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The generation process of initial mesh. First generating a regular hexagon (the dashed lines in blue) in the plane tangent to p, and projecting the vertices of the hexagon onto implicit surfaces to estimate curvature. Then adjusting the edge length of the hexagon to ρ·r, and finally, projecting the vertices of hexagon onto surface again to generate an initial mesh, consisting of vertices p1,⋯,p6 and p.
