Scaffolding a Skeleton

Abstract : The goal of this paper is to construct a quadrilateral mesh around a one-dimensional skeleton that is as coarse as possible, the " scaffold ". A skeleton allows one to quickly describe a shape, in particular a complex shape of high genus. The constructed scaffold is then a potential support for the surface representation: it provides a topology for the mesh, a domain for parametric representation (a quad mesh is ideal for tensor product splines) or, together with the skeleton, a grid support on which to project an implicit surface that is naturally defined by the skeleton through convolution. We provide a constructive algorithm to derive a quad-mesh scaffold with topologically regular cross-sections (which are also quads), and no T-junctions. We show that this construction is optimal in the sense that no coarser quad mesh with topologically regular cross-sections may be constructed. Finally, we apply an existing rotation minimization algorithm along the skeleton branches, which produces a mesh with a natural edge flow along the shape.
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Athina Panotopoulou, Elissa Ross, Kathrin Welker, Evelyne Hubert, Geraldine Morin. Scaffolding a Skeleton. Research in Shape Analysis , Springer, 2018, Research in Shape Analysis, ⟨10.1007/978-3-319-77066-6_2⟩. ⟨hal-01532765v2⟩

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