Hardware-Accelerated Global Illumination by Image Space Photon Mapping
| dc.contributor.author | McGuire, Morgan | en_US |
| dc.contributor.author | Luebke, David | en_US |
| dc.contributor.editor | David Luebke and Philipp Slusallek | en_US |
| dc.date.accessioned | 2013-10-29T15:48:17Z | |
| dc.date.available | 2013-10-29T15:48:17Z | |
| dc.date.issued | 2009 | en_US |
| dc.description.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. | en_US |
| dc.description.seriesinformation | High-Performance Graphics | en_US |
| dc.identifier.isbn | 978-1-60558-603-8 | en_US |
| dc.identifier.issn | 2079-8687 | en_US |
| dc.identifier.uri | https://doi.org/10.1145/1572769.1572783 | en_US |
| dc.publisher | The Eurographics Association | en_US |
| dc.title | Hardware-Accelerated Global Illumination by Image Space Photon Mapping | en_US |