Hardware-Accelerated Global Illumination by Image Space Photon Mapping

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Date
2009
Authors
McGuire, Morgan
Luebke, David
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
We describe an extension to photon mapping that recasts the most expensive steps of the algorithm - the initial and final photon bounces - as image-space operations amenable to GPU acceleration. This enables global illumination for real-time applications as well as accelerating it for offline rendering. Image Space Photon Mapping (ISPM) rasterizes a light-space bounce map of emitted photons surviving initial-bounce Russian roulette sampling on a GPU. It then traces photons conventionally on the CPU. Traditional photon mapping estimates final radiance by gathering photons from a k-d tree. ISPM instead scatters indirect illumination by rasterizing an array of photon volumes. Each volume bounds a filter kernel based on the a priori probability density of each photon path. These two steps exploit the fact that initial path segments from point lights and final ones into a pinhole camera each have a common center of projection. An optional step uses joint bilateral upsampling of irradiance to reduce the fill requirements of rasterizing photon volumes. ISPM preserves the accurate and physically-based nature of photon mapping, supports arbitrary BSDFs, and captures both high- and low-frequency illumination effects such as caustics and diffuse color interreflection. An implementation on a consumer GPU and 8-core CPU renders highquality global illumination at up to 26 Hz at HD (1920-1080) resolution, for complex scenes containing moving objects and lights.
Description

        
@inproceedings{
:10.1145/1572769.1572783
,
booktitle = {
High-Performance Graphics
},
editor = {
David Luebke and Philipp Slusallek
},
title = {{
Hardware-Accelerated Global Illumination by Image Space Photon Mapping
}},
author = {
McGuire, Morgan
 and 
Luebke, David
},
year = {
2009
},
publisher = {
The Eurographics Association
},
ISSN = {
2079-8687
},
ISBN = {
978-1-60558-603-8
},
DOI = {
/10.1145/1572769.1572783
}
}
Citation
URI
https://doi.org/10.1145/1572769.1572783
Collections
High-Performance Graphics 2009