High-Performance Graphics 2023 - Symposium Papers

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Voxel-based Representations for Improved Filtered Appearance
(The Eurographics Association, 2023) Brito, Caio José Dos Santos; Poulin, Pierre; Teichrieb, Veronica; Bikker, Jacco; Gribble, Christiaan
Volumetric representations allow filtering of mesh-based complex 3D scenes to control both the efficiency and quality of rendering. Unfortunately, directional variations in the visual appearance of a volume still hinder its adoption by the real-time rendering community. To alleviate this problem, we propose two simple structures: (1) a virtual mesh to encode the directional distribution of colors and normals, and (2) a low-resolution subgrid of opacities to encode directional visibility. We precompute these structures from a mesh-based scene into a regular voxelization. During display, we use simple rendering methods on the two structures to compute the image contribution of the appearance of a visible voxel, optimizing for efficiency and/or quality. The improved visual results compared to previous work are a step forward to the integration of volumetric representations in real-time rendering.