AutoCAD Civil 3D :: Spiral Curves - Perpendicular Versus Radial
Feb 22, 2012
why a line drawn perpendicular to a spiral curve in C3D is not radial? If so, what is it perpendicular to? It can result in several feet of difference.
Also, labeling an alignment along a spiral using the automatic routines appears to run perpendicular (whatever that is - not radial).
Perhaps I'm not looking at the math right (its been awhile since spiral curves in college) but it seems to me that a curve of diminishing radius should be labeled radially. Is that not how C3D sees it?
The only other thing I can think is that C3D is running perpendicular to the small tangents or arcs that it puts in to approximate a spiral curve.
C3D - 2014, Sincpac Addon
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Jun 23, 2012
I need to reproduce an alignment shown on some plans. I have not had any luck finding a tutorial about how to re-create an existing alignment.
I have a page of plans, it shows the center line going from a back tangent, into a spiral, through a curve, and spiral to tangent. How do I create an alignment from this data?
Spiral Curve
Delta: 1d33'47"
Length: 250.00'
o=0.57'
t=125.00'
Total Curve:
Delta: 24d09'01"
T=10105.34'
L=2,181.34'
o=4582.63'
Main Curve
Delta: 21d01'27"
D=1d15'02"
R=4582.06'
L=1681.34'
Spiral Curve
Delta: 1d33'47"
L=250.00'
o=0.57'
t=125.00'
I am a surveyor and I'm having a hard time understanding the alignment creation tools, in my data collector it is much simpler, you enter the back tangent and the end radius and the length of spiral and whale, but I'm trying to build a corridor, so I can stake the dtm.
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Jul 5, 2013
1. We all understand that designing highways is not simple and I don't know in your country but in my area almost all the bridges come at an angle from the alignment/corridor. Now, how can you do that in Civil 3D ?
2. Can you insert an entire shape, let's say a culvert into the design / corridor and be able to show it in the 3d view preciselly like it will be in real ? what about showing it in profiles or sections ?
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Nov 28, 2012
I have an alignment going up the center of a draw. I'd like to extract cross sections of this alignment and existing ground. What is a good way to do this?
I don't do cross sections very often, so when I need one, I draw a second alignment perpendicular to the first and profile that alignment to give me a bare bones cross section. I'd like to do these cross sections on a given interval, and at every change in direction. How should I go about it?
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Jan 28, 2013
I have a pipe network and a profile for it. Some of the structures have 2 inlet pipes. The pipe system more of less goes down a road, so every now and then there is a cross pipe into a structure. I have masking turned on under the structure style->profile setting. I want to see the cross pipe, so I found on here that all I need to do is under structure style->view direction (profile)->make Structure Pipe Outlines visible. I did that and still no cross pipe shows up. If I turn the masking off it is there.
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Apr 7, 2010
Any way to raise/lower a surface, but is there a way to offset a surface basically 1m (to make it easy) perpendicular to all grades? Because when you raise/lower a surface, if you have a 3:1 slope, it will raise/lower it vertical 1m or so, but then the perpendicular distance between the 2 surfaces is less then 1m.
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Feb 11, 2012
I am working on drawings where we create dtm's from surfaces, use the dtm for layout, shoot the asbuilt of the final surface, and then compare hundreds of shots to the surface to develop an as-build report.
I want to be able to select a mass of points, compare the perpindicular difference in elevation to the surface, and have an excel spread sheet generated from the results.
My coworkers are able to do this in Terramodel but I am on a mission to eliminate Terramodel from my day to day work.
Windows 7 x 64
Dell Precision M6600 Mobile Workstation
16 GB Ram
i7 @ 2.5 ghz
Civil 3D 2012 SP 1
Civil 3D 2011
Autodesk Inventor 2011
AutoCad Map 3D 2011
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Dec 9, 2013
I have my alignment running up the page, it is the red line. I can show the profile of the pipes and structures that run with the alignment but I want to she the elevations of the crossing pipes, not just the circle in the structures where they cross but the elevation of the crossing structures and pipes, (str 102-103 and 104-105). Almost like a profile that is cut and looks north (up) instead of the cut looking east west.Can I turn my profile view or take a view at a certain station or do I need to make alignments that run east west to do this? I have included a pedicure for reference.
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Mar 18, 2013
I have a drawing (c3d 2013) provided by a subcontractor that contains high density laser scan data in the form of Acad solids. I have a bunch of conventional QC shots on the same objects, that I would like to compare to the scan data.
