Join Josh Modglin for an in-depth discussion in this video Feature lines and sites, part of AutoCAD Civil 3D Essential Training.
- [Lecturer] As we begin to learn about Feature Lines here in chapter 12, we have to think of Feature Lines as very smart 3D polylines. Really, they're 3D polylines on steroids. For example, with 3D polylines, you cannot have curvature whereas with Feature Lines, you can. With 3D polylines, every single vertex is containing an x, a y and a z. And therefore, you could change the segments and plan view as well as of course, the elevations.
Whereas with Feature Lines, you have, what are called Grade Brakes. Grade Breaks allow us to add elevation points along a plan view segment without having any x, y control, that segment stays the same in plan view and we can add additional elevations along that segment. Another key factor that really makes Feature Line stand out from 3D polylines or any other 3D design that we may be doing are that Feature Lines belong in sites.
Now you can, again, have Feature Lines that are siteless, that don't belong to any sites at all but there's a reason they're designed to belong in sites. I'll give you an example, we have two Feature Lines here. These Feature Lines, as you see, only have a start point and an end point and of course, elevation at each one of these locations. But if we looked at these two Feature Lines in 3D, you'll notice that these Feature Lines, even though there's only two points to them, this blue Feature Line is pulled down and a third point or z is given at where the red Feature Line crosses.
The reason being, if two Feature Lines belong in the same site, we're seeing that site again, the container, they must belong at the same z where they cross. So far, we've seen sites being a container of horizontal objects that interact with one another and create parcels. Now we're seeing sites being a container of verticore 3D design that interact with one another in such a way that they must belong on the same z where they cross.
This is a very powerful feature when we use it effectively. If we don't understand it or don't know about it, this can cause our drawing to become a mess or worse, crash. And so understanding the interaction, if they're in the same site, they must belong at the same z elevation where they cross. So one Feature Line would be pulled down or Feature Line will be pulled up depending on the style. As styles for the Feature Line, really are what drive the priorities of which one is the controlling Feature Line.
Another factor, of course, is if the Feature Line that is crossing as a point, a point of intersection, what we would call a vertex there, then it would also be the controlling factor. And so if you notice here, our two Feature Lines belong to two different styles, you can tell by the coloration. Well, which style takes priority of the other? We go to our Tools space and under prospector, you see our Sites, of course, you see the different Feature Lines and if you right click on Feature Lines in our Site, under the properties for our Feature Lines, you have a few different items there.
The last tab called Options gives a list of all the Feature Lines styles in the drawing with arrows, allowing us to control one over the other. So the higher the Feature Line style, the more control it has. And so in this case, what we're going to do is we're going to move the Color 160 above red, click Okay. And now, let's see how these two Feature Lines look in 3D.
Now, you see that the red Feature Line is pulled up to the blue. And so the styles are one of the driving factors for priorities of which one is pulled. But the key for this entire exercise, understand that Feature Lines that belong in the same site, if they cross or even touch each other, they must have the same z at that location.
This course gets you up and running with AutoCAD Civil 3D. First, instructor Josh Modglin shows how to model a surface, lay out parcels, and design geometry, including the making of horizontal alignments and vertical profiles. Next, Josh demonstrates how to create corridors, cross sections, pipe networks, and pressure networks. Then, he covers working with feature lines and grading objects, and how to share your data. He wraps up by providing an overview of plan production tools.
- Navigating the Civil 3D interface
- Using point groups and description keys
- Importing survey data
- Managing figures
- Creating and analyzing surfaces
- Creating parcels
- Working with alignments
- Working with profiles and profile views
- Working with assemblies and subassemblies
- Creating Basic and Advanced Corridors
- Using an Intersection Object
- Making sample lines, cross sections, and section views
- Creating a pipe network
- Understanding pressure parts
- Creating and editing feature lines
- Creating and editing grading objects
- Sharing and referencing data
Skill Level Beginner
Some of the exercise files do not properly function.
This course was built to work with the latest release of AutoCAD Civil 3D. If you are not running AutoCAD Civil 3D 2018 there are some exercise files that will not work for you.
AutoCAD Civil 3D: Designing Residential Projectswith Eric Chappell3h 12m Intermediate
AutoCAD Civil 3D: Designing Gravity Pipe Systemswith Eric Chappell3h 33m Intermediate
1. What Is Civil 3D?
What is Civil 3D?4m 43s
2. Civil 3D Interface
3. Establishing Existing Conditions
4. Modeling a Surface
5. Layout of Parcels
6. Design Horizontal Geometry: Alignments
7. Designing Vertical Geometry: Profiles
8. Civil 3D Corridors
10. Gravity Pipe Networks
11. Pressure Part Networks
12. Feature Lines
13. Grading Objects
14. Share Your Data
15. Plan Production Tools
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