[Tutorial] Create a (TIN) from Surveyed Pts - using SU only

[azuby]

Open a simple Editor (not Word! It is NOT simple ). You can find one in Start > Programs > "Zubehör" (sorry, don't know how it is named in English) > Editor. Open the file "points_cloud_triangulation.rb", search for "./delauney2.rb" and remove "./" Save the file. You're done.

azuby

[todd burch]

I would suggest using Notepad.

[Gaieus]

Yes, most probably.

Now create a bunch of construction points, select them and run the script.

[Gaieus]

How big is that file?

[tinanne]

This is great information. I could have really used this last month when I was pulling my hair out tracing contour lines and raising each individual line AND THEN trying to mesh them together!

This is great!

[Gaieus]

James,

I have sent you an email, please, confirm the delivery...

[Gaieus]

@unknownuser said:

My problem was that the cad file didn't show up when imported .

Yes because all the Layers were turned off and nothing was on Layer0
I could hardly find those crosses anyway.

But now you are really in big problem because moving those points to the proper height will be very tedious. There are some 1800 of the (or 1300?) altogether. And you'll need to re-run the script too.

[andymaw]

Have you had any joy? I'm in exactly the same boat. A number of spot heights (not quite 1300 though!) all in 2d, trying to create an accurate terrain in sketchup

[Gaieus]

Can you not get the xyz coordinates as just a data file? Those guys must have worked with something as well!

[Anssi]

Depending on the type of the information in the DWG, it might not be very difficult to write an AutoLisp routine that would scan a DWG file for points or text entities, and replace them with some small geometric entity (a line, or cross etc.)at the correct height, that could be imported into SU and sandboxed into a TIN.

Anssi

[jmqrsq]

@unknownuser said:

Scripts reqd:
points_cloud_triangulation.rb
delauney2.rb
Work together - get latest versions
Download from here:
http://www.crai.archi.fr/RubyLibraryDepot/Ruby/RUBY_Library_Depot.htm
Thank you Didier.

I have tried to download the delaunay2.rb script but the links do not work anywhere. can someone send it to me? i can provide an email addy. thanks!

[Anssi]

@unknownuser said:

So ur saying Anssi that a 2D drawing with points, which is what I have, could be changed into a 3D drawing. That would save alot of work. Can that be done? The Z value would have to be added to each point though, and there are 1300!

It depends on how the 3D information is displayed in the file. For instance, I have seen many site surveys with the height information as simple text objects strewn around the map, or the height is in an attribute of a block. In both these cases it is possible to grab the 2D coordinates of the object, and use the text contents for the Z information, and draw something there that is importable to SU. A sort of "unflatten" operation. Of course the requirement is that the information is there in some consistent form.

Anssi

[Gaieus]

@jmqrsq said:

I have tried to download the delaunay2.rb script but the links do not work anywhere. can someone send it to me? i can provide an email addy. thanks!

There is a confusion (probably due to a typo somewhere) because this script sometimes is referred as "delaunay.rb" while other times as "delauney.rb".

Here is a post where lapx aslo asked for the delauney.rb (which I believe the proper name is) and I posted a copy of it.
Try that, hope it works.

[eugenesr]

Here is the file location of the script:
http://www.crai.archi.fr/RubyLibraryDepot/Ruby/delaunay.rb
http://www.crai.archi.fr/RubyLibraryDepot/Ruby/delaunay.rb

and here is the Ruby Script Index page http://www.crai.archi.fr/RubyLibraryDepot/Ruby/

Eugene

[andymaw]

Not been able to check on this for a while....

I've had a look at the drawing full of spot heights that I have and they are all at the correct z value....however, it is just text, not crosses etc.

Is there a quick way to create these crosses where the text is? I had a look at that autolisp, it looks mind boggling!

[Anssi]

This might be a bit OT as you need AutoCad...

I took an old Autolisp program I once made and modified it to do this:

Scan a selection for text entities. Read the text and convert it to a number and multiply it with an user supplied factor (for unit conversions). Draw a line from the text insertion point to the text upper right corner, using the text as the Z height of the line endpoints. Repeat until all texts in the selection have been processed.

The result should be a cloud of small lines that the SU Sandbox from Contours tool can cover with a surface.

How it works:

• copy the txt23d.lsp file somewhere where Autocad can find it. It should work if put in the same directory as the drawing file to process.
• type (load "txt23d") to the AutoCad command line and press Enter
• type txt23d and Enter
• It asks the user for a selection
• It asks the user for a Z scale factor

Disclaimer: The lisp has almost none error checking. Scale factor should reset itself to 1 if you forget to give one. It's not rocket science - the real height point may be not exactly at the text insertion.

Anssi

TXT23D.zip

[andymaw]

That did the job! Thanks so much for that. Just got to find the time to put the guide points into SU and it should be sorted.

Cheers again

[Rob D]

I could really, really, really do with that lisp script... but only have acad LT

[VicBStard]

How do I get a spreadsheet or comma separated x,y,z points into SU without having to actually position points manually? Is there a way to automate this?

Cheers

[Gaieus]

Hi,

Sure, use Didier's Cloud plugin; works great.