AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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Valued Contributor
Topher5000
Posts: 93
Registered: ‎12-11-2008
Message 1 of 9 (473 Views)

Problems with datum

473 Views, 8 Replies
01-22-2013 10:46 AM

The assembly consists of an urban sidewalk & a BasicSideSlopeCutDitch on each side.  I've tried setting the overhang correction to bottom links & then top links, but some of the cross sections come out wrong, some of them really wrong.  I've attached screen caps of what's happening.

I did a search & came across something about the link being set to overlay not datum, but I couldn't find anything in the subassembly or assembly properties.

I've had this happen on other drawings, but it hasn't been bad enough to affect the quantities too much, but I really need to get this figured out.

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sboon
Posts: 2,173
Registered: ‎11-08-2005
Message 2 of 9 (460 Views)

Re: Problems with datum

01-22-2013 11:07 AM in reply to: Topher5000

The coding diagram in the help file shows the problem.  The two sides of the concrete sidewalk both have Datum codes, so the Datum surface has problems. Try replacing the UrbanSidewalk sub with GenericPavementStructure, so that you can control all of the point and link codes.  Also make sure that your corridor surface definition has the "Add as Breakline" option turned on.

 

Valued Contributor
Topher5000
Posts: 93
Registered: ‎12-11-2008
Message 3 of 9 (417 Views)

Re: Problems with datum

01-22-2013 01:19 PM in reply to: sboon

Thanks Steve.

Looking at the coding diagram in your link, L2 across the top is coded Top & Sidewalk & only L1, L4, L5 L6 & L3 are coded as datum.  Is it L4 & L6 that are causing the problem?

I tried creating another assembly using the GenericPavementStructure.  I've never done anything with codes, so I'm just wingin' it.  I picked the subassembly & using the Properties tool palette, called the BottomLink Code & the OutsideLink Code 'Datum'.  Is this how they're set?

After setting the corridor to use that assembly, the datum goes across the top, although the sections at the end are still screwey.  I'll have to take a look at the corridor, although there aren't any warnings when rebuilding it.

Thanks for your help.

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sboon
Posts: 2,173
Registered: ‎11-08-2005
Message 4 of 9 (393 Views)

Re: Problems with datum

01-22-2013 02:46 PM in reply to: Topher5000

Yes I'm almost certain that L4 and L6 are the source of your problems.  Users often run into the same problem with the curb subassemblies for the same reason.

 

I don't have the dimensions of your assembly but I've created my own version that you can look at.  Basically what I did was copy the point, link and shape codes from the UrbanSidewalk sub to the GenericLane.  I wanted to make sure that the Datum surface would follow the yellow polyline so I used DaylightGeneral on both sides and added an extra link 1mm wide right at the attachment point.  If I've done it correctly your Datum surface will have a near vertical face at the inside and outside of the sidewalk.

 

Clipboard01.png

 

 

Valued Contributor
Topher5000
Posts: 93
Registered: ‎12-11-2008
Message 5 of 9 (368 Views)

Re: Problems with datum

01-23-2013 06:24 AM in reply to: sboon

Thanks Steve!  I'll take a look at it & try to learn from what you've done.  I'll report back on how it goes.

Valued Contributor
Topher5000
Posts: 93
Registered: ‎12-11-2008
Message 6 of 9 (363 Views)

Re: Problems with datum

01-23-2013 06:37 AM in reply to: Topher5000

Rats, we're using C3D 2010.  FYI, the CSW's 1.8m wide by 0.13m deep.

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sboon
Posts: 2,173
Registered: ‎11-08-2005
Message 7 of 9 (350 Views)

Re: Problems with datum

01-23-2013 08:24 AM in reply to: Topher5000

I've attached screenshots showing the parameters I used for the GenericPavementStructure and DaylightGeneral.  You should be able to recreate the assembly from this.

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tcorey
Posts: 2,640
Registered: ‎12-18-2002
Message 8 of 9 (342 Views)

Re: Problems with datum

01-23-2013 08:37 AM in reply to: sboon

 Looks good, Steve. Thanks.

Tim Corey, Owner
Delta Engineering Systems
Redding, CA
Autodesk Authorized Value-Added Reseller
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sboon
Posts: 2,173
Registered: ‎11-08-2005
Message 9 of 9 (337 Views)

Re: Problems with datum

01-23-2013 08:45 AM in reply to: tcorey

Turning on the deflect outer face switch would create this, which is not what he asked for.

 

Clipboard01.png

 

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