Data Extraction Question

[RobboP]

Hi all

I have a question that may sound simple to some, but it is causing me nothing but grief. I wont go into the end use (unless you want me to elaborate if req'd), but what I am looking for a solution to is this:

I have a series of 4 sided 3d polylines. Each point on these polylines is different in the 'z' axis. (In effect if I convert these to surfaces, they look twisted).

I am trying to use data extraction to separate them in a table and show all their single line dimensions (ie all the 4 lengths that make up the 3d polyline).

Am I missing something simple here?

Cheers

Rob

[steven-g]

I have no idea if this will help, within your workflow but at least in LT exploding the 3d polylines exposes the true 3d length when reported using the list command.

[BIGAL]

Use this pline co-ords its has a 3d option its then a maths thing to work out the true 3d length. Lee-mac has a really good pline data extract it may do 3d.

 

Removed whilst I figure out incorrect answer.

Edited December 21, 2016 by BIGAL

[RobboP]

Thanks for that guys.

Steven-g - I cannot explode the 3dplines as I need the table to keep the 3dp's a separate objects.

For example, the table will read something like this:

3dpline 1

Length 1 = ???

Length 2 = ???

Length 3 = ???

Length 4 = ???

I am assuming once exploded I cannot keep the 3dp's separated in the table. I hope I am making sense here. :-)

 

 

BIGAL

Thanks for that. However I do not know what to do with your Code. I have never does lisp's (if that is what it is). What do I do with that data? Copy and paste it somewhere. (feeling stupid now).

 

 

Cheers

[RobboP]

Just another comment.......it seems silly that this info is not in a polylines properties, or at least easily available. After all AutoCAD would be adding them all together to show us a total 'length'.

[andy_06]

I have used the code and it is almost what I am looking for. Ideally I would like it to give the whole length of the polyline instead of breaking it down into the segments if possible?

I also have a query regarding the lengths that it gives. I tested it on a Polyline that is 28.074m in length but the code says that it is 35422259.67. I am not sure if I am missing something here?

[BIGAL]

Code removed while I double check it. I thought you were asking for individual lengths as per 1st post. Any way try this copy and paste to command line it wil run automatically

(alert (rtos (vla-get-length (vlax-ename->vla-object (car (entsel "\nPick pline")))) 2 2))

[andy_06]

Code removed while I double check it. I thought you were asking for individual lengths as per 1st post. Any way try this copy and paste to command line it wil run automatically

(alert (rtos (vla-get-length (vlax-ename->vla-object (car (entsel "\nPick pline")))) 2 2))

 

Hi BIGAL,

 

That works and is the sort of thing I am looking for. I know this is asking a lot more but what I am ideally looking for is something that can do this for multiple polylines (I could have hundreds in a drawing) and also tell me the length between each "GN" block and the label nearest to it.

 

So it is an extension of the code in this thread:

 

http://www.cadtutor.net/forum/showthread.php?98802-LISP-to-count-MTEXT-amp-Polylines&p=675625#post675625