Graphics Programs Reference
In-Depth Information
Editing Points
As you have learned, the fundamental building blocks of surfaces are points and
lines. The points are derived from some other source of data, such as standard
breaklines, contours, survey points, and so on. If there is an error in one of those
source objects, there will be an error in the surface as well. When this occurs, you
can either edit the source data and rebuild the surface, or edit the surface itself.
Exercise 4.5: Edit Points
You have already learned about editing survey source data (survey points and
survey figures). In this exercise, you'll edit the surface.
If you haven't already done so, go to the topic's web page at
www.sybex.com/
go/civil3d2015essentials
and download the files for Chapter 4. Unzip the files
to the correct location on your hard drive according to the instructions in the
introduction. Then, follow these steps:
1.
Open the drawing named
Editing Points.dwg
located in your
Chapter 04
class data folder.
The two right viewports are zoomed in to the location where the
driveway meets the road on the north side of the property. In this
area, one of the surface points is incorrect. In the plan view on the
top right, the effects of the incorrect point can be seen in the densely
packed contours. In the 3D view on the bottom right, the erroneous
point appears as a downward spike in the surface.
2.
Click one of the contours to select the surface, and then click Surface
Properties on the ribbon.
3.
In the Surface Properties dialog box, click the Information tab and
change Surface Style to Triangles And Points. Click OK.
The display of the surface changes to lines and points, with the
points appearing as plus-sign markers.
4.
Click any TIN line to select the surface, and then click Edit Surface
➢
Modify Point on the ribbon.
5.
When prompted to select a point, click the point in the 3D view that
is located well below the other points (see Figure 4.14). Press Enter.
6.
At the command line, type
190.76 (58.144)
, and press Enter.
Notice how the surface is modified but the survey figure is left
behind. Depending on the situation, it may be prudent to go back to
the source data for the survey figure and correct that as well.
