Graphics Programs Reference
In-Depth Information
Order of
Operations
Arrow Buttons
If you haven't already
done so, download
and install the files for
Chapter 18 according to
the instructions in the
Introduction.
FiGuRE 18.2
You can change the order of operations using the arrow buttons. This can
affect the result of pasting multiple surfaces together.
Exercise 18.1: Combine Surfaces
◀
In this exercise, you'll create an FG Final surface by combining surfaces represent-
ing lot grading, road elevations, pond grading, and a small area of daylighting.
Make sure your back-
ground color is set to
white before complet-
ing the exercises in
this chapter.
1.
Open the drawing named
Combining Surfaces.dwg
located in the
Chapter 18
class data folder.
In this drawing, the lot grading design is complete, as shown by the
blue, red, and green feature lines. There is also a small area between
lots 73 and 76 where a grading group was used to calculate daylighting.
◀
2.
In Prospector, expand Surfaces, and note the surfaces that are listed.
Right-click Surfaces, and select Create Surface.
◀
All the surfaces except
EG have a style of _No
Display assigned to
them. That is why no
design contours are
shown in the drawing.
3.
On the Create Surface dialog, enter
FG Final
in the Name field, and select
Contours 1' and 5' (Design) (Contours 0.5m and 2.5m (Design)) as the
style. Click OK.
The new FG Final surface is listed in Prospector.
4.
In Prospector, expand Surfaces
➢
FG Final
➢
Definition. Right-click
Edits, and select Paste Surface.
◀
5.
On the Select Surface To Paste dialog, select Lots - Exterior, and
then click OK.
Contours representing
the grading for exterior
lots appear in the
left viewport. In the
bottom-right viewport,
you see a 3D model of
the interior grading.
6.
In the left viewport, zoom in to the interior lot area, and note the
haphazard contours extending across the road and through this area.
7.
Click one of the red or blue contours to select the surface, and then
click Edit Surface
➢
Paste Surface on the ribbon.
8.
Select Road FG, and click OK.
In the road areas, the contours you saw in step 5 are replaced
with contours that accurately represent the road elevations. In the
