AutoCAD Civil 3D :: Difference Between Contour And Surface Smoothing
Apr 21, 2013
Which is better to do: contour smoothing or surface smoothing? I did a little test with a surface with no smoothing, a surface with contour smoothing set to medium, and a surface with surface smoothing. The results puzzled me. The contours in the surface with no smoothing matched the contours of the surface with surface smoothing. The profiile of the surface with no smoothing matched the profile of the surface with contour smoothing. Are these results typical? I was surprised that the contours of the surface with surface smoothing didn't look smoother. I was also surprised that the surface with no smoothing and the surface with contour smoothing generated the same profile.
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Apr 25, 2013
I am having an impossible time smoothing a surface created from feature lines in the attached file. I can smooth the service in parts except for the area that I’ve hatched – as soon as I try to smooth that area the drawing freezes or I get a fatal error. Ideally I’d like this surface to smooth to a 3x3 grid.
The things I’ve tried:
- Exploding the feature lines to 3d polys and recreating them as feature lines before adding them back to the surface.
- Copying the feature lines to a new drawing and creating a new surface
- Completely deleting the feature lines and manually re-drawing them from scratch before adding them to a new surface.
- Adding the feature lines with different supplemental distance and mid-ordinate distances (typically I do 2’ and 0.01’ respectively)
- Smoothing the surface in sections instead of one global smoothing of the entire surface (it always fails when I get to the hatched area)
- Smoothing the surface with different grid dimensions.
- Emailing the drawing to coworkers to see if they can create the surface and smooth it on their computers
- Combinations of all of the above.
64-bit HP Desktop - HP Z420
Intel Xeon CPU E5-1620 0 @ 3.60 GHz
24GB RAM
AMD Radeon HD 6570
Windows 7 SP1
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Apr 27, 2011
I have a drawing set to UTM83 Zone 14 Meters and my drawing units is set to meters also. I created my surface from my point cloud. When i do the contour extract feature (surface object extract), the contours elevation is in the wrong datum or elevation? The surface contour is 620 but the same extracted contour says 188.97? Curious why this happens. It seems to me that it is back calculate elevation or datum to a different coodinate system.
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Mar 2, 2012
I have Civil3d2012 and have created a surface in one drawing and then referenced it to another. It appears to be working, but the contour labels will not work on the drawing where the surface is referenced. I have all the appropriate layers on.
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Jul 8, 2013
I just upgraded to Civil3D 2014 and Windows 8. When I create a TIN surface using a DEM file no contour lines are displayed. Points are processed and triangles are created and can be displayed but no contour lines. Contour line layers are set to display in the style file.
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Feb 24, 2012
I have drawing giving to us for a senior design project. I'm trying to create a surface to so that I can analyze cut/fill. Not sure if what i'm doing is right or wrong, I've never used civil 3d. But i'm getting break-line errors whenever i'm trying to create the surface from the contour lines.
Heres a link i took of what i'm doing on youtube [URL]........
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Mar 4, 2012
I am using Civil 3D 2011 and wondering how to create just one contour on an existing surface at a specific elevation. I need to show where floodwaters would get to at a specific elevation so that contour would be the easiest way if I can contour the surface with just 1 elevation. I don't want to have to create 0.1' contours all over the site and then remove all the extras.
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Mar 29, 2012
So I have an existing grade surface and I am laying out a number of different site designs. I've got all my surfaces from those site designs on different layers each displayed in a different layout. I need to label existing contours on each layout in different places. I've setup additional contour label styles (two for each design, major, and minor) and layers (two for each design, major, and minor). However, when I add labels to my existing surface, they come in on the right layer, but whenever I freeze any of the many layers my contour labels are on, they all turn off. The only workaround I can figure is to make copies of my existing surface for each design option and label each independantly. However, this is inacceptable as far as data management goes, since my one file will be hundreds of megs with all those surfaces.
Windows 7 x 64 bit
NVidia Quadro 2000 Dual Monitor
6.00 GB RAM
Intel Xeon W3550 @ 3.07 GHz
Civil 3D 2013 SP 2, Civil 3D 2012 SP2, Civil 3D 2011 V3, Civil 3D 2010 V3
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Nov 26, 2013
I have 400 files each represent a tile of contour at 0.5m interval, if I xref all into one dwg it is extremely slow. These files have some 3d blocks which represent xyz and I made a .net program to open each file with "readdwgfile" method. However turned out that the points are not dense enough to generate the same accuracy contours as the 0.5m contours.
I am going home now to use my home computer and see if it can handle all these files xrefed and then bind and explode.
Worst case in make another program to extract only the contours and insert into a blank database. Always difficult when not given raw lidar point files.
Total size for these contour files combined is 327mb.
