Two-stage Resampling for Bidirectional Path Tracing with Multiple Light Sub-paths
| dc.contributor.author | Nabata, Kosuke | en_US |
| dc.contributor.author | Iwasaki, Kei | en_US |
| dc.contributor.author | Dobashi, Yoshinori | en_US |
| dc.contributor.editor | Eisemann, Elmar and Jacobson, Alec and Zhang, Fang-Lue | en_US |
| dc.date.accessioned | 2020-10-29T18:50:42Z | |
| dc.date.available | 2020-10-29T18:50:42Z | |
| dc.date.issued | 2020 | |
| dc.description.abstract | Recent advances in bidirectional path tracing (BPT) reveal that the use of multiple light sub-paths and the resampling of a small number of these can improve the efficiency of BPT. By increasing the number of pre-sampled light sub-paths, the possibility of generating light paths that provide large contributions can be better explored and this can alleviate the correlation of light paths due to the reuse of pre-sampled light sub-paths by all eye sub-paths. The increased number of pre-sampled light subpaths, however, also incurs a high computational cost. In this paper, we propose a two-stage resampling method for BPT to efficiently handle a large number of pre-sampled light sub-paths. We also derive a weighting function that can treat the changes in path probability due to the two-stage resampling. Our method can handle a two orders of magnitude larger number of presampled light sub-paths than previous methods in equal-time rendering, resulting in stable and better noise reduction than state-of-the-art methods. | en_US |
| dc.description.number | 7 | |
| dc.description.sectionheaders | Lights and Ray Tracing | |
| dc.description.seriesinformation | Computer Graphics Forum | |
| dc.description.volume | 39 | |
| dc.identifier.doi | 10.1111/cgf.14139 | |
| dc.identifier.issn | 1467-8659 | |
| dc.identifier.pages | 219-230 | |
| dc.identifier.uri | https://doi.org/10.1111/cgf.14139 | |
| dc.identifier.uri | https://diglib.eg.org:443/handle/10.1111/cgf14139 | |
| dc.publisher | The Eurographics Association and John Wiley & Sons Ltd. | en_US |
| dc.subject | Computing methodologies | |
| dc.subject | Computer graphics | |
| dc.subject | Ray tracing | |
| dc.title | Two-stage Resampling for Bidirectional Path Tracing with Multiple Light Sub-paths | en_US |