HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Glossy Probe Reprojection for Interactive Global Illumination

Abstract : Recent rendering advances dramatically reduce the cost of global illumination. But even with hardware acceleration, complex light paths with multiple glossy interactions are still expensive; our new algorithm stores these paths in precomputed light probes and reprojects them at runtime to provide interactivity. Combined with traditional light maps for diffuse lighting our approach interactively renders all light paths in static scenes with opaque objects. Naively reprojecting probes with glossy lighting is memory-intensive, requires efficient access to the correctly reflected radiance, and exhibits problems at occlusion boundaries in glossy reflections. Our solution addresses all these issues. To minimize memory, we introduce an adaptive light probe parameterization that allocates increased resolution for shinier surfaces and regions of higher geometric complexity. To efficiently sample glossy paths, our novel gathering algorithm reprojects probe texels in a view-dependent manner using efficient reflection estimation and a fast rasterization-based search. Naive probe reprojection often sharpens glossy reflections at occlusion boundaries, due to changes in parallax. To avoid this, we split the convolution induced by the BRDF into two steps: we precompute probes using a lower material roughness and apply an adaptive bilateral filter at runtime to reproduce the original surface roughness. Combining these elements, our algorithm interactively renders complex scenes while fitting in the memory, bandwidth, and computation constraints of current hardware.
Document type :
Journal articles
Complete list of metadata

Cited literature [67 references]  Display  Hide  Download

Contributor : Team Reves Connect in order to contact the contributor
Submitted on : Friday, September 4, 2020 - 4:23:09 PM
Last modification on : Thursday, January 20, 2022 - 5:32:47 PM
Long-term archiving on: : Friday, December 4, 2020 - 11:00:56 PM


Files produced by the author(s)




Simon Rodriguez, Thomas Leimkühler, Siddhant Prakash, Chris Wyman, Peter Shirley, et al.. Glossy Probe Reprojection for Interactive Global Illumination. ACM Transactions on Graphics, Association for Computing Machinery, 2020, ⟨10.1145/3414685.3417823⟩. ⟨hal-02930925⟩



Record views


Files downloads