to efficiently handle massive scenes of unprecedented complexity through the use of a flexible, stream-based geometry processing architecture, a novel out-of-core algorithm for creating efficient ray tracing acceleration structures, and a novel out-of-core GPU ray tracing algorithm for the computation of directional occlusion and spherical integrals at arbitrary points.
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