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

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.

messire

Hi all
Its getting confusing: the script is installed and delaunay2 installed.
The file is imported from an autocad file with simple points that i put in Z coordinates in acad.
When imported in SU they appears as little crosses ( cannot succeed in zooming on them to see exactly), and when i try to triangulate them, the ruby says " Some objects of the selection aren't construction points". How is this possible since they are all similar and all points?
Nothing happens then..

Is there any way i can resolve this?
I've put a sample from points ( acad) here if anyone has a hint!
http://dl.dropbox.com/u/2095112/3Dpoints.dwg

thnx
Nils

messire

Good lord!
I've found it!
3D points from surveyors are often blocks in acad. When i imported them, i forgot that, and they were in SU still components!.
A simple select all + explode solved the issue and made it possible to triangulate!

Relief!

Sorry for the buzz!
N

Gaieus

@messire said:

A simple select all + explode solved the issue and made it possible to triangulate!

Yup - I was already starting to write this up - good that I read the very last post.

mitcorb

I am tagging this for future reference.
mitcorb

ProfKi

I'm trying to follow this thread to create a 3D landscape. I have the survey points or 'crosses' in SketchUp, all in the correct x,y,z positions. I selected all and exploded the components without any problem. I then reselected all the crosses, and selected the 'Set Centre Point' - but it puts a single construction point in the middle of the drawing - not one at the centre of each cross.

I'm using SU Pro ver 7.1.6860

Can anyone see what I'm doing wrong?

Grateful for any pointers!!

D...

Gaieus

Hi D...

Do the other way round (provided that those components er the instances of the same component definition) as the order is important:

Edit one of them (double click)
Set the centerpoint inside in that component - now if they are all the same components, each should be updated instantly with this centerpoint in them
delete the geometry - i.e. the "crosses" - leaving only the centerpoint inside the component
NOW exit the component and explode all...