Discover how to create feature lines from objects in this comprehensive breakdown. Delve into the process of drafting boundaries, offsetting polylines, and assigning elevations to effectively create feature lines from objects.
Key Insights
- The process of creating feature lines from objects starts with drafting boundaries of parcels using polylines, which are then offset inward to create pads for different parcels.
- These created polylines are then transformed into feature lines, with Civil 3D allowing the assignment of specific elevations and the choice of various styles and preferences for each line created.
- The process also introduces the concept of 'Grade Breakpoints', which are additional points inserted on a feature line when crossing certain lines on the surface. This functionality can be used when creating additional feature lines in the future.
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So in this video, we're going to go ahead and create some more feature lines, but this time we're going to go ahead and use our create feature lines from objects option. So inside of creating feature lines, inside of this drop down menu, we have the options for create feature lines from objects, create feature lines from alignments, create feature lines from corridors, and create feature lines from stepped offset.
We're going to go ahead and skip over feature lines from alignments and feature lines from corridors, because these two are identical to create feature lines from objects, except for that we're using a specific object, so an alignment or a corridor. So in order to create feature lines from objects, we're going to need to have an object to create a feature line from. So I'm going to go ahead and create quite a few polylines in this drawing, and then we're going to use those polylines to create our feature lines.
So I'm going to go ahead and do PL for polyline. I'm going to start drafting in these boundaries of these parcels, and then we're going to do similar to what we did in the last video, and we're going to take these polylines, we're going to offset them in 15 feet to create the pad for our different parcels. So I'm going to go ahead and continue to go around these parcels.
So as I hit these curves, I'm going to go ahead and go to an arc. I'm going to click here. I'm going to switch back to a line by typing L. I'm going to go here.
I'm not going to switch to an arc here because it won't give me the correct arc. So I'm just going to do a line. I'm going to close out.
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I'm going to grab this polyline. I'm going to go ahead and hit control two times to get to an arc. I'm going to shift right click.
I'm going to choose perpendicular and go perpendicular to this property line so that my arc is on the property boundary. I'm going to go ahead and move on to the next parcel. So I'm going to click.
I'm going to click the end of my curve. I'm going to click a line. I'm going to go ahead and click over here.
Line, curve, curve, and line, and then close. Now I'm going to convert all of these lines that should be curves. I'm going to be doing control twice to get into the arc.
I'm going to go ahead and go perpendicular. It looks like I'm missing a curve in here or a line segment in here. So I'm going to go ahead and look at this.
And it does appear that there should be a snap point in here somewhere. So there it is. I'm going to snap there.
I'm going to go ahead and go to a curve by control twice. I'm going to go perpendicular to there. I'm going to go ahead and grab this into your grip.
Control twice to get to my arc. Perpendicular to this curve. I'm going to go ahead and control twice.
I'm going to go perpendicular to this curve. I'm going to go ahead and select this. Control twice.
Perpendicular to this curve here. And then I'm going to grab my last parcel, which I'm going to start in this front corner. I'm going to go to that corner.
I'm going to go to this line here. I'm going to go to this corner there. And I'm going to close it off.
I am going to control twice to get into curve. I'm going to go perpendicular to my parcel boundary. I'm going to go control twice to get to the arc.
And then I'm going to go perpendicular to my property boundary. Now I have these polylines. I'm going to go offset.
I'm going to go ahead and go 15. I'm going to choose this one. Inward.
This one. Inward. This one.
Inward. This one. Inward.
This one. Inward. I'm going to escape out.
I'm going to go ahead and select these outer polylines. I'm going to erase them out. And then now that I have these polylines here, I'm going to go ahead and go up to feature line.
I'm going to go ahead and select from objects. Now Civil 3D is asking me to select lines, arcs, polylines, or 3D polylines to convert to feature lines. So I'm going to go ahead and start with this feature line, or this polyline here.
I could continue to click through, but I'm going to do the first one and hit ENTER. Civil 3D is asking me which site I would like to place onto, what I would like the name to be. So I'm going to go ahead and choose this for a name of Lot 9, because I believe that is Lot 9. So I'm going to choose Lot 9. I'm going to choose a style.
I'm going to go ahead and go with Grading Design. I'm going to leave it as Setobofeet. I'm going to choose to erase existing entities.
So the polyline will go away when I create this new feature line. I am going to assign elevations. I am not going to weed any points, because I know it's only going to be four points.
So I'm going to go ahead and click OK. Civil 3D is going to ask me to assign an elevation or choose from a surface I'm going to go ahead and assign an elevation. And if you choose to assign from a surface, you do have an option for Insert Intermediate Grade Breakpoints.
And that would be where you're crossing 10 lines on your surface. It would insert additional grade breakpoints onto your feature line. And we'll talk about that when we create additional feature lines.
But for now, I'm going to assign an elevation. I know that this contour was 190, and I know that these are 2 and 10. So I know that this is 88, 86, 84.
So I want to be at 86. So I'm going to go ahead and go with an elevation of 186. I'm going to go ahead and click OK.
And Civil 3D has now created a feature line for me. If I go and I select the feature line and go to the Contextual Ribbon bar and shoot for the Elevation Editor, I'm going to see that all of my elevations for that feature line are at 186. So from here, I'm going to go ahead and do the same thing for the next four parcels.
I'm going to go ahead and select Feature Line. I'm going to confirm this was Lot 9. This actually is Lot 1. So I'm going to go ahead and select this feature line. I'm going to go to Properties.
I'm going to change the name to Lot 1 and hit ENTER. I'm going to close this out. Now I have 9876.
Now I can go in numerical order. So I'm going to go ahead and go Feature Line, Object, select the polyline, hit ENTER, leave it as Dev Branch, change the name to Lot 9. I'm going to go ahead and leave it as Gradient Design, Topo Feet, Assign Elevations and Erase Existing Entities, OK. I'm going to go ahead and change it from 642.
So I'm going to go to 182 and hit OK. Now I'm going to move on to the next one, Feature Line, Objects, select this polyline. We're on Lot 8. We're on an elevation.
This should be, since it's 2 and 10, I'm assuming this will be 180. So I'm going to go ahead and hit ENTER. I'm going to choose Dev Branch.
I'm going to choose Lot 8. I'm going to leave it as Gradient Design, Topo Feet, Erase and Assign Elevations, OK. I'm going to go ahead and change this to 180. I'm going to go ahead and click OK.
I'm going to go ahead and do Feature Line, Objects, selecting this polyline, hitting Enter. I'm going to go ahead and leave it as Dev Branch. I'm going to go to Lot 7. I'm going to leave it as Gradient Design, Topo Feet, Erase and Assign.
I'm going to go ahead and click OK. I am going to assign an elevation of this elevation right here, which is 182. I'm going to click OK.
And then I'm going to move on to my last polyline. I'm going to create Feature Line from Objects. I'm going to select this polyline.
I'm going to go ahead and hit ENTER. I'm going to go ahead and make sure I'm Dev Branch. I'm going to change it to Lot 6. I'm going to have Gradient Design as my style, Topo Feet as my layer, Erase Existing Entities and Assign Elevations.
Click OK. I'm going to assign an elevation of this contour right here, which is 182. So I'm going to leave it as 182.
I'm going to go ahead and click OK. Now I have all of these Feature Lines created, so I can go ahead and select any of them, check the Elevation Editor of it, make sure that the elevations are correct. I'm going to go ahead and close.
I'm going to go ahead and save this drawing, and then I'll meet you in the next video.
