AutoCAD Civil 3D :: Point Limitation On Creating Surface From LAS Files
Jun 6, 2013
I am having a problem using 2014 civil 3D. When I import las files and create a point cloud, and go on to make a surface from those points, it is limiting the "number of points added" to 340134. I am using the lidar las files which each tile or file has an average of 12 million points, and I have tried to create a surface using one file, and up to 28 tiles (where there should be 340 million points). Regardless, one of the files contains 12 million points and I do have the "point density" set to 100, and the "real time density" set to 100. Why will it only use 340,134 points? I have tried all options from "point cloud extents" to "window" and same result. All the points from the cloud are there and displaying fine, it just seems civil 3d is limiting the number of points used for surface.
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Dec 13, 2013
I was given a job where i need to create a surface from a gis file. have been messing with my civ 3d 2013 a little bit and have been able to get a surface comprised of a bunch of polylines to appear (not a true surface). I will need to create profiles so i need a true surface. I downloaded a compressed shape file from the county and need to know how to insert this into a drawing and build a surface using my own surface style.
The files i have to work with:
.dbf
.idx
.prj
.sbn
.sbx
"autocad shape source"
.shp
"autocad complied shape"
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Jan 20, 2011
I would like to convert many xyz files, representing point clouds, to the isd files. I have found some dll's dealing with point clouds' objects (see bellow), however I could not find any supporting documentation.
Some sample code in VB.NET or direct me to some useful resources?
These dll's are, in my opinion, related to Point Clouds:
AcDbPointCloudDbxRes.dll
AcDbPointCloudRes.dll
AcMapPointCloudRes.dll
AcRevCloudRes.dll
AeccPointCloudEnu.dll
AeccUiMgrPointCloudEnu.dll
AeccUiPointCloudEnu.dll
Autodesk.Map.PointCloud.UI.dll
ManagedMapPointCloud.dll
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Jan 18, 2013
I have some data in the form of
point# | X | Y | Desc_1 | Desc_2 | Desc_3 |....... ect
I would like to make an excel table that i can create multiple points from and make that table dynamic, ie if i edit the table the points will change.I would be labeling the points according to the different desc_# in multiple drawings
Is there any way to do this? I have messed with creating a user defined property classification and creating a new point file format, but i want that point file I imported to be dynamic, and if I change values the values will change in all my drawings.
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Sep 15, 2013
I need to create a sub-set surface from my main surface. not sure what the vernacular is for a "subset surface" in c3d but i do have a feature line that bouinds the desired area, but that is as far as i can solve.
i did try creating a new surface - pasted the main surface in the edit definition, then deleted triangles until the boundary alighned wiht my featureline. This seemed to work, but when i view the properties of the smaller subset suface, it shows a mimum and maximum elevation that is incorrect.
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Oct 2, 2012
I am issues with DEM files that I am downloading from the USGS website.I download 24k, elevation for the area I need. I then choose staged 1 second, add a surface to a blank drawing, then upload the DEM files to the surface.
The surface imports correcty, but when I try to import points taken by a surveyor on the same drawing, they plot incorrectly.The DEM surface and the points from the surveyor do not correspond. Also, the DEM surface is in meters, not feet. I have tried changing drawing settings, datum types, coordinate types, etc.
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Aug 30, 2013
I have got a csv file and want to add to the surface but it says error in adding point file.....don't know what to do. Size of the csv is 13MB and contains about 0.2million points.
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Apr 3, 2012
Am I correct in assuming that if Surface Labels by One Point is chosen, the slope as shown is the maximum slope of the surface triangle where the point was chosen??
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May 28, 2013
I was asked to lable survey data with the (2D) distance between the design surface and the survey points of the finished ground.
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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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Mar 7, 2012
Is it possible to add points to a surface without adding them to a point group? I've got a bunch of ponds I'm doing and it will save me some time if I could just select the points, and not have to put them in a point group then add the point group.
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Dec 11, 2013
If I change a point or link code in one of my subassemblies, is there a way I can build my top surface using those?
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Aug 19, 2013
In the Surfaces Tutorials: Exercise 1: "Creating a TIN Surface". The first instruction is to click "NEW", which I did. I selected "Surfaces.dwt per instructions and clicked open. I have executed these steps a number of times to be sure I am doing what the instructions say. But, every time the same thing happens. "Drawing2.dwg" opens instead of "Surfaces.dwt". I also make sure the file type is set to dwt.
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Aug 1, 2012
If I use this code it will give me the insertion point for a block
(setq ent (car (entsel "
Select Main Object: ")))
(setq InsPt (assoc 10 (entget Ent)))
Now if I try to use this for a surface label and try to get the insertion point
(setq ent (car (entsel "
Select Main Object: ")))
(setq oEnt (vlax-Ename->Vla-Object ent))
(vlax-dump-object oEnt)
I dont see anything that will get the insertion point.
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Apr 29, 2013
I have created a new assembly that uses a HMA dike rather than your typical curb but my surface always begins at the top of the HMA pavement rather than the top of the curb subassembly. See Picture. Where's the setting to fix this (is it a daylight setting) or it is a bigger problem in that I didn't create the subassembly or assembly correct to begin with?
Win7 (x64), EVGA 790i, 8GB RAM, EVGA 8800GT, 250 GB iSSHDD, & RAID 0/1
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Mar 18, 2013
I think this should be an easy thing to do, but I am having problems figuring it out. I need to repath the location of a point file being used in a surface. My surface will not rebuild because it can't find the point file originally used. Drawing was used on a different computer system, so the point file directory is now pointed to the wrong path.
