Graphics Programs Reference
In-Depth Information
6. In the lower-right viewport, zoom in to the area of the buildings, and
notice that there are now voids where the buildings are located, as
shown in Figure 4.12.
Remember that con-
tours aren't the only
things surfaces are
used for. No matter
how you look at this
surface, you don't want
data to appear where
the buildings are.
FiGuRE 4.12 The effect of hide boundaries added at building locations
7. Save and close the drawing.
You can view the results of successfully completing this exercise by opening
Surface Boundaries - Complete.dwg .
Deleting lines
Another, less eloquent way of removing unwanted TIN lines is to delete them from
the surface rather than use 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 impor-
tant things to remember when deleting TIN lines. First, in order for the lines to
be deleted, they must be visible, which means you must apply a style that displays
them. Second, you can't use the AutoCAD ERASE command to remove them;
instead, you must use the Delete Line command created especially for surfaces.
Exercise 4.4: Delete lines
In this exercise, you'll delete unwanted TIN lines from 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
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