Residual Path Integrals for Re-rendering

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dc.contributor.authorXu, Bingen_US
dc.contributor.authorLi, Tzu-Maoen_US
dc.contributor.authorGeorgiev, Iliyanen_US
dc.contributor.authorHedstrom, Trevoren_US
dc.contributor.authorRamamoorthi, Ravien_US
dc.contributor.editorGarces, Elenaen_US
dc.contributor.editorHaines, Ericen_US
dc.date.accessioned2024-06-25T10:19:58Z
dc.date.available2024-06-25T10:19:58Z
dc.date.issued2024
dc.description.abstractConventional 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.number4
dc.description.sectionheadersGlobal Illumination
dc.description.seriesinformationComputer Graphics Forum
dc.description.volume43
dc.identifier.doi10.1111/cgf.15152
dc.identifier.issn1467-8659
dc.identifier.pages14 pages
dc.identifier.urihttps://doi.org/10.1111/cgf.15152
dc.identifier.urihttps://diglib.eg.org/handle/10.1111/cgf15152
dc.publisherThe Eurographics Association and John Wiley & Sons Ltd.en_US
dc.titleResidual Path Integrals for Re-renderingen_US
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