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. Author manuscript; available in PMC: 2009 Sep 9.
Published in final edited form as: Comput Methods Appl Mech Eng. 2006 Feb 1;195(9):942–960. doi: 10.1016/j.cma.2005.02.016

Fig. 2.

Fig. 2

The quadratic error function (QEF) and the minimizer point in 2D. The red curve is an isocontour, and the green point is the minimizer point calculated in Equation 1. (p1, n1) and (p2, n2) represent the position and unit normal vectors of the two intersection points.