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Civil 3D for Beginners
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Breaklines are critical to creating an accurate surface model because it is the interpolation of the data, not only the data itself, that determines the shape of the model.
Use breaklines to define features, such as retaining walls, curbs, tops of ridges, and streams. Breaklines force surface triangulation along the breakline preventing triangulation across the breakline.
Ref:AKN
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