IEEE Trans Vis Comput Graph - VisibilityCluster: Average Directional Visibility for Many-Light Rendering.

Tópicos

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Resumo

This paper proposes the VisibilityCluster algorithm for efficient visibility approximation and representation in many-light rendering. By carefully clustering lights and shading points, we can construct a visibility matrix that exhibits good local structures due to visibility coherence of nearby lights and shading points. Average visibility can be efficiently estimated by exploiting the sparse structure of the matrix and shooting only few shadow rays between clusters. Moreover, we can use the estimated average visibility as a quality measure for visibility estimation, enabling us to locally refine VisibilityClusters with large visibility variance for improving accuracy. We demonstrate that, with the proposed method, visibility can be incorporated into importance sampling at a reasonable cost for the many-light problem, significantly reducing variance in Monte Carlo rendering. In addition, the proposed method can be used to increase realism of local shading by adding directional occlusion effects. Experiments show that the proposed technique outperforms state-of-the-art importance sampling algorithms, and successfully enhances the preview quality for lighting design.

Resumo Limpo

paper propos visibilityclust algorithm effici visibl approxim represent manylight render care cluster light shade point can construct visibl matrix exhibit good local structur due visibl coher nearbi light shade point averag visibl can effici estim exploit spars structur matrix shoot shadow ray cluster moreov can use estim averag visibl qualiti measur visibl estim enabl us local refin visibilityclust larg visibl varianc improv accuraci demonstr propos method visibl can incorpor import sampl reason cost manylight problem signific reduc varianc mont carlo render addit propos method can use increas realism local shade ad direct occlus effect experi show propos techniqu outperform stateoftheart import sampl algorithm success enhanc preview qualiti light design

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