Graphics Programs Reference
In-Depth Information
FiGuRE 5.1
A single-line drawing of the subdivision roads (in red)
Civil 3D alignments are designed specifically for the task of representing the ini-
tial single-line version of a linear design feature. They are also used to establish the
backbone of linear designs such as roads, railroads, channels, pipelines, and many
other examples. The lines, arcs, and spirals that make up an alignment have the
ability to interact with one another. This enables you to edit part of the alignment
and have the other parts fix themselves automatically. Also, more design objects
can be built around alignments, such as profiles, cross-sections, and corridors,
which will be discussed later in this topic.
Creating Alignments from objects
A common way of creating an alignment is to use the basic AutoCAD
®
software
geometry that's already in the drawing. You may be using someone's “sketch,” or
maybe you've chosen to draw the initial version of the layout this way because of
the simplicity of the AutoCAD tools. Whatever the case, Civil 3D makes it fairly
easy to convert simple AutoCAD entities into alignments.
Certification
Objective
Exercise 5.1: Create Alignments from objects
In this exercise, you'll create alignments from polylines in the drawing that rep-
resent road centerlines.
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 5. Unzip the files
to the correct location on your hard drive according to the instructions in the
introduction. Then, follow these steps:
Because alignment
design is strictly a 2D
type of design, the
drawings in this chap-
ter aren't set up with
multiple viewports.
▶
1.
Open the drawing named
Alignment from Objects.dwg
located in
the
Chapter 05
class data folder.
