AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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Active Contributor
MapleWalnutIceCream
Posts: 37
Registered: ‎01-27-2009
Message 1 of 10 (345 Views)

Grading not working around corners

345 Views, 9 Replies
02-26-2009 06:12 AM
I have a parking lot and I am using gradings to make the surface. I noticed that around some of the corners it doesn't follow the feature line curve. Any ideas? I have included a picture. The curve on the left works and the one on the right not.
*wfb
Message 2 of 10 (345 Views)

Re: Grading not working around corners

02-26-2009 07:19 AM in reply to: MapleWalnutIceCream

It does not follow curves.  It attaches to
nodes.  Select your curves and notice that there is a node where you have
existing triangles. Just add extra nodes with the included
tools.

 

Bill

 

 


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
I
have a parking lot and I am using gradings to make the surface. I noticed that
around some of the corners it doesn't follow the feature line curve. Any
ideas? I have included a picture. The curve on the left works and the one on
the right not.
Active Contributor
MapleWalnutIceCream
Posts: 37
Registered: ‎01-27-2009
Message 3 of 10 (345 Views)

Re: Grading not working around corners

02-26-2009 07:29 AM in reply to: MapleWalnutIceCream
Thanks. I found that exploding the feature lines into 3dpolys and then remaking them into feature lines also works ok, but not as smooth.
Active Contributor
MapleWalnutIceCream
Posts: 37
Registered: ‎01-27-2009
Message 4 of 10 (345 Views)

Re: Grading not working around corners

02-26-2009 07:30 AM in reply to: MapleWalnutIceCream
Thanks. I found that exploding the feature lines into 3dpolys and then remaking them into feature lines also works ok, but not as smooth.
*wfb
Message 5 of 10 (345 Views)

Re: Grading not working around corners

02-26-2009 08:50 AM in reply to: MapleWalnutIceCream

Feature lines can be curves but polys cannot. 
Use the correct tools for the job and add nodes with the FL tools.

 

Bill

 


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
Thanks.
I found that exploding the feature lines into 3dpolys and then remaking them
into feature lines also works ok, but not as smooth.
Employee
Matt.Anderson
Posts: 2,909
Registered: ‎05-13-2005
Message 6 of 10 (345 Views)

Re: Grading not working around corners

02-26-2009 10:09 AM in reply to: MapleWalnutIceCream
How are you adding the information to the surface? Check your mid-ordinate distance...and make it SMALL.
Matthew Anderson, PE
Product Manager
Active Contributor
MapleWalnutIceCream
Posts: 37
Registered: ‎01-27-2009
Message 7 of 10 (345 Views)

Re: Grading not working around corners

02-26-2009 10:41 AM in reply to: MapleWalnutIceCream
I didn't add the feature lines to the surface as breaklines. Your right to make that small.
I made gradings and set them to automatically produce a surface from them. I set their tesselation distance to 1. It seems to work sometimes. Some of my feature lines where broken at the PC which may have led to this problem. Joining them didn't seem to fix all of them.

I shouldn't need to add nodes to the curve of a feature line Bill. That is what the tesselation setting is for. But it probably is a good work around.
*wfb
Message 8 of 10 (345 Views)

Re: Grading not working around corners

02-26-2009 11:03 AM in reply to: MapleWalnutIceCream

One last question.  Have you tried to use
Feature Lines and their tools and use them as breaklines?  Doing items like
in your supplied .png would be a snap without using grading.

 

BTW, I'll take a double dip cone.

 

Bill


style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
I
didn't add the feature lines to the surface as breaklines. Your right to make
that small. I made gradings and set them to automatically produce a surface
from them. I set their tesselation distance to 1. It seems to work sometimes.
Some of my feature lines where broken at the PC which may have led to this
problem. Joining them didn't seem to fix all of them. I shouldn't need to add
nodes to the curve of a feature line Bill. That is what the tesselation
setting is for. But it probably is a good work
around.
Distinguished Contributor
C3D_RickGraham
Posts: 975
Registered: ‎09-06-2006
Message 9 of 10 (345 Views)

Re: Grading not working around corners

02-26-2009 12:20 PM in reply to: MapleWalnutIceCream
Yeah, we make our mid-ordinate 0.01. It follows obediently around curves (for the most part).



Rick
Thanks,
Rick
coauthor Mastering Civil 3D 2012
I blog at http://simplycivil3d.wordpress.com
Employee
Matt.Anderson
Posts: 2,909
Registered: ‎05-13-2005
Message 10 of 10 (345 Views)

Re: Grading not working around corners

02-27-2009 06:45 AM in reply to: MapleWalnutIceCream
Joining shouldn't make a difference difference only in that the grading object should only calculate once at that location, instead of twice (end of one featureline, beginning of the other)

The lack of data on the curve is control by the tessellation and mid-ordinate distances...
Matthew Anderson, PE
Product Manager
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