TIN lines intersecting the boundary have been trimmed at the boundary limits thereby not “destroying” the TIN lines. The red polyline rectangle represents an outer boundary that has yet to be added to the surface definition.Īfter adding the rectangle as an outer boundary with the non-destructive breakline option selected, we notice that the TIN lines outside the boundary are no longer displayed. In the image below, we see a surface displaying TIN lines. By default, the Non-destructive breakline checkbox is filled, but what does this mean? In the Add Boundaries dialog, we would choose the type of boundary we are adding. TIN lines are drawn along the polylines forcing a continuous contour line along those polylines. When contours or polylines representing contours are added to a surface, they will trigger a breakline behavior. TIN lines will be drawn along the contours to maintain control over the shape of the entities representing the contours. When a contour is approaching the breakline, it will seek out its elevation along that breakline before being drawn beyond it. The program will interpolate along the breakline for contour elevations. TIN lines are reconfigured to be drawn along the breakline from vertex to vertex. Adding breaklines to a surface causes a change to the triangulation. They also represent crowns and flowlines. These are examples of different boundary types.īreaklines represent linear features of a site such as edges of pavements, sidewalks, shoulders, curbs, or top of banks. Show boundaries display areas inside hide boundaries, as with the case of courtyards enclosed by a building. Hide boundaries prevent the display of information inside of its limits we would apply hide boundaries to a building outline to “hide” the contours inside the building outline. We can choose to omit the display of the surface outside a boundary by designating it an outer boundary. The purpose of this blog is to discuss those settings.īoundaries are added to omit displaying areas of the surface. In the case of Boundaries, Breaklines, and Contours, there are settings presented that are often ignored because they are not understood. Various types of data can be added to AutoCAD Civil 3D surfaces to ultimately create the contours that we seek to display.
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March 2023
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