Exercise 2: Deleting TIN Lines

The TIN lines fall within a pond. By removing these lines, you can prevent contours from being drawn through the pond area.

For more information, see the AutoCAD Civil 3D Help topic Deleting TIN or Grid Lines.

This exercise continues from Exercise1: Swapping TIN Edges.

Delete TIN lines

1. Open Surface-4B.dwg, which is located in the tutorials drawings folder .

   In this drawing, the surface is displayed as TIN lines overlaid on an externally referenced landbase image.

2. Zoom in to the rounded pond area in the upper left of the surface.
   Click to view the lines that cross the pond area.

   
3. In Toolspace, on the Prospector tab, expand the surface Definition collection, and right-click the Edits item.
4. Click Delete Line.

   On the command line, you are prompted to select an edge (line) to remove.

5. Click an edge that crosses the surface of the pond. Press Enter.

   The edge is removed and an interior border is created, following the adjacent TIN lines.

6. Repeat the Delete Line command and remove all TIN lines that cross the pond surface.
   Tip

   Enter C on the command line to use crossing selection during the delete line command.

   Click to view the revised triangulation and see how the interior border should appear.

   

   The edits are added as Delete Line operations to the Edits list view in Prospector.

   Note

   The Description column in the list view provides the coordinates of the vertices for the edge that was deleted.

To continue this tutorial, go to Exercise 3: Adding a Hide Boundary.