Wavelet Point-Based Global Illumination

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dc.contributor.authorWang, Beibeien_US
dc.contributor.authorMeng, Xiangxuen_US
dc.contributor.authorBoubekeur, Tamyen_US
dc.contributor.editorJaakko Lehtinen and Derek Nowrouzezahraien_US
dc.date.accessioned2015-06-23T04:49:09Z
dc.date.available2015-06-23T04:49:09Z
dc.date.issued2015en_US
dc.description.abstractPoint-Based Global Illumination (PBGI) is a popular rendering method in special effects and motion picture productions. This algorithm provides a diffuse global illumination solution by caching radiance in a mesh-less hierarchical data structure during a pre-process, while solving for visibility over this cache, at rendering time and for each receiver, using microbuffers, which are localized depth and color buffers inspired from real time rendering environments. As a result, noise free ambient occlusion, indirect soft shadows and color bleeding effects are computed efficiently for high resolution image output and in a temporally coherent fashion. We propose an evolution of this method to address the case of non-diffuse inter-reflections and refractions. While the original PBGI algorithm models radiance using spherical harmonics, we propose to use wavelets parameterized on the direction space to better localize the radiance representation in the presence of highly directional reflectance. We also propose a new importance-driven adaptive microbuffer model to capture accurately incoming radiance at a point. Furthermore, we evaluate outgoing radiance using a fast wavelet radiance product and contain the induced larger memory footprint by encoding hierarchically the wavelets in the PBGI tree. As a result, our algorithm can handle non-lambertian BSDF in the light transport simulation, reproducing caustics and multiple reflections/refractions bounces with a similar quality to bidirectional path tracing in a large number of cases and for only a fraction of its computation time. Our approach is simple to implement and easy to integrate into any existing PBGI framework, with an intuitive control on the approximation error. We evaluate it on a collection of example scenes.en_US
dc.description.number4en_US
dc.description.sectionheadersReal-time Rendering and Filteringen_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.description.volume34en_US
dc.identifier.doi10.1111/cgf.12686en_US
dc.identifier.pages143-153en_US
dc.identifier.urihttps://doi.org/10.1111/cgf.12686en_US
dc.publisherThe Eurographics Association and John Wiley & Sons Ltd.en_US
dc.titleWavelet Point-Based Global Illuminationen_US
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34-Issue 4
EGSR15: 26th Eurographics Symposium on Rendering