We have microstation capabilities not sure if it can put in the file in an easier way. I can work with the xrefed bogged down file. But is there a way to only export what's shown ? I have frozen the layers for all other objects from all the references.
I estimated total points from contours will be 20 million. Since each generate about 50000 points. Which is still workable. The computer i use in the office just make this more difficult. Slow cpu. Difficult day. Spent 7 hours programming and got it figured out but didn't solve the problem. I should have known better 20 points are not enough to generate that look in the 0.5m contours.
Civil 3D 2012
Work: Xeon W3503, 12GB, Quadro 2000, Dell P2211H x 2
Home: 3930k, 12GB, GTX 590, U3011, QX2710
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Feb 11, 2013
I'm working on a topo survey and the contours are crossing each others (See attached pic) and what I did was edit the surface by adding points. I know that these points are fake, but how does this affect the terrain surface for design point of view? I did try swapping edge and deleting lines but makes it worse. Also as you can see in the pic, I don't see the added points like it did back C3D 2008.
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Nov 7, 2013
How to start pit excavation on a contour surface ?
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Jul 28, 2011
I would like to create surface from contours and extract points (with value) from on it. I had contours in my drawing; each major and minor contours are single polyline with elevation (Z value).
If I create surface form CONTOUR, some polylines (major or minor) are not included in to surface. After the creation of surface, I tried to erase the existing contour lines (Polyline) from drawing but the surface will be disappearing.
If I create the surface from ''DRAWING OBJECTS'', I'm not able to select the polylines (attachment 01) .
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Oct 24, 2013
I have this contour lines from dwg file (see attached) and I am trying to make a surface out of it. Initially i thought it is already a surface for C3D but i cant seem to follow tutorials. While browsing for solutions from the Internet, it seems it is not even a contour file that can be added in C3D. what is this file and how i can convert it into a surface in C3D?
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Jul 24, 2012
Is it possible to weed contour lines displayed in a surface based on the slope? I am having an issue plotting construction plans due to steep cut slopes and flat adjacent areas. I have several cuts ranging from 33%-50% adjacent to flat areas around 1%. Due to the drawing scale required by the client and the .2FT and 1FT contours required to detail the flat areas, my steep cuts appear as dark hatches due to the tight contour lines.
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Nov 6, 2013
How to use the Surface Contour Label Group class in the .NET API.
My first guess was that I had to create an instance object of the class and name it, and then use a "Create" method (e.g., CreateMultipleAtInterval) from there, like this:
Dim labelgroup As SurfaceContourLabelGroup
labelgroup.CreateMultipleAtInterval(arguments)
However, this doesn't work, as Visual Studio told me "Warning: Access of shared member, constant member, enum member or nested type through an instance; qualifying expression will not be evaluated."
I tried just saying:
SurfaceContourLabelGroup.CreateMultipleAtInterval(arguments)
But that didn't seem to work either. How this class works and get it to add some contour labels to a drawing?
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Mar 2, 2012
I created surfaces in Civil 3d 2011 for existing and proposed and I did a surface volume between them. Is it possible to create a specific contour in the volume surface that represents the fill volume elevation (daylight line I think)? My proposed surface is a flood water elevation and I need to define the boundary at that elevation.
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Jun 20, 2012
Is there a way for Civil3D to create/generate/extract a contour of a specific elevation such as 105.53 from an existing surface?
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Aug 21, 2012
How do you apply certain contour label styles to certain surface styles (i.e. When I have an existing surface i want the default contour labels to be an "existing contour" style). Right now the default is a "finished contour" label style for all surfaces.
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Jun 6, 2011
I am making vinyl decals and for some reason I am so confused about "contour and cut" which is which ? I need to know how to put a line around an object that will be a cut line .
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Apr 2, 2012
I've been trying to lay a mesh on top of some contour lines. I've also tried the loft command, but with little success.
I've tried several terrain plugins, but they all seem to malfunction because I have overlapping contours. Here is the dwg, what I'm trying to make.
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Jun 25, 2011
I'd like to be able to create a surface or mesh from contour lines to give a better 3D representation of terrain than just contour lines. "Drape" seems to be the tool ACA, but I'm wondering if AutoCAD can do something similar. LOFT sorta works, but even then, I have to do it in sections, and I'm not really looking for a solid.
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Apr 19, 2012
Any way to fix this (Picture 1) in either at the poly or subd stage. I have experimented with bevel and can reduce it but is there a way to smooth it out completely.
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Jun 6, 2012
what is the difference between group, composite and surface in COPY OBJECT option in ipt?
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Mar 24, 2013
How to convert a 3D Polyline contour to Polyline contour.
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Nov 5, 2013
I want to do a simple thing : drop ortho-photo on surface generated from contour line.
