Harmonics Virtual Lights: Fast Projection of Luminance Field on Spherical Harmonics for Efficient Rendering

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dc.contributor.authorMézières, Pierreen_US
dc.contributor.authorDesrichard, Françoisen_US
dc.contributor.authorVanderhaeghe, Daviden_US
dc.contributor.authorPaulin, Mathiasen_US
dc.contributor.editorHauser, Helwig and Alliez, Pierreen_US
dc.date.accessioned2022-10-11T05:24:56Z
dc.date.available2022-10-11T05:24:56Z
dc.date.issued2022
dc.description.abstractIn this paper, we introduce harmonics virtual lights (HVL), to model indirect light sources for interactive global illumination of dynamic 3D scenes. Virtual point lights (VPL) are an efficient approach to define indirect light sources and to evaluate the resulting indirect lighting. Nonetheless, VPL suffer from disturbing artefacts, especially with high‐frequency materials. Virtual spherical lights (VSL) avoid these artefacts by considering spheres instead of points but estimates the lighting integral using Monte‐Carlo which results to noise in the final image. We define HVL as an extension of VSL in a spherical harmonics (SH) framework, defining a closed form of the lighting integral evaluation. We propose an efficient SH projection of spherical lights contribution faster than existing methods. Computing the outgoing luminance requires operations when using materials with circular symmetric lobes, and operations for the general case, where is the number of SH bands. HVL can be used with either parametric or measured BRDF without extra cost and offers control over rendering time and image quality, by either decreasing or increasing the band limit used for SH projection. Our approach is particularly well‐designed to render medium‐frequency one‐bounce global illumination with arbitrary BRDF at an interactive frame rate.en_US
dc.description.number6
dc.description.sectionheadersArticles
dc.description.seriesinformationComputer Graphics Forum
dc.description.volume41
dc.identifier.doi10.1111/cgf.14564
dc.identifier.issn1467-8659
dc.identifier.pages182-195
dc.identifier.urihttps://doi.org/10.1111/cgf.14564
dc.identifier.urihttps://diglib.eg.org:443/handle/10.1111/cgf14564
dc.publisher© 2022 Eurographics ‐ The European Association for Computer Graphics and John Wiley & Sons Ltd.en_US
dc.subjectglobal illumination
dc.subjectreal‐time
dc.subjectspherical harmonics
dc.titleHarmonics Virtual Lights: Fast Projection of Luminance Field on Spherical Harmonics for Efficient Renderingen_US
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