Another, less eloquent way of removing unwanted TIN lines is to delete them from the surface rather than using a boundary to do it for you. This method is best when you need to remove only a few TIN lines in isolated areas. There are two important things to remember when deleting TIN lines. The first is that in order for the lines to be deleted, they must be visible, which means that you must apply a style that displays them. The second thing to remember is that you cannot use the AutoCAD ERASE command to remove them; instead, you must use the Delete Line command created especially for surfaces.To delete unwanted TIN lines from a surface, follow these steps:
- Open the drawing named Delete TIN Lines.dwg or (Delete TIN Lines.dwg (METRIC))Delete TIN Lines.dwg located in the Exercise_04 class data folder.
- Click one of the contours in the top-right viewport, and then select Surface Properties on the ribbon.
- On the Information tab, change the Surface style to Triangles and click OK.
- In the left viewport, zoom in to the southern edge of the surface, and note the TIN lines that extend across the bend in the stream (shown previously in Adding Boundaries - Figure 1).
- Select one of the TIN lines, and then click Edit Surface ➢ Delete Line on the ribbon. Select the erroneous lines as indicated previously in Adding Boundaries - Figure 1. Press Enter after you’ve made your selection.
- Pan around the edge of the surface, and delete any other TIN lines that look like they don’t belong. The resulting surface should look similar to Figure below.
The extents of the surface after erroneous TIN lines have been removed. The areas of removal are highlighted.
- Adding Boundaries
- Deleting Lines
- Editing Points