AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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Neilw
Posts: 2,318
Registered: ‎09-04-2006
Message 1 of 11 (435 Views)
Accepted Solution

How to edit alignment delta angle

435 Views, 10 Replies
11-17-2013 09:42 AM

I have created an alignment from an imported polyline. I now need to vary the delta angle between some of the tangents for different scenarios. I see the delta value in the panorama but it is not editable. Is there a way to enable it? If not, how can I adjust the angle parametrically??

Neil Wilson (a.k.a. neilw)
Infrastructure Suite/C3D 2013, LDT 2004, Power Civil v8i SS1
WIN 7 64 PRO
HP Pavillion h8xt, i7 2600, 12 GB
RADEON 6450, 1 GB
http://www.sec-landmgt.com

Perhaps a little late, but I think I've got a solution.

 

Except for the first tangent, all of the alignment elements here are floating.  All of the curves are from entity end, using radius and length (using the DeltaAng option on the command line) and all of the tangents are from curve end, length.

 

If you edit any of the delta or length paramters all of the downstream alignment will shift or rotate to maintain tangency.

 

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

*Expert Elite*
Pointdump
Posts: 963
Registered: ‎11-24-2009
Message 2 of 11 (392 Views)

Re: How to edit alignment delta angle

11-17-2013 04:17 PM in reply to: Neilw

Neil,

 

Could you trace a new alignment over your imported polyline to make a parametrically editable alignment?

 

Dave


Dave Stoll
Mohave Valley, Arizona

Intel Core i7-3820QM 3rd Generation Quad Core 2.7 GHZ CPU
16 GB DDR3 RAM ( 2 DIMM ) / 180 GB SSD
Nvidia GeForce 650M Graphics w/2 GB Memory
Windows 7 Professional 64 bit / AutoCAD Civil 3D 2014/2015
*Expert Elite*
Neilw
Posts: 2,318
Registered: ‎09-04-2006
Message 3 of 11 (370 Views)

Re: How to edit alignment delta angle

11-17-2013 07:18 PM in reply to: Pointdump
My constraints are: first tangent length to point of curve=130', next a curve of radius=45' for delta angle variable, 30, 45 & 60 degrees, then a final tangent so that total length of the alignment=250'. What components would I use to layout this alignment such that I can edit the deflections while controlling the other constraints?
Neil Wilson (a.k.a. neilw)
Infrastructure Suite/C3D 2013, LDT 2004, Power Civil v8i SS1
WIN 7 64 PRO
HP Pavillion h8xt, i7 2600, 12 GB
RADEON 6450, 1 GB
http://www.sec-landmgt.com
*Expert Elite*
Pointdump
Posts: 963
Registered: ‎11-24-2009
Message 4 of 11 (345 Views)

Re: How to edit alignment delta angle

11-18-2013 04:26 AM in reply to: Neilw

Neil,

 

Can you change the curve under the Tangency Constraint heading to make it Floating or Free?

 

Constraints.png

 

Dave


Dave Stoll
Mohave Valley, Arizona

Intel Core i7-3820QM 3rd Generation Quad Core 2.7 GHZ CPU
16 GB DDR3 RAM ( 2 DIMM ) / 180 GB SSD
Nvidia GeForce 650M Graphics w/2 GB Memory
Windows 7 Professional 64 bit / AutoCAD Civil 3D 2014/2015
*Expert Elite*
wfberry
Posts: 1,917
Registered: ‎09-05-2006
Message 5 of 11 (327 Views)

Re: How to edit alignment delta angle

11-18-2013 05:39 AM in reply to: Neilw

Neil:

 

Perhaps I am looking at this wrong but I only see 3 possibilites, 30. 45, 60 degrees.  The length of the curve plus the forward tangent will have to equal 120 feet.

 

Draw each with with a polyline and use the lengthen command to total 250', holding the back tangent to 130'.

 

Bill

 

You probably have something else in mind.

Mentor
mikehathaway2942
Posts: 270
Registered: ‎10-13-2009
Message 6 of 11 (303 Views)

Re: How to edit alignment delta angle

11-18-2013 01:08 PM in reply to: Neilw
I find the alignment layout tools very cumbersome. Just draw what you want with normal lines and curves and either 'add' your new data to an existing alignment or start a new alignment with your new lines and curves.
*Expert Elite*
Neilw
Posts: 2,318
Registered: ‎09-04-2006
Message 7 of 11 (298 Views)

Re: How to edit alignment delta angle

11-18-2013 01:20 PM in reply to: Pointdump

I can get the DELTA field to be editable by unlocking the constraints and changing the type but when I enter new values they won't stick. I also tried adding the curve to the end of a tangent (vs. curve between tangents). That approach allows me to change the delta but editing the delta only affects the curve, not the tangent. At this point I don't think it's worth investing more time into making this work so I'll just make do with redrawing manually.

 

If anyone comes up with a solution it might come in handy later.

Neil Wilson (a.k.a. neilw)
Infrastructure Suite/C3D 2013, LDT 2004, Power Civil v8i SS1
WIN 7 64 PRO
HP Pavillion h8xt, i7 2600, 12 GB
RADEON 6450, 1 GB
http://www.sec-landmgt.com
*Expert Elite*
sboon
Posts: 2,199
Registered: ‎11-08-2005
Message 8 of 11 (284 Views)

Re: How to edit alignment delta angle

11-18-2013 03:28 PM in reply to: Neilw

Perhaps a little late, but I think I've got a solution.

 

Except for the first tangent, all of the alignment elements here are floating.  All of the curves are from entity end, using radius and length (using the DeltaAng option on the command line) and all of the tangents are from curve end, length.

 

If you edit any of the delta or length paramters all of the downstream alignment will shift or rotate to maintain tangency.

 

Steve
Please use the Accept as Solution or Kudo buttons when appropriate

*Expert Elite*
Pointdump
Posts: 963
Registered: ‎11-24-2009
Message 9 of 11 (269 Views)

Re: How to edit alignment delta angle

11-18-2013 05:22 PM in reply to: Neilw

Neilw wrote:

I can get the DELTA field to be editable by unlocking the constraints and changing the type but when I enter new values they won't stick. I also tried adding the curve to the end of a tangent (vs. curve between tangents). That approach allows me to change the delta but editing the delta only affects the curve, not the tangent.


Neil,

 

I spent some time today trying to make your three possibles editable, and I came to the same conclusion.

 

Dave


Dave Stoll
Mohave Valley, Arizona

Intel Core i7-3820QM 3rd Generation Quad Core 2.7 GHZ CPU
16 GB DDR3 RAM ( 2 DIMM ) / 180 GB SSD
Nvidia GeForce 650M Graphics w/2 GB Memory
Windows 7 Professional 64 bit / AutoCAD Civil 3D 2014/2015
*Expert Elite*
Neilw
Posts: 2,318
Registered: ‎09-04-2006
Message 10 of 11 (256 Views)

Re: How to edit alignment delta angle

11-18-2013 09:03 PM in reply to: sboon

Your alignment works as desired Steve. Comparing our workflows I realized that I had used the fixed line from end of curve by mistake. After seeing yours working I revistited my work and found the error. Well done.

Neil Wilson (a.k.a. neilw)
Infrastructure Suite/C3D 2013, LDT 2004, Power Civil v8i SS1
WIN 7 64 PRO
HP Pavillion h8xt, i7 2600, 12 GB
RADEON 6450, 1 GB
http://www.sec-landmgt.com
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