Implicit representation of inscribed volumes
Date
2017-05-01
Authors
Sahbaei, Parto
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Abstract
We present an implicit approach for constructing smooth isolated or interconnected 3-D inscribed volumes which can be employed for volumetric modeling of various kinds of spongy or porous structures, such as volcanic rocks, pumice stones, Cancellus bones *, liquid or dry foam, radiolarians, cheese, and other similar materials. The inscribed volumes can be represented in their normal or positive forms to model natural pebbles or pearls, or in their inverted or negative forms to be used in porous structures, but regardless of their types, their smoothness and sizes are controlled by the user without losing the consistency of the shapes. We introduce two techniques for blending and creating interconnections between these inscribed volumes to achieve a great flexibility to adapt our approach to different types of porous structures, whether they are regular or irregular. We begin with a set of convex polytopes such as 3-D Voronoi diagram cells and compute inscribed volumes bounded by the cells. The cells can be irregular in shape, scale, and topology, and this irregularity transfers to the inscribed volumes, producing natural-looking spongy structures. Describing the inscribed volumes with implicit functions gives us a freedom to exploit
volumetric surface combinations and deformations operations effortlessly
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Keywords
Marching Cubes, Implicit Modeling, Inscribed Volumes, Marching Tetra-hedra, Extended Marching Cubes, Dual Marching Cubes, Dual Contouring, Spline, Inscribed Curves, Subsurface Scattering, Laguerre tessellation, Radiolarians, Voronoi Diagram, The BlobTree, Octree, porous surfaces, spongy surfaces, Polytopes