Autodesk CIVIL3D Tutorial - Page 428

To work with crossing feature lines NOTE This exercise uses Grading-7.dwg with the modifications you made in the previous exercise, or you can open Grading-8.dwg from the tutorial drawings folder (page 819). 1 In the right viewport, select feature line ABC. Right-click. Click Elevation Editor. The Grading Elevation Editor displays a list of the points of intersection ( PIs, or horizontal geometry points) and elevation change points ( vertical geometry points) along the feature line. Notice that the icon is displayed in the first row. This icon indicates that the building pad feature line also has a PI at this point. When two feature lines cross at a common vertex, both vertices must share the same elevation value. The elevation for both feature lines at this point is determined by whichever feature line was most recently edited. In the following illustration, the common vertex is in Circle A. 2 In the Grading Elevation Editor click Flatten Grade Or Elevations. Unselect All Rows. Click 3 In the Flatten dialog box, select Constant Grade. Click OK. Notice that in the Grading Elevation Editor, the Grade Ahead and Grade Back values are updated to a consistent value. When you flatten a feature line, the points between the start elevation and the end elevation are set 416 | Chapter 11 Grading Tutorials