Volumetric Multi-View Rendering

dc.contributor.authorFraboni, Basileen_US
dc.contributor.authorWebanck, Antoineen_US
dc.contributor.authorBonneel, Nicolasen_US
dc.contributor.authorIehl, Jean-Claudeen_US
dc.contributor.editorChaine, Raphaëlleen_US
dc.contributor.editorKim, Min H.en_US
dc.date.accessioned2022-04-22T06:29:10Z
dc.date.available2022-04-22T06:29:10Z
dc.date.issued2022
dc.description.abstractRendering photo-realistic images using Monte Carlo path tracing often requires sampling a large number of paths to reach acceptable levels of noise. This is particularly the case when rendering participating media, that complexify light paths with multiple scattering events. Our goal is to accelerate the rendering of heterogeneous participating media by exploiting redundancy across views, for instance when rendering animated camera paths, motion blur in consecutive frames or multi-view images such as lenticular or light-field images. This poses a challenge as existing methods for sharing light paths across views cannot handle heterogeneous participating media and classical estimators are not optimal in this context. We address these issues by proposing three key ideas. First, we propose new volume shift mappings to transform light paths from one view to another within the recently introduced null-scattering framework, taking into account changes in density along the transformed path. Second, we generate a shared path suffix that best contributes to a subset of views, thus effectively reducing variance. Third, we introduce the multiple weighted importance sampling estimator that benefits from multiple importance sampling for combining sampling strategies, and from weighted importance sampling for reducing the variance due to non contributing strategies. We observed significant reuse when views largely overlap, with no visible bias and reduced variance compared to regular path tracing at equal time. Our method further readily integrates into existing volumetric path tracing pipelines.en_US
dc.description.number2
dc.description.sectionheadersRendering II
dc.description.seriesinformationComputer Graphics Forum
dc.description.volume41
dc.identifier.doi10.1111/cgf.14481
dc.identifier.issn1467-8659
dc.identifier.pages379-392
dc.identifier.pages14 pages
dc.identifier.urihttps://doi.org/10.1111/cgf.14481
dc.identifier.urihttps://diglib.eg.org:443/handle/10.1111/cgf14481
dc.publisherThe Eurographics Association and John Wiley & Sons Ltd.en_US
dc.subjectCCS Concepts: Computing methodologies --> Computer graphics; Ray tracing; Visibility
dc.subjectComputing methodologies
dc.subjectComputer graphics
dc.subjectRay tracing
dc.subjectVisibility
dc.titleVolumetric Multi-View Renderingen_US
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