Research

PantaRay: Fast Ray-traced Occlusion Caching of Massive Scenes

"PantaRay: Fast Ray-traced Occlusion Caching of Massive Scenes"
Jacopo Pantaleoni (NVIDIA), Luca Fascione (Weta Digital Ltd), Timo Aila, Martin Hill (Weta Digital Ltd), in Siggraph 2010 (In Proceedings of ACM Siggraph 2010), July 2010
Research Area: Ray Tracing
Author(s): Jacopo Pantaleoni (NVIDIA), Luca Fascione (Weta Digital Ltd), Timo Aila, Martin Hill (Weta Digital Ltd)
Date: July 2010
Download(s):
 
Abstract: 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.