AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

Posts: 3
Registered: ‎05-03-2012
Message 1 of 4 (297 Views)

Widenig Curves

297 Views, 3 Replies
05-04-2012 08:49 AM

Hi All,


Im using Civil 3d 2012 and I couldnt find the function that I could offset the smooth curve aligment as shown on the attached pdf. I've looked thru the offset alignments but those linear, curve-cuve-reverse curve, curve-line curve doesn't help much. I would appreciate it if anyone might know the solution.



*Expert Elite*
Posts: 1,859
Registered: ‎09-05-2006
Message 2 of 4 (264 Views)

Re: Widenig Curves

05-05-2012 05:16 AM in reply to: wilwil02

You will probably need a spiral.  It appears you probably have a "varying" radius.



*Expert Elite*
Posts: 2,815
Registered: ‎04-27-2005
Message 3 of 4 (253 Views)

Re: Widenig Curves

05-05-2012 07:46 PM in reply to: wilwil02

When applying a widening through a curve it does not create a smooth transition. It segments it along the curve (I believe in 3 segments).


After a bit of testing, I've confirmed this:


The green line is the alignment and the white line is the offset alignment that transitions it's width from start to end of curve.

Brian Hailey
My Blog
Distinguished Contributor
Posts: 131
Registered: ‎09-14-2006
Message 4 of 4 (172 Views)

Re: Widenig Curves

10-26-2012 08:25 AM in reply to: BrianHailey

Has anyone figured out a way to dynamically increase the smoothness of the transition? Or an I stuck doing the transition manually to get it to look right? Seems like there should be a setting somewhere for this.

Civil 3D 2012
Windows 7 Pro (64bit)
Intel Xeon W5580 @3.20GHz
12gig RAM
NVIDIA Quadro 600
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