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Snapping the cutting point. (a) The lambda values of cutting point. Given a threshold value λ, we can easily obtain two cut-off points A, B, and determine the un-snapping area AB (green segment) and snapping areas v1A, v2B (orange segments) in (b). If p is located in the un-snapping area, then p remains unchanged; (c), (d) otherwise, snap p to the corresponding end point of edge.