I can bring the QC shots into the scan drawing as cogo points, but when I try to measure the distance to the face of the solid, I can't get the perpendicular 3d osnap to grab the solid.
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Nov 30, 2012
I'm looking for a way to determine (and preferably edit) the values of P1 and P2, the offsets of the initial tangents into the PC/PT of the shifted curve. It's not in the (admiteddly basic) book I have either.
[Edit: OK, after double-checking,I just found Widening offset clothoid, but I'm still none the wiser.]
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Aug 29, 2013
I draw an alignment for road. I turned off design criteria and i used data from manual for my country Slovenia. I need spiral in, curve and spiral out on alignment. Finally i got that alignment. Then i insert sample lines along the alignment. Then i saved autocad civil 3d file and shut down the program. When i reopen file, i see that sample lines after the spiral in being erased. Sample lines stayed along first tangent, after that they were erased.
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Jan 17, 2013
I'm trying to model a tunnel network and I have come across a problem . The problem is best described with an example:
A sort of tunnel - or shaft - has to be blasted in order to make an access between the ground surface and a certain parking cavern. This access will be an escalator and the tunnel will be blasted in a 30 degree angle to the horizontal level. Normally when I design tunnel cross sections (CS) the contractor will blast the designed CS perpendicular to the designed profile.
I drew the tunnel CS with sub assembly composer and created an assembly in civil. I then made an alignment and a profile according to our design. And here is the actual dilemma: Civil draws the assemblies so that the assemblies are vertical and what I need is them to be drawn / modeled perpendicular to the designed profile. Is there a way to do this?
I will attach a .pdf and a .dwg of a surface profile along the alignment created (and tidied up) with civil 3d, in which I have tried to illustrate the problem in case my description isn't clear enough!
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Oct 17, 2013
when creating a pipe network, and the slope of the pipe end is say at a 35% from start to end, the crown of the pipe is at a 90 degree angle from the invert elevation (straight up). So if I have an invert elevation of 288.3' the pipe crown elevation is at 292.5'. I need to show the end of the pipe crown perpendicular to the invert elevation so that it reads 292.0'!
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Aug 20, 2013
I need to place points automatically and in order sequentially along an alignment and I need to generate data from the points relative to an adjacent alignment. SO, two alignments, adjacent but not parrallel to each other. The data would then be point #, sta and offset from the adjacent alignment with the points placed in order and by window or crossing. I have a few thousand to place so one at a time would be an undesireable solution of course.
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Oct 10, 2012
I need to change the radial acceleration value in Civil3d when designing for super elevated bends to shorten the transition of a track. I can calculate the transition manually but is there a way i can input this data in the design criteria while carrying out the alignment geometry design in Civil 3d.
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Dec 5, 2013
how to get C3D 2014 to label a radial bearing? I guess I could dream up an expression using the start Northing and Easting and the Center Northing and Easting, then converting from decimal to DMS
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Nov 13, 2007
I dont have it in my custom shapes and was wondering if i would be able to download it from some where.... anybody know where? need the radial blur like in this background.
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Sep 12, 2013
I know I can use "<[Geometry Point Entity Before Data(CP)]>" (or after...) .
But this text is tooooooooo long.
Is there any way to get only the :
- radius - length of segment. or - Spiral A ???
Maybe using expressions? In this case any hidden elements?
I know I can use segments or multiple segments but I want to do the work in only 1 labeling step ...
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Jul 3, 2013
I have got a drawing with an alignment containing spiral-curve-spiral entities. I need to find what type of spirals are used in these entities - clothoids, cubic parabolas or other. Is there any way, to find it? In panorama and sub-entity editor there is only spiral description without exact type.
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Jul 21, 2009
Any way to add a (R) to the Bearing dislpay, to indicate a radial bearing, in a Line Table?? This would only apply to certain lines, not all of them. I can specify which line. That function does not need to be automatic.
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Sep 11, 2013
I'd like to view the parameters of my aligments elements near the geometry points. That is, the station and the radius value or spiral parameter (or what I want). I have explored the text & reference text but there is not R or A elements...
How is it possible ? C3D can detect the type of geometry poinr, so it would must to know R, Lenght,. A, etc....
In addition I 'd like to do it using the aligment label set.... sci-fi , isn't it ?
