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(a) A Voronoi diagram displaying partitioning of the geometry into polygons with area of surrounding structure encoded. (b) Computed centrelines are illustrated in red. The localisation of the opening points is achieved by analysing the change in the area of the surrounding structure. (c) The colourful disks represent different clipping techniques. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
