Hybrid parallel

[PGia]

Hi again.

This may also happen to others: sometimes I have two polylines and I need to get something like a common parallel to both. A sort of hybrid parallel from the original two.

Is it possible that this topic has been discussed in the history of this forum and there is a LISP to solve this problem?

 

Thanks in advance.

[mhupp]

Posting a drawing would help to be more clear with what your asking for. but maybe this is what your looking for. PAV

Edited 6 hours ago by mhupp

[PGia]

1 hour ago, mhupp said:

Posting a drawing would help to be more clear with what your asking for. but maybe this is what your looking for. PAV

 

This?

[PGia]

Perhaps the most appropriate description is to obtain the axis between 2 irregular polylines

Edited 4 hours ago by PGia

[pkenewell]

Look into this post for ideas:

 

[Nikon]

37 minutes ago, PGia said:

Perhaps the most appropriate description is to obtain the axis between 2 irregular polylines

       

pltools.lsp centerPline.LSP

 

             

Edited 4 hours ago by Nikon

[PGia]

41 minutes ago, Nikon said:

       

pltools.lsp 201.88 kB · 2 downloads centerPline.LSP 10 kB · 2 downloads

 

             

 

@NikonThanks for the code.

I tried it. But it only works sometimes. And if the polylines' first point coincides with the last, it doesn't work.

Is it possible that I'm doing something wrong?

[PGia]

52 minutes ago, pkenewell said:

Look into this post for ideas:

 

@pkenewell Thanks for help.

I downloaded the latest code from link and loaded it, but it doesn't seem to do anything.

I probably don't understand how it works.

[PGia]

I attach an example

Example.dwg

[Nikon]

1 hour ago, PGia said:

I tried it. But it only works sometimes. And if the polylines' first point coincides with the last, it doesn't work.

Is it possible that I'm doing something wrong?

The code does not work correctly with polylines that have a large number of segments.

Example1.dwg

[pkenewell]

1 hour ago, PGia said:

Thanks for help.

I downloaded the latest code from link and loaded it, but it doesn't seem to do anything.

I probably don't understand how it works.

 The "MC" command by roy437 works for me on your example drawing. You have to set the point resolution (prompt for "Specify Length for arc(ds)") to improve the results. I used 0.1 for pretty good results.

Edited 2 hours ago by pkenewell

[PGia]

54 minutes ago, pkenewell said:

 The "MC" command by roy437 works for me on your example drawing. You have to set the point resolution (prompt for "Specify Length for arc(ds)") to improve the results. I used 0.1 for pretty good results.

 

@pkenewell Thank you very much.

I finally got it working.

In my case, I set the "length of arcs" to 1. And it worked. But I think the resulting axis isn't very geometrically rigorous. I've attached an example image:

-The polyline created by the command is shown in green.

-The correct geometry of the axis is shown in dashed red.

 

I think there should be a more geometrically rigorous solution in some older Lisp.

Is it possible?

Does anyone know of one?