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May 10, 2012
I'm currently working on a site layout and came across a problem. The drawing that I have has the site layout with all the points and contour lines included. However, the drawing is exploded. Now, I want to get the point properties and surface properties from this file, but it seems like it isn't the original file and it has been edited. This file also does not come with a point file or surface file. Is there a method to get the point, surface or elevation properties from this drawing?
Also, I have heard that you can create a new drawing and create a surface to read the surface properties of the drawing. Is that possible?
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Apr 22, 2013
C3D Version 2012
Surface does exist as we can see the triangles/contours or whatever we choose to display. When we run the Water drop command, we are getting a message saying that the point is outside of the surface. We have selected a valid surface by both picking it visually and selecting it from the dialogue. All layers are on and thawed and we are picking well inside of the surface.
Why it would be telling us that the point is outside the surface?
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Jul 30, 2013
I have a grid survey of points and I've entered these points into Civil 3D. Now what I want to do is use these points to create a surface so that I can create a slope analysis of the surveyed area. My problem is that I can't get the points into a point group.
I have a generic grid (15 x 15) of points set up and I've only used a portion of them (defined by the dimensions of the site). So I want to create a surface that includes all of the points that aren't set at an elevation of 0.
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Jul 11, 2013
I am trying to create a surface from a corridor. I have a sub-assembly attached, which I believe is working correctly. I managed to create the empty surface and when I try to add surface data nothing seems to happen. I keep changing the specified code to Base which is my finished gravel structure and hit the + but again nothing seems to happen.
Ultimately I am trying to determine a volume between my corridor and original topo.
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May 27, 2012
I can't seem to create a planar surface that shows up in the tool space as a TIN.
Some background, I have a TIN of a pile of dirt that I created from a point cloud (it shows up in the toolspace under the surface section). I also have a plane that intersects that dirt pile which indicates ground level. I want to be able to calculate the volume of the dirt pile by creating a volume TIN with the ground plane and pile TIN, but the ground plane does not show up in the toolspace under the surface section so I can't use it to create a volume TIN. I created the plane with the planar button in the ribbon and manually lined it up with the pile.
How can I convert this plane that is clearly in my project but not in the list of surfaces in the toolspace into a TIN to use in a volume TIN?
I'm running Civil 3d 2013 and you'll probably have to explain things like I'm 5 because I'm not familiar with the interface yet.
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Apr 2, 2013
I have a project that I need to map the terrain as a tin solid so that I can do some cut and fill analysis. I have downloaded a orthographic and elevation data from the USGS website. I cannot get AutoCAD civil 3d to create the contours properly.
My current workflow is: use mapwspace to bring up the task pane. Connect to the geotiff image in the 1-153383539 folder. Then I try to create the contours and the option is greyed out.
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Dec 10, 2013
This is the first time I have imported a .dgn file into Civil. The drawing contains contours lines with Z elevation data. When I create a surface using this geometry (polylines + some lines) the surface seems to be scaled in the Z axis by 12.
For example pline (from dgn) is at elevation 46' but the Civil3D surface is 552'
I assume this is a setting in the Surfaces dialog box, but I cannot find it.
Also the elevation field in Properties from the dgn contours is weird. For example, in one area the (pline) contours display -28', 26', -24', -22', -20', -18' in Properties but Civil3D interprets this as a downward slope - which is the actual field conditions. I don't understand the conversion going on here.
The geometry of the pline and contours generated from the surface seem to line up in a side or isometric view (see attachment).
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Oct 1, 2012
Been chatting with an architect in my office, and he was asking me if we could make our TIN surfaces smooth. I cannot find a way, would it take a 3rd party program? He wants it like the image i attached. How to achieve this with a TIN surface?
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Oct 11, 2013
I have a finished grade surface created for my site but I want to lower the parking lot portion of it to subrade elevation. What would be the ideal way to lower a portion of a surface?
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Apr 24, 2012
I will try to write this as clearly and shortly as possible.
I have two surfaces created lets call them Surface A and Surface B.
They have different elevations in different areas, sometimes Surface A is below Surface B and other times Surface B is below surface A.
Is there a way to easily create a Surface C which is a combo of Surfaces A and B taking which ever surface is lower?
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May 29, 2012
I´m having problem with creating stl file from surface. I need to import stl in another program for rockfalls.
I have create surface from contours, then extract faces, extrude them, union and I got solid..
I have export solid like stl file... But in another program my surface is not smooth, like somethning went wrong while exporting stl, because in autocad civil 3D 2012 everything looks good.
I have found out how I can increase facetres to 10, but It has not affect to my stl file. If there is some another parameter for better resolution of stl files?
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Oct 30, 2012
They send me a file that has polylines as contours and when I try to do the surface adding contours an error appears saying that the breaklines couldn't be added because they crossed a breakline, I don't understand why.
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Dec 13, 2012
I have a surface based on a point cloud. I decided to add a few more tiles of data to the point cloud and was expecting that the surface would update (after rebuilding) to include the new extents - but there was no change. The surface doesn't have any boundaries or breaklines but does have edits.
Do I need to add points to surface again? Will this duplicate the orignal point data or would it just add the new data. I didn't want to lose my edits if possible.
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Jan 7, 2013
I know that there is a limitation on the numbers of points added to a surface from a point cloud. But I'm curious how Civil 3D determines which points to exclude from the surface. Is there a special alorithm/criteria the software uses?
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Dec 11, 2011
I have been searching for a solution to a problem i have been having. I have a point cloud, and I am wanting to TIN it to create a surface.
When I use the Create Surface tool, no dialog box appears. Everything I have found seems to rely on this Dialog Box. How to get it to display?
Using AutoCad Civil 3D 2011.
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