From the course: Autodesk Civil 3D 2019 Essential Training
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Feature lines and sites - AutoCAD Civil 3D Tutorial
From the course: Autodesk Civil 3D 2019 Essential Training
Feature lines and sites
- [Instructor] 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 three 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 brakes allow us to add elevation points along a plan view segment without having any xy 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 lines 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…
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