topic Re: cannot convert a POLYLINE to a LWPOLYLINE in AutoCAD Mechanical Forum

cannot convert a POLYLINE to a LWPOLYLINE

KevinMacDonald — Wed, 06 Jun 2018 00:00:18 GMT

This is such an old and tired subject with a billion answers on the forums. And yet, nothing works for me.

The attached file contains a single POLYLINE. I would like to convert it to a LWPOLYLINE, so that I can then use the wonderful PLDiet.lsp routine on it to reduce the number of points.

CONVERT will not convert it.

CONVERTPOLY will not convert it.

Ideally, I would like to be able to convert ALL POLYLINE objects in one go to LWPOLYLINE objects.

Can anyone provide precise instructions?

Thanks

Re: cannot convert a POLYLINE to a LWPOLYLINE

KevinMacDonald — Thu, 07 Jun 2018 02:50:31 GMT

I have also tried FLATTEN. If I indicate YES to the "Remove Hidden Lines" option it does in fact turn a POLYLINE into a LWPOLYINE. But, it takes what was a nice smooth POLYLINE and turns it into jagged LWPOLYLINE. I need to be able to preserve the appearance.

Re: cannot convert a POLYLINE to a LWPOLYLINE

Patchy — Thu, 18 Jun 2020 20:27:47 GMT

Re: cannot convert a POLYLINE to a LWPOLYLINE

devitg — Sun, 21 Jun 2020 19:32:28 GMT

@KevinMacDonald Hi , the main fact is that it is a "AcDb3dPolyline" whose Z value are not constant to any value.

do you want to be all Z to 0 (zero)??

Re: cannot convert a POLYLINE to a LWPOLYLINE

KevinMacDonald — Sun, 21 Jun 2020 19:55:20 GMT

My reason for wanting to get away from polyline is because it is
problematic extruding them into 3D objects. A 'Closed' LWPOLYINE is
generally what I need. Sometimes FLATTEN or FLATSHOT get me to where I
need, but not consistently. I'm often importing art work from Illustrator
and it is kind of a garbage clean up process. A lot of times Illustrator
will give me Splines, and the PEDIT command converts those to polyline not
LWPOLYINE.

Re: cannot convert a POLYLINE to a LWPOLYLINE

devitg — Sun, 21 Jun 2020 20:20:06 GMT

@KevinMacDonald

Hi , please check it .

Re: cannot convert a POLYLINE to a LWPOLYLINE

devitg — Sun, 21 Jun 2020 20:36:43 GMT

@KevinMacDonald How about it ?