Linear data used to force the surface triangulation along specific lines (like a ridge or a pavement edge). To add them, right-click Breaklines under the Definition tree and select your 3D polylines.
AutoCAD Civil 3D tutorials generally range from high-level beginner overviews to deep-dive technical sessions on infrastructure design. Reviews of these tutorials often highlight their effectiveness in teaching complex civil engineering tasks like surface modeling, corridor design, and earthwork calculations. Popular Tutorial Categories Beginner Fundamentals autocad civil 3d tutorial