Title: Polyhedral Modeling (G.P. Bonneau, S. Hahmann)
Polyhedral meshes are used for visualization, computer graphics or
geometric modeling purposes and result from many applications like iso-surface extraction,
surface reconstruction or CAD/CAM.
The present paper introduces a method for constructing smooth surfaces from
a triangulated polyhedral mesh of arbitrary topology. It presents a new
algorithm which generalizes and improves the triangle 4-split method 
in the crucial point of boundary curve network construction.
This network is then filled-in by a visual smooth surface from which an explicit
closed form parametrization is given. Furthermore, the
method becomes now completely local and can interpolate normal vector input at the
 S. Hahmann S., G.P. Bonnneau, Triangular G1 Interpolation by 4-splitting domain triangles,
Computer Aided Geometric Design, Volume 17, Issue 8, pp. 1-22, Sep. 2000.
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