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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. 2.

Fig. 2

A minimizer point (the red one) is calculated within an octree cell as the intersection point of two tangent lines. The two green points are intersection points of the red curve with cell edges. pi and ni are the position and unit normal vector at a green point, respectively.