Temporal Photon Differentials

Lars Schjøth, Jeppe Revall Frisvad, Kenny Erleben, Jon Sporring

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    The finite frame rate also used in computer animated films is cause of adverse temporal aliasing effects. Most noticeable of these is a stroboscopic effect that is seen as intermittent movement of fast moving illumination. This effect can be mitigated using non-zero shutter times, effectively, constituting a temporal smoothing of rapidly changing illumination. In global illumination temporal smoothing can be achieved with distribution ray tracing (Cook et al., 1984). Unfortunately, this, and resembling methods, requires a high temporal resolution as samples has to be drawn from in-between frames. We present a novel method which is able to produce high quality temporal smoothing for indirect illumination without using in-between frames. Our method is based on ray differentials (Igehy, 1999) as it has been extended in (Sporring et al., 2009). Light rays are traced as bundles creating footprints, which are used to reconstruct indirect illumination. These footprints expand into the temporal domain such that light rays interacting with non-static scene elements draw a path reacting to the elements movement.
    Original languageEnglish
    Title of host publicationProceedings of GRAPP 2010 : 5th International Conference on Computer Graphics Theory and Applications
    Publication date2010
    ISBN (Print)978-989-674-026-9
    Publication statusPublished - 2010
    Event5th International Conference on Computer Graphics Theory and Applications (GRAPP) - Angers, France
    Duration: 17 May 201021 May 2010


    Conference5th International Conference on Computer Graphics Theory and Applications (GRAPP)
    Internet address


    • first order structure
    • photon mapping
    • ray differentials


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