topic Re: Lines to Polyline in AutoCAD Forum

Lines to Polyline

redasobeh — Thu, 19 Jun 2025 15:14:18 GMT

I have some lines, polylines, and arcs,

I cannot convert them all to one polyline,

I try all the tricks I know, but it still isn't working!

Attached CAD File...

Re: Lines to Polyline

imadHabash — Thu, 19 Jun 2025 16:10:38 GMT

Hi,

These lines do not have the right conditions to convert for polyline. Click on below image to see what i mean.

PEDIT ( Join ) ... Adds lines, arcs, or polylines to the end of an open polyline and removes the curve fitting from a curve-fit polyline. For objects to join the polyline, their endpoints must touch unless you use the Multiple option at the first PEDIT prompt. In this case, you can join polylines that do not touch if the fuzz distance is set to a value large enough to include the endpoints.
PEDIT command. >> Click <<

Re: Lines to Polyline

TheCADnoob — Thu, 19 Jun 2025 17:59:14 GMT

in addition to @imadHabash observations, it looks like you are pretty far from the origin. This can cause issues. Is there a reason to be using such large number far from the origin?

https://www.autodesk.com/blogs/autocad/working-large-coordinates-in-autocad/

Re: Lines to Polyline

redasobeh — Thu, 19 Jun 2025 22:02:49 GMT

Does that mean there is no way to join them into a single polyline?

Re: Lines to Polyline

redasobeh — Thu, 19 Jun 2025 22:15:40 GMT

*Is there a reason to be using such large number far from the origin?

I don't know.

I try every method I know to join these lines and arcs, but all are useless.

Re: Lines to Polyline

j.palmeL29YX — Fri, 20 Jun 2025 05:09:04 GMT

@redasobeh wrote:

Does that mean there is no way to join them into a single polyline?

Correct, without some repairs there is no way.

1. the green arc is drawn at the wrong Z-value. (image_01)

2. The cyan arc and the blue polyline don't touch each other (Image_02)

3. The objects don't share the same XY-plane

=> So you can never join all 4 objects to a polyline

If you repair the drawing errors I mentioned above you could consider to convert to a 3DPolyline. But this object type (3DPoly) must not include arcs. So you have to substitute the arcs by a bunch of short line segments (as you have done in the blue polyline). Only this way you have a chance to get ONE object (a 3DPoly) for the curve.

Re: Lines to Polyline

redasobeh — Fri, 20 Jun 2025 11:45:34 GMT

Why, when I try to reset the values of the Z to zero for all these objects, I notice that they disappear and their positions change!

Is it supposed that if the value of the Z of a line is changed, this will affect its position as x and y?

Re: Lines to Polyline

j.palmeL29YX — Fri, 20 Jun 2025 13:58:04 GMT

@redasobeh wrote:

I try to reset the values of the Z to zero for all these objects,

Hmm, I don't know what you did and how, but because the arcs are rotated in the 3Dspace that makes no sense for me.

Attached a suggeston how I would do that.

(view in My Videos)

Re: Lines to Polyline

TheCADnoob — Fri, 20 Jun 2025 16:36:10 GMT

edit: response removed, i had wrong file...

If you don't need the 3D elements and just want a 2D line;

My suggestion is to convert the ars to polyline using PEDIT.

Next use the FLATTEN command to get rid of any Z values (getting rid of hidden lines)

Next re-attach end points

Then use OVERKILL command

Then use JOIN command

Re: Lines to Polyline

redasobeh — Fri, 20 Jun 2025 17:43:16 GMT

Thank you very much,

I appreciate you.

Re: Lines to Polyline

redasobeh — Fri, 20 Jun 2025 17:45:00 GMT

Thanks so much,

very very useful.

Done.

Thank you again.