Residual Path Integrals for Re-rendering
| dc.contributor.author | Xu, Bing | en_US |
| dc.contributor.author | Li, Tzu-Mao | en_US |
| dc.contributor.author | Georgiev, Iliyan | en_US |
| dc.contributor.author | Hedstrom, Trevor | en_US |
| dc.contributor.author | Ramamoorthi, Ravi | en_US |
| dc.contributor.editor | Garces, Elena | en_US |
| dc.contributor.editor | Haines, Eric | en_US |
| dc.date.accessioned | 2024-06-25T10:19:58Z | |
| dc.date.available | 2024-06-25T10:19:58Z | |
| dc.date.issued | 2024 | |
| dc.description.abstract | Conventional rendering techniques are primarily designed and optimized for single-frame rendering. In practical applications, such as scene editing and animation rendering, users frequently encounter scenes where only a small portion is modified between consecutive frames. In this paper, we develop a novel approach to incremental re-rendering of scenes with dynamic objects, where only a small part of a scene moves from one frame to the next. We formulate the difference (or residual) in the image between two frames as a (correlated) light-transport integral which we call the residual path integral. Efficient numerical solution of this integral then involves (1) devising importance sampling strategies to focus on paths with non-zero residual-transport contributions and (2) choosing appropriate mappings between the native path spaces of the two frames. We introduce a set of path importance sampling strategies that trace from the moving object(s) which are the sources of residual energy. We explore path mapping strategies that generalize those from gradient-domain path tracing to our importance sampling techniques specially for dynamic scenes. Additionally, our formulation can be applied to material editing as a simpler special case. We demonstrate speed-ups over previous correlated sampling of path differences and over rendering the new frame independently. Our formulation brings new insights into the re-rendering problem and paves the way for devising new types of sampling techniques and path mappings with different trade-offs. | en_US |
| dc.description.number | 4 | |
| dc.description.sectionheaders | Global Illumination | |
| dc.description.seriesinformation | Computer Graphics Forum | |
| dc.description.volume | 43 | |
| dc.identifier.doi | 10.1111/cgf.15152 | |
| dc.identifier.issn | 1467-8659 | |
| dc.identifier.pages | 14 pages | |
| dc.identifier.uri | https://doi.org/10.1111/cgf.15152 | |
| dc.identifier.uri | https://diglib.eg.org/handle/10.1111/cgf15152 | |
| dc.publisher | The Eurographics Association and John Wiley & Sons Ltd. | en_US |
| dc.title | Residual Path Integrals for Re-rendering | en_US |