Is there a video on teaching how to build surface from CAD cross sections?
There may be one on Trimble Library but I am not sure on that. I can likely do one over the weekend and share that with you but in the meantime here is my training package on this that covers the process and has sample files etc that will show you how to do this
The key elements are
1) Import the CAD DAta
2) Clean up the CAD data to get what you need well structured and to "fix issues with the Cross Sections" so that they will convert correctly
3) Layer the data so it is easy to select the elements required for the conversion process - Grids, Labels, Station Labels, Finished Grade, Existing Grade, Subgrade surfaces
4) Use the Track Top Surface and Track Bottom Surface functions to find the Top and Bottom of the Design as Surfaces - so you can get the Earthworks and Subgrade Volumes from the sections.
5) Run the Conversion Process and check the results.
Note that when TBC v5 releases, the Stored Cross Sections created by this process will be visible to you in the Template Editor (which is very useful).
Once the Stored XS are created, then you can set properties on the Stored Sections as to how you want to interpret between them - there are a number of options in the properties of each XS. Depending on the XS different settings will give different results. There is a bit of trial and error in there to get the best results
Making a surface is as simple as selecting the XS for a Material Layer and creating a surface from them - same as any other data - however surfaces made from XS can be problematic depending on how complex the surfaces re and how many XS you are working with.
Typically making these surfaces Alignment Based and then Densifying will make a better surface - however be aware that surfaces from XS can be hard if the XS vary a lot from Station to Station
I do want to have Volumes Computed from End Sections based on the XS only without any surface creation being required - I believe that that is by far the best model for earthworks from XS for Takeoff purposes - does anyone have any views on this or ideas around that subject?
Enclosed is a video on how to create Stored Cross Sections from CAD Cross Sections (these could also be Vector PDF Data Cross Sections also). The video also shows how to build surfaces from the Stored Cross Sections and the potential pitfalls of doing that - With some thought about how to edit the CAD Cross Section Data, you can create Stored XS that provide useful data to create a model from - it depends very much on how frequent the cross sections are placed and how well the source system generated important "additional sections".
Bear in mind that e.g. Cross Sections every 50' will not represent the starts and ends of features (like islands or ditches or gore areas etc at all well), but they may represent Pavement Areas OK (to a usable extent for Takeoff), but Cross Sections will never give you a good enough model for Machine Control
Hope the video helps
i am trying to do this but it wont work, do you know why? It just says that my station value is wrong. I have tried to move it (Above and below), change the point and comma and text style but nothion helps. Can you help me?
I cant figure this out, it does not work for me. It must be something i am missing here.
is there a way to add a more manual approach to create a stored cross section without selecting grid lines and text items? I mean just punch in a chainage, select a poly line in plan view and use the snap function on that line to define where it sits on the alignment. If I have just one cross section or from a software that isn't producing nice grid and text items than the current automatic process is too complicated or not applicable.
In the following example I don't have grid lines but CAD Dimensions.
In this example you have a "No Grid" type of section. In the next release
you can use the Baseline (Elv 695) and the Offset Zero Line and any
linework to create 3D Lines from Sections. In a No Grid scenario you need
to know the Hz and Vt scale. You also need to know the Vertical Datum
Elevation - it can be text like in this example (695) or you will be able
to elevate the Datum Line to 695 and the offset 0 line to 0 Elevation and
the routine will pick it up from there in the absence of text. You can use
a Dimension Line to act as the offset 0 line.
If you can send me the file - I can create you a Video of how I would do
this. You can convert Section Drawings to 3D Linework in the upcoming
release and then we have added 3D Modeling and 3D Editing Tools to make
models from sections easier. I will be posting training materials after
next weeks PUG in US on this.
On Thu, Oct 17, 2019 at 2:06 AM firstname.lastname@example.org <
thanks for the offer. It's not that urgent, was an internal training exercise. And if there are going to be changes with the next release I'll wait and test them and get back to you if there are still questions.
Or would you like the data to create your training materials?
Would like to test your type of data with the new tools
On Thu, Oct 17, 2019 at 9:13 AM email@example.com <
here a 7 day link to the archived project on our TCC.
Not sure what software they used to create the cross sections. I can try to find out if you want.
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