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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: Comput Methods Appl Mech Eng. 2010 Jan 1;199(5-8):405–415. doi: 10.1016/j.cma.2009.06.007

Fig. 10.

Fig. 10

A special case for edge-contraction. In (a), a point P is embedded in a triangle P0P1P2. P and each edge of the triangle P0P1P2 construct a triangle. In (b), a point P is embedded in a tetrahedron P0P1P2P3. P and each face of the tetrahedron P0P1P2P3 construct a tetrahedron. When we contract any edge of triangle P0P1P2 or tetrahedron P0P1P2P3, duplicated and useless elements are generated.