From the course: Civil 3D: Basic Roadway Design

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Editing an alignment graphically

Editing an alignment graphically - AutoCAD Civil 3D Tutorial

From the course: Civil 3D: Basic Roadway Design

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Editing an alignment graphically

Design is an iterative process and typically progresses from a rough layout to something more refined. Luckily Civil 3D provides excellent tools for modifying alignments, especially the graphical tools that we're going to look at in this video. Let's get started. Alignments are smarter when you compare them to AutoCAD geometry. For example in this drawing I've got a Civil 3D alignment on the left and an AutoCAD poly line on the right. And although they look very similar as far as their geometric make up, they actually behave quite differently when you try to modify them. If I click this alignment and then move the grip controlling the beginning point, you can see how the curve responds, how it always wants to stay tangent. And that's definitely a good thing when you're designing roads because if the curves don't stay tangent you have some very difficult geometry to navigate for a vehicle. If I click on the poly line I don't see the same behavior. When I move the end point, I create a…

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