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##

Surface Representation

The 3D surface to be discretized is represented by an unstructured triangular
control grid. Only manifold surfaces are considered, thus the surface is not
allowed to be self-intersecting (in terms of sharing
nodes by different parts of the grid). Such a representation is
general enough to describe complex realistic geometries. Note that
non-manifold domains can be represented by a set of manifold surfaces.

The boundary edges of the control grid (i.e. the edges shared just by a single
triangular facet of the grid) form the boundary
curves of the surface. The end nodes of each curve represent
vertices. Nodes not representing vertices are called curve nodes if
they form a curve, otherwise they are called surface nodes.
A surface node with valence 6 is called regular, otherwise it is
called irregular.

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**Up:** Triangulation of Discrete 3D Surfaces
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*Daniel Rypl *

2005-12-07