Exercise 1: Swapping TIN Edges

For more information, see the AutoCAD Civil 3D Help topic Swapping Edges.

Swap TIN edges

1. Open Surface-4A.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 lower edge of the surface.
   Click to view the area to zoom to.

   
3. In Toolspace, on the Prospector tab, expand the surface Definition collection. Right-click Edits.
4. Click Swap Edge.

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

5. Click a TIN edge to swap it.
   Click to view the recommended edges to swap.

   

   The edge is swapped if the following criteria are met:

   • Two visible triangles are separated by the edge.
   • The quadrilateral formed by the two triangles (which are separated by the edge) is convex.
6. Optionally, continue to click other TIN edges to swap them.
7. Press Enter to end the command.

   The edits are added as Swap Edge operations to the Edits list view on the Prospector tab.

   Note

   The Description column in the list view provides the coordinates of the pick point along the edge that was swapped.

To continue this tutorial, go to Exercise 2: Deleting TIN Lines.