Join Josh Modglin for an in-depth discussion in this video Creating a feature line from an object, part of AutoCAD Civil 3D Essential Training.
- [Instructor] In our previous exercise, we created a future line from scratch. But in this exercise, we're going to focus on being able to convert existing objects into a feature line and see if this is faster than some of the options, of course, as we do this. Now let's go to our exercise. It's 12-0-3-FL or feature line object. We have the existing polyline already drawn in, using standard AutoCAD methods. And so from the home ribbon, create design panel, under feature line on the middle left, we're going to choose to create feature line from objects.
When we do so, it presents a list of all the different objects we can convert into a feature line. We have lines, arcs, polylines, 3D polylines. And I love the option. We can even grab objects through an xref and then create a converted version of that object in this drawing as a feature line. We're just going to select this polyline here. Press enter to end the selection and again, we've already looked through this, so we of course have a feature line must belong on a site.
It can have a name. It can have a style. And then of course, a different layer to apply to it. Now our conversion options are available for us to see. We can erase the existing polyline or object, or we can leave the existing one. We're going to erase it as it simply was a model for us to use to create our feature line. Then we're going to assign elevations as well. Go ahead and choose okay. Because we checked assign elevations, it gives us information about how we can assign those elevations.
We can enter an absolute elevation. So the entire feature line would be one elevation once it's done. A good example where that might come in handy is if we're doing a finished floor feature line. Most of the time though, we're going to choose to get elevations from the surface. It'll list all the surfaces in the drawing. And we can choose to grab those elevations. Now there's two additional settings if we choose from surface. Whether or not we have the elevations relatively set from that surface.
In other words, do we want to create a feature line that is four feet below the surface elevations? We can choose to enter that by checking this box. We can also choose to insert intermediate grade break points. Now whether or not this box is checked really defines the accuracy of our feature line. Now you would think if it's going to be more accurate, we would want to check that box all the time. Well let's talk a little bit about what that box does.
That box simply looks at all of the TIN lines. So any of those triangle lines in the surface that we're getting the information from, if those cross the feature line, then we're going to pick up the elevation of that TIN line and apply it to our feature line. Another way to look at it is, if we chose to check that box, it is as if we went out to the site and we took a spray paint can and we marked the ground exactly as it is.
If there's ups, downs, leaves, even grass, any of this, any nuances or bumps in the ground, the existing terrain, that spray paint will place itself on that and we're going to pick up every single little bump. If we don't check that box, it is as if we simply set stakes at every one of the vertices. All the specific points on our polyline and we pulled strings from stake to stake. Now if we did that, if there's a valley, it won't pick that valley up.
It'll simply go from the last stake across to the other stake. So it skips over the valley. But we may use that depending on, of course, the reason we have a feature line to begin with. So this exercise, we're going to check the box and see the results. And go ahead and click okay. And you see the results in our feature line showing up here. The square grips are the existing polyline's vertices. And so those, of course, turn into what are called PIs, or Point of Intersections, for this feature line.
The circles are what are called elevation points or what we called grade breaks earlier on. And so it added a ton of elevation points on this feature line. Now this feature line goes up and down to more closely match the existing ground. So you see how many elevation points have been added to make that feature line as accurate as possible, depending of course on the accuracy of your surface.
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 11m 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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