%0 Conference Paper %1 McGuire:Luebke:2009 %A McGuire, Morgan %A Luebke, David %B Proceedings of the Conference on High Performance Graphics 2009 %C New York, NY, USA %D 2009 %I ACM %K indirect_lighting photon_mapping screenspace %P 77--89 %R 10.1145/1572769.1572783 %T Hardware-accelerated Global Illumination by Image Space Photon Mapping %X 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 (1920x1080) resolution, for complex scenes containing moving objects and lights. %@ 978-1-60558-603-8

@inproceedings{McGuire:Luebke:2009, 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 (1920x1080) resolution, for complex scenes containing moving objects and lights.}, acmid = {1572783}, added-at = {2015-10-11T19:24:08.000+0200}, address = {New York, NY, USA}, author = {McGuire, Morgan and Luebke, David}, biburl = {https://www.bibsonomy.org/bibtex/260395bed256741b62199bf67d8a21f6f/ledood}, booktitle = {Proceedings of the Conference on High Performance Graphics 2009}, description = {Hardware-accelerated global illumination by image space photon mapping}, doi = {10.1145/1572769.1572783}, interhash = {9b4f9b6b25d190f976c5c71c53474916}, intrahash = {60395bed256741b62199bf67d8a21f6f}, isbn = {978-1-60558-603-8}, keywords = {indirect_lighting photon_mapping screenspace}, location = {New Orleans, Louisiana}, numpages = {13}, pages = {77--89}, publisher = {ACM}, series = {HPG '09}, timestamp = {2016-04-29T15:45:41.000+0200}, title = {Hardware-accelerated Global Illumination by Image Space Photon Mapping}, year = 2009 }