Marcelo de Gomensoro Malheiros,  Shin-Ting Wu. 

Implicit modeling is a recent trend in Computer Graphics and a variety of skeleton-based models has been proposed. In this paper we present a hierarchical framework that can encompass a wide range of these variants, providing a more flexible way for defining the shape of implicit objects. We also derive a new decay function, which is computationally cheap.

http://sibgrapi.sid.inpe.br/rep-/dpi.inpe.br/ambro/1998/05.22.14.27

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