AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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engrtech
Posts: 730
Registered: ‎05-05-2008
Message 1 of 14 (1,128 Views)
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How to an alignment and profile from a 3d spline?

1128 Views, 13 Replies
03-27-2012 12:53 PM

I'm wanting to make a corridor model from an imported DGN that contains centerlines and edges of pavement for a neighborhood.  From 2011 and 2012, the import creates splines while 2010 and older create 3d polylines.  

 

The alignment creation from objects does not work on a 3d polyline or spline and I have no clue how to make a profile from the same object.  How could I go about making an alignment and profile from a 3d spline or 3d polyline?  Seems like that should be something simple, yet I'm stumped.

 


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tcorey
Posts: 2,557
Registered: ‎12-18-2002
Message 2 of 14 (1,112 Views)

Re: How to an alignment and profile from a 3d spline?

03-27-2012 11:12 PM in reply to: engrtech

Here's a quick way to solve your issue, at least with 3D polylines. I have not tested with splines, but I think it will not work:

 

http://screencast.com/t/fatZxtxldO

 

Best regards,

 

Tim

 

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
Valued Mentor
engrtech
Posts: 730
Registered: ‎05-05-2008
Message 3 of 14 (1,111 Views)

Re: How to an alignment and profile from a 3d spline?

03-28-2012 05:07 AM in reply to: tcorey

I would love to watch that video but our idiotic IT masters block screencast so I have no way to view it.

 

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tcorey
Posts: 2,557
Registered: ‎12-18-2002
Message 4 of 14 (1,105 Views)

Re: How to an alignment and profile from a 3d spline?

03-28-2012 09:00 AM in reply to: engrtech

Sorry, that's the only place I saved it, so I can't email it to you. Maybe you can get the IT Nazis to give you special permission for three minutes and thirty-six seconds. I will give them my personal guarantee that it's not porn.

 

Tim

 

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
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907Trekker
Posts: 56
Registered: ‎10-28-2009
Message 5 of 14 (1,099 Views)

Re: How to an alignment and profile from a 3d spline?

03-28-2012 09:53 AM in reply to: engrtech

I can't get this to work for a spline, but for a 3d polyline an easy way to make an alignment and profile is to make a "Quick Profile" from the profile dropdown, make sure you select the "draw 3d entity profile" box.  Then under the file menu select Export -> Export to LandXML.  The press the uncheck everything button.  Then use the select button to just select your profile.  This will export an alignment and a profile to an xml file.   Just reimport it and you are good to go.

 

So in summary, quick profile, export it to land xml, reimport it.  I attached a few pics.

 

 

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tcorey
Posts: 2,557
Registered: ‎12-18-2002
Message 6 of 14 (1,091 Views)

Re: How to an alignment and profile from a 3d spline?

03-28-2012 10:06 AM in reply to: engrtech

Nice, straight-forward solution.

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
Valued Mentor
engrtech
Posts: 730
Registered: ‎05-05-2008
Message 7 of 14 (1,083 Views)

Re: How to an alignment and profile from a 3d spline?

03-28-2012 12:01 PM in reply to: engrtech

Thanks for the information!  I did end up getting to watch the video by using my boss' Galaxy Tab 10.1.  I am going to try the other method mentioned about the quick profile and LandXML method. 

 

Seems like there should be a much easier way to use a 3d spline/polyline to accomplish the same task.  In fact, I think having a 3d polyline or spline would be much better and easier to use as a baseline in a corridor than the two separate entities of alignments and profiles.  I know that's how road design has been done for eons, but internally it would be so much easier to program and just do a type of sweep/loft along a path similar to how 3ds Max could do a road.

 

Oh well, back to work.  Thanks again.

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Valued Contributor
907Trekker
Posts: 56
Registered: ‎10-28-2009
Message 8 of 14 (1,078 Views)

Re: How to an alignment and profile from a 3d spline?

03-28-2012 12:31 PM in reply to: engrtech

I agree, and it seems like C3d is so close to being able to do this.  You can make an alignment and profile from a corridor feature line so why not from a regular feature line?  You should be able to just convert your 3d polys (or maybe splines) to a feature line and press a button. 

 

I know it would make my life easier...

 

 

Valued Mentor
ralstogj
Posts: 607
Registered: ‎10-01-2006
Message 9 of 14 (1,035 Views)

Re: How to an alignment and profile from a 3d spline?

04-09-2012 06:52 PM in reply to: 907Trekker

Found this tip on using the flatten command to get a polyline with arc's from a spline no z  throu.

http://lynn.blogs.com/lynn_allens_blog/2011/07/an-autocad-hip-tip-on-turning-splines-into-plines.htm...

 

 

Regards

Justin Ralston
http://c3dxtreme.blogspot.com/
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Sinc
Posts: 6,207
Registered: ‎11-18-2006
Message 10 of 14 (1,028 Views)

Re: How to an alignment and profile from a 3d spline?

04-09-2012 09:45 PM in reply to: engrtech

engrtech wrote:

Seems like there should be a much easier way to use a 3d spline/polyline to accomplish the same task.  In fact, I think having a 3d polyline or spline would be much better and easier to use as a baseline in a corridor than the two separate entities of alignments and profiles.  I know that's how road design has been done for eons, but internally it would be so much easier to program and just do a type of sweep/loft along a path similar to how 3ds Max could do a road.



The problem with that is we typically Engineer things in the Civil world.  And for that, it is by far easier to use the 2-1/2D paradigm (e.g. horizontal layout + elevation) vs. a true 3D paradigm.  Artists and machinests find it easier to use the true 3D, but when it comes to a construction project, true 3D can greatly increase the complexity while not really helping.

 

Same thing with splines, even in 2D.  They're a lot more complex a geometric figure, and make land work much more difficult.  There's the raliway and highway curves, but those tend to be described in a rather simplified form that limits options, and makes it possible for computers (including calculators, data collectors, smart phones, etc.) to do those calcs with a minimum of input.  Using free-form 3D splines makes for a lot more complicated possibilities, creating difficulty for everyone who must then build your design.

Sinc
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