Graphics Programs Reference
In-Depth Information
Projecting linear objects
When you project an object to a profile view, different things can happen depend-
ing on the type of object you have chosen. For linear objects such as 3D polylines,
feature lines, and survey figures, the projected version of the object is still linear,
but it will appear distorted unless it's parallel to the alignment. This can be a bit
tough to envision, but just imagine a light being shone from behind the object in
the direction of the alignment. The projection of this object seen in a profile view
would be somewhat like the shadow cast by the object. The parts of it that are par-
allel to the alignment would appear full length, and the parts that aren't parallel
would appear shortened.
Based on the settings you choose, the elevations that are applied to a projected
linear object can vary. For linear objects that are already drawn in 3D, you can
choose to use the object elevations as they are. For 2D objects that need to have
elevations provided, the elevations can be derived from a surface or profile.
Projecting Blocks and Points
Objects that indicate location—such as AutoCAD points, Civil 3D points, and
blocks—are handled a bit differently than linear objects. They are represented
with markers or as a projected version of the way they are drawn in plan view. This
can lead to a distorted view of such objects because of the common practice of
applying a vertical exaggeration to the profile view. The options for assigning ele-
vations to these types of projections are the same as the options for linear objects,
with one addition: the ability to provide an elevation manually. This allows you to
specify the elevation graphically or numerically; independent of a surface, a pro-
file, or the actual elevation of the object you've selected.
Exercise 8.7: Project objects to Profile view
If you haven't already
done so, download
and install the files for
Chapter 8 according to
the instructions in the
Introduction.
In this exercise, you'll use object projection to show a water line on the Jordan
Court profile view.
1. Open the drawing named Object Projection.dwg located in the
Chapter 08 class data folder.
2. Click one of the grid lines of the Jordan Court profile view, and then
click Project Objects To Profile View on the ribbon.
3. Zoom in to the eastern property line, and click the blue 3D polyline
representing the water pipe that runs parallel to the eastern property
line. Press Enter.
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