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CAD Clinic: Getting Started with Civil 3D AlignmentsMay ix, 2006
By: Mike Choquette

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Civil 3D roads, railways, runways, bicycle paths and other linear designs all begin with an alignment object.

Alignments are used in nearly every ceremonious technology projection to help layout roads, railways, runways, walking and bike trails -- in fact, any kind of linear design characteristic. In these types of applications, alignments stand for centerlines, lane boundaries, shoulders, right-of ways and similar features. In addition, many other projects can do good from alignments such equally swales, waterways, utilities and some types of earthwork such equally levee, dam and landfill designs.
Autodesk Ceremonious 3D alignment objects tin can include line segments, circular arcs and spirals. Vertical data along an alignment is stored in a contour, as discussed in a previous CAD Clinic column. In Civil 3D, alignments are combined with profiles and assemblies (proposed cross sections) to create 3D design models called corridors. Alignments in Ceremonious 3D are dynamic objects linked to the profiles and corridors that depend on them, which means that changing an alignment through a tabular array of design data or through on-screen grip editing automatically redefines the alignment and updates profiles and corridors accordingly. This ability is a dramatic and long-awaited footstep beyond the functionality provided past Land Desktop.

Object Styles
Ceremonious 3D uses object styles to control the display and notation of objects such as points, alignments, profiles and and then on. Alignment geometry and labels automatically appear as you create alignments in existent fourth dimension based on selected alignment styles and alignment label styles. By and large speaking, almost firms customize these styles to match their company standards or customer deliverables.

If y'all're just getting started with Civil 3D, begin your drawings with the _AUTODESK CIVIL 3D IMPERIAL BY LAYER.DWT template (Autodesk Civil 3D (Regal) NCS Classic.dwt in Ceremonious 3D 2007), which contains a large number of sample styles. These sample styles tin can serve as examples of what Civil 3D is capable of, and could be useful as the outset bespeak of your own Civil 3D Standards. If you have an existing company template, showtime a new drawing with the same template and import your template contents using the AutoCAD Insert command. This process starting time requires you lot to make a copy of your template with the .dwt file extension changed to .dwg.

Importing Alignments
You can import alignments from other applications or build them straight inside Civil 3D. Point Groups, Surfaces, Alignments , Profiles, Parcels, Pipe Systems and some Corridor elements can be imported and exported easily with the LandXML format. In Civil 3D 2007, the import/export commands are available nether the File menu, only in earlier releases they were under the General pull-downward carte. Users also can import data directly from Country Desktop project files from commands in these aforementioned menus.

Keep in mind that changes fabricated to data imported from Country Desktop projects are non automatically applied to the original Land Desktop projection. However, if you want to update a State Desktop project database to include piece of work created in Ceremonious 3D, yous can do so by opening a Civil 3D 2006 drawing in Land Desktop 2006 and choosing the Projects/Extract Ceremonious 3D Data control.

Creating Alignments
You can create new alignments direct inside Civil 3D from polylines or create them interactively with the Alignment Layout tools. If the geometry for your alignment already exists in your cartoon, such as for an existing highway baseline that may be provided by a surveyor as lines and arcs, first join that geometry into a single polyline. Yous can create an alignment from your joined polyline with Alignments/Create Alignment from Polyline. This approach may be all-time when y'all need to perform some AutoCAD acrobatics to determine the first draft of your alignment, such as a subdivision road constrained by multiple property line offsets.

When creating an alignment from a polyline, several options are bachelor in the Create Alignment dialog (effigy 1). Alignments, profiles, cross sections, grading groups and parcels are stored in sites to permit designers to organize them accordingly. A site could represent a design alternative, a phase of a project, a separate geographic location or whatever other logical breakdown. You lot can choose an existing site from the drib-down listing or create a new site on the fly with the button to the right of the drib-downwardly listing (figure 2).

The Name and Clarification fields allow you lot to identify the alignment equally y'all run into fit. The Starting Station field is where you lot identify the station at the offset point of the polyline. Note that this station is easy to modify afterwards if y'all would rather define the starting station somewhere else. The Alignment Manner field lets you choose the fashion that controls the display of the alignment geometry itself -- specifically the alignment tangents, curves, spirals, extension lines, points of intersection, pass-through points, station reference betoken and direction arrows. You can choose to adjust or disable the display of all these elements through the Alignment Style. The Alignment label set option controls the alignment labels such as station text, station point labels and related note. The default layer the alignment is placed on is the layer specified in the Edit Drawing Settings Command. To alter this setting, right-click on drawing proper noun in the Settings tab of the Civil 3D Toolspace and choose Edit Drawing Settings. The conversion options let you add curves automatically to bending points in the alignment (points of intersection without curves) and automatically delete the original polyline, if you wish.

The alignment direction initially matches the direction of the original polyline. If you lot would prefer the alignment to run in contrary of the original polyline, use the Alignments/Reverse Polyline command.

Coming Soon
In a coming commodity, I'll discuss another way to create new alignments using Create by Layout and also hash out the alignment editing tools.

Ceremonious 3D alignment objects offering users a dynamic, easily updatable foundation for route design and similar linear design tasks. This long awaited toolset is an enormous footstep forward over the functionality of Land Desktop and similar software packages.

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