Luiz Velho,  Jonas Gomes. 

This paper present a new scheme for subdivision surfaces that is based on four-directional meshes. It combines geometry-sensitive refinement with convolution smoothing. The scheme has a simple, efficient implementation and generates well-shaped meshes which converge to smooth surfaces.

http://sibgrapi.sid.inpe.br/rep-/dpi.inpe.br/vagner/1999/11.26.16.50

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