When you have to create plans, the aligments need to show a lot of information. Doing it manually is so boring..... (and in XXI century ...... )
Civil 3D (2013)
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Aug 23, 2012
why I get these unusual radial lines showing up in my plot preview. The drawing looks fine on the screen but when I go to plot I get hundreds of lines that converge to a point in my preview.
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Oct 29, 2012
I am wanting to draw lines from gun setup to the back sight, and then from the gun to all the radial shots that were taken from that setup. I would like to do this as automatically as possible. (i.e. a bunch of radial lines from the gun to each individual shot from that setup).
Our raw files are in TDS format. I could do it manually by using the transparent command 'PN, but I would have to draw a line from the setup to the shots individually.
Otherwise, I could write a lisp that asks me for the setup pt number, and I could give it a range ot pt #'s and have it draw lines from the gun to each of the pts in the range. (that is, if 'PN works in lisp).
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Sep 28, 2009
I want it to be "Angle Right" instead of "Azimuth".
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Mar 18, 2013
How to get a tangent bearing or radial bearing to show up in the legal description writer? All I can get are their opposites. Is there some code that I can add that will swap their direction (say NE for a SW)?
The convention out here (OR/WA) is to show a radial bearing (from the PC to the radius point) or a tangent bearing (into the beginning of a curve) for any non-tangent curves. So far, I haven't been able to figure out how to do this automatically.
Also, any good guide or list of variables for using the Parcel Reporting for legal descriptions in c3d? I really want to know what ALL the different pieces of data are that I can use in the legal writer, and how to manipulate them.
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Jun 14, 2012
I have a drawing in metric but I want the results in feet and inches, do I draw it in metric and have Autocad spit out a feet and Inches drawing, is that even possible. Or do I do the conversions up front and explain to the client that he will get his metric drawing back in feet and inches.
Second part, if the drawing is in metric do I open the Autocad Civil 3D metric icon or does it matter. Where I can read up on why there is a metic and imperial Autocad icon?
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Mar 1, 2012
what is the main advantages and disadvantages of these two programs.
Because i actually want to focus of someone of these two programs
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Feb 28, 2013
What is the difference between Annotation Text versus the Civil 3D Lables? Do you have more control over the annotation text? Do lisp routine work better for annotation text than the Civil 3D Labels?
I have a routine that will create a quick leader and text from the object layer that it selects.
Layer EX-PAVEMENT ----> the quick leader call out would label it as Existing Pavement.
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Jan 3, 2013
I am trying to standardize the company I just started with and I believe the Named Plot Styles are definitely the way to go, rather than Color Dependent.
Now, the question I have is when I created my Named Plot Styles, I created multiple styles with different lineweights. I plan on creating a base template with layers and have the lineweight based on the plot style. Is the correct way to handle it? Because we work for a certain large state DOT and they do things slightly different. They have only 2 named plot styles (existing, proposed) and change the lineweight directly in layer rather than the lineweight being dependent on the plot style. Now truthfully, there is no difference that I can see in the plot styles they created except for the description.
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Dec 13, 2013
I'm trying to create a custom expression in a structure table that will list the "size" of the structure, wheter it be a circular or rectangular structure. My column simply states size and I want it to label 5' for a circular or 4'x4' for a rectangular (or whatever the specific sizes are). The thought was to create an IF function, but Structure Shape was not available to use in expressions (among other problems). Short of using the description field (tedious) as a workaround?
In this example - CB-104 is a rectangular structure and CB-106 is a circular. I'd like the CB-104 size to read 4'x4'.
Civil 3D 2014 SP1
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Mar 21, 2013
We're working on a project which is causing me to question our management "system" (more like lack there-of). There are about 4 Existing Surfaces and 3 Design surfaces, and a half dozen or so drawings needed to show the various elements of this construction project. In the past we've done either copy and paste to show the same surface in different layouts or had a number of layout tabs. (Which quickly get pretty annoying if you're trying to show too much "different stuff" in each layout.
Looking at Data Shortcuts...we've never used them. When we have to make last minute changes everything automatically "updates" right? And the drawings should load faster and crash less because they're not so huge, right? The only Major Drawback I see is this: we use one person's workstation as the server" so two of us refer to the M drive path and one refers to the C drive path. Would this just screw everything up as it does when we have xref images? (Have to relocate the file path every single time the C drive person saves the file in order to see the image) I understand using "relative path" should fix this, but I haven't had much success with it.
And LandXML export/import, what exactly is the difference between this and a Data Shortcut?
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