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Illustrations of boundaries of a spherical domain extracted using (a) voxel representation, and marching-cubes (b) without and (c) with smoothing by a Gaussian-filter. Zoom-in views of the surfaces in (b) and (c) can be found in (d) and (e), respectively. We also show diagrams explaining (f) ray-tracing computation and (g) our extended voxel data memory layout that encodes additional shape information.
