Exercise 2: Simplifying A Surface - Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual

Exercise 2: Simplifying a Surface

In this exercise, you will reduce the number of points that are used to define
a surface.
A surface can be simplified by removing either TIN edges or points. When the
simplify surface command is complete, new points and TIN edges are calculated
based on specified parameters. The original surface points are still contained
in the referenced point file, but are not used in the surface triangulation.
In this exercise, you will use the Point Removal method of simplifying a
surface. This method randomly selects points from the surface, and removes
them based on the point density at different areas of the surface. More points
are removed from areas in which the concentration of points is very dense
than from areas that contain fewer points.
NOTE You cannot specify which points to remove. Points that are used to define
surface borders and breaklines are not removed with the Simplify Surface command.
For more information, see the AutoCAD Civil 3D Help topic Simplifying Surfaces.
This exercise continues from
74).
Simplify a surface
NOTE This exercise uses Surface-2.dwg with the modifications you made in the
previous exercise.
1 Click Home tab
C-TOPO-CONT-MAJR-ORIG and C-TOPO-CONT-MINR-ORIG layers, click
.
These layers contains polylines that represent the original major and
minor contours. These polylines will enable you to observe the results of
the Simplify Surface command.
2 Click Modify tab
3 Click Surface tab
Surface
4 In the Simplify Surface wizard, on the Simplify Methods page, select the
Point Removal option.
5 Click Next.
Exercise 1: Limiting Imported Surface Data
Layers panel Layer drop-down. Next to the
Ground Data panel
Modify panel
.
Exercise 2: Simplifying a Surface | 79
Surface.
Edit Surface drop-down
(page
Simplify