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5.1.4
Creating Breaklines by Point Number
Civil 3D does not use special commands for drawing and defining breaklines the way that Land Desktop and
many other programs do. Instead, you draw the breaklines with standard AutoCAD commands, like the 3D
Polyline command, and then define these objects as breaklines after they have been drawn.
1. Create a new Layer named Breaklines-Survey and set it Current.
2. Thaw the layers PNTS-AEC, PNTS-BREAK, and
PNTS-DRIVEWAY.
3. Freeze the layers C-ANNO, C-PROP, C-PROP-LINE,
C-PROP-TABL, EX-WETLAND-LINE, and PNTS-WTLND.
The drawing will now display the surface as contours and points that you will use for breaklines. You may
need to Regen to clean up the display.
4. Enter 3P at the command line to start the 3D Polyline command.
5. Enter 'PN to change the prompt to Point Number.
Alternatively, you can also select the Point Number button
6. At the command line enter: 1408-1447 and [Enter] to draw the line.
7. [Esc] to end the Point Number prompt.
8. [Enter] to end the line.
9. Enter 3P at the command line to start the 3D Polyline command.
10. Use the points in the following list of points to draw the breaklines the same way that you drew
the previous line. Be sure to use the Point Number transparent command to change the prompt
to Point Number and to end the command completely after drawing each line. Also be sure to
[Enter] after each non-sequential point number as shown below in the list.
Point Numbers
1448-1486
1008-1021
1191-1209
1226-1257
1258-1278
1281-1324
1295 [Enter] 1661-1710
1622-1660 [Enter] 1294
1286 [Enter] 1348-1398 [Enter] 1287
1022-1074
1075-1105
1155-1158
1159-1160
1153-1154
1143-1151
1130-1142
1121-1129
Lesson: Building Surfaces from Survey Data
Chapter: Building a Survey Quality Surface
from the Transparent Commands toolbar.
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