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CGF
2011

RTSAH Traversal Order for Occlusion Rays

7 years 10 months ago
RTSAH Traversal Order for Occlusion Rays
We accelerate the finding of occluders in tree based acceleration structures, such as a packetized BVH and a single ray kd-tree, by deriving the ray termination surface area heuristic (RTSAH) cost model for traversing an occlusion ray through a tree and then using the RTSAH to determine which child node a ray should traverse first instead of the traditional choice of traversing the near node before the far node. We further extend RTSAH to handle materials that attenuate light instead of fully occluding it, so that we can avoid superfluous intersections with partially transparent objects. For scenes with high occlusion, we substantially lower the number of traversal steps and intersection tests and achieve up to 2× speedups.
Thiago Ize, Charles D. Hansen
Added 25 Aug 2011
Updated 25 Aug 2011
Type Journal
Year 2011
Where CGF
Authors Thiago Ize, Charles D. Hansen
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