This tab manages the points that define the holes in the surface. A hole is defined by picking it in the main window, inside a closed line in the breakline tab. If no line exists, it will use the outline as the hole's borders, and no triangles will be created. The contours will also stop at the holes. For this reason, it is useful to first build a closed area using lines to delimit the hole before picking.
The options in the window and the pop-up menu are a less complete selection of the options found in the points tab.
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