First thing, I need the basic terrain. I did import my contour line in a new draw, using the import map feature. I then saved the draw under the name " topo ". At this point, the contour line are 2D break line with no elevation.
I then opened a new draw to which I did associate my draw " topo ". Then I used a query to modify the elevation of the line using the attribute " contour " in my table, thus resulting in my breakline to become 3-D. It works fine. Then I save the new draw as " 3D_Topo ". I then get a warning :
" The association between objects interogated in the current drawing and associated will be deleted once the current document of the draw is closed " (I made the translation from french to english, in french it stated like this : " L'association entre des objets interrogés dans des dessins courants et associés sera supprimée une fois le fichier de dessin courant fermé. " ).
Well question #1 : What does this warning mean / imply ?
Then, I have those .ecw files as ortho photo which I want to import. So I use the function " connect " with raster image, then I select my file, then I " add to draw ".... then something very strange happens.
Sometime, the image appears correctly...and some other times I get nothing and I get this " disconnected " message in the task pane ..and no matter how many time I actually connect again the .ecw files, it will not happen in the draw ! Then I simply close the draw, start map 3D again, then I do the exact same thing, and sometime it works, sometime it doesn't.
Question #2 : any clue on why the .ecw files sometime works, sometime doesn't?
Now, let's assume I finally made it to connect correctly and that Map3d didn't crash whilst I was doing it (because I don't know for you, but here, it does happens quit often), I now have (as shows in the picture I attached) two thing. A surface made (well, I went back in the civil 3-D module to make the actual surface from the breakline definition) with the contour line and a imported image. I now want to drap the image on my surface! So I use the option " drap " which is in the surfaces option (in the ribbon surface tools)... well it looks nice since it propose me to use the surface I made up with the contour line as the base and the imported .ecw files as the file to be draped upon. So I simply do that and.... well...nothing happens! My image isn't draped at all, it stays there,
Question #3 : How should I proceed to actually drap my image over my surface ?
Question #4 : Considering I made it to drap the surface, how can I save this new draw independently of the attached other draw or database?
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Apr 6, 2013
I've been researching the options to deal with tessellation of my corridor. I see the option to extract feature lines from the corridor and to maintain a dynamic link.
I've now found a link in the docs for converting tessellated lines to arcs. Can I use this command with a dynamically linked FL? And will it maintain the dynamic link? [URL] ....
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Apr 4, 2013
I was looking through the docs and all it says is that this eliminates tessellation. I understand that and that's what I'm looking to do. But the docs don't give any guidance on what these numbers are for.
I'm talking about the three options under the "Smoothing" group - "Horiz Deviation", "Weeding" & "Arc Inclusion" (I'm looking at the 2010 docs as that's all I could find at the moment).
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Dec 2, 2011
I often have to do storm pond surfaces that (for the purposes of planning) are flat on the bottom. These surfaces are created from a combination of survey data and grading groups and the tin of these surfaces is perfectably acceptable. However, when contours are shown, the flat bottom is shown with contours jig-jagging all over the place.
The attached image shows a comparison of the same pond. The top was created with survey data and grading groups; the bottom was created using contour data only. The generated surface on the top shows the bottom contour going in different directions and has parts where the an expected contour is missing.
How to correct/manipulate the surface to show a proper flat surface?
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Oct 22, 2012
Has instances where you set your tolerance for the maximum triangle lenth to say 50m to reduce the amount of triangles along the edge that run at long distances. When I do this I end up with multiple surface holes and I'm not sure why as there are points in the area.
I thought well maybe it's because i should've reduced my max triangles first then added breaklines. Would this matter? I also thought I could add a line to the surface to fix the holes vs. deleting surface lines along the entire edge of a surface for many many miles.
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Nov 14, 2012
I am trying to add points into a surface. I have done this before without any problems, but now I am having issues.
When I ID points which makes up the surface it gives me the correct Z level e.g. 24.5m, however when I hover over the surface it shows me the surface name and a different z level e.g. 0.65m. What is the reason for this difference in z levels? I think this may be causing the issue I am having when I add new points.
I select the surface and use the 'edit surface command' in the ribbon, choosing add point.
When I add a point at the level I require(23.89m), it puts it in a lot higher than the surrounding area, so I tried to put the point in to the lower z levels (0.4m) it puts it in a lot lower!
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Dec 10, 2012
My goal is coming up with the volume bounded by the design surface and the existing surface. I don't have the design surface modeled yet.
Do i need to create alignment offsets?. Alignment 1 profile view is also attached. Then Alignment2.
What about starting with alignment1 profile view? Since I have created a polyline as the design profile ?
how do I shrink labels? Where is it in the settings ; the Align folder had been check.
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