topic Re: polyline arc reversed in AutoCAD Forum

polyline arc reversed

florent.forest — Fri, 26 Mar 2021 14:10:11 GMT

hi,

This morning when i opened a drawing in autocad 2017 some of the arc in my polylines were reversed as you can see in the image.

I tried to fix it by reversed the polyline but not all arc have been inverted so it didn't fix anything.

What can i try?

Thanks,

Florent

Re: polyline arc inverted

pendean — Fri, 26 Mar 2021 14:02:19 GMT

Polylines Inverted? Please explain in more detail, maybe add comments to your screenshot if possible.

Re: polyline arc inverted

imadHabash — Fri, 26 Mar 2021 14:09:10 GMT

Hi,

>> This morning when i opened a drawing in autocad 2017 some of the arc in my polylines were inverted

How it could be ?!! maybe it's some how happened by mistake by you . i mean that AutoCAD didn't do this by itself . would you please describe more your issue ?

Re: polyline arc inverted

florent.forest — Fri, 26 Mar 2021 14:12:59 GMT

Sorry my software is in french it's probably reversed in english, i posted a new image probably more clear

Re: polyline arc reversed

florent.forest — Fri, 26 Mar 2021 14:15:19 GMT

I know that the problem is probably something i did but i don't know what.

in my polyline some of the arc are reversed but not all and i don't know how to fix it.

Re: polyline arc reversed

imadHabash — Fri, 26 Mar 2021 14:18:50 GMT

select the polyline arc without command then put your mouse over the middle grip tell a menu appear . now select Convert to line option , any changes ?

Re: polyline arc reversed

florent.forest — Fri, 26 Mar 2021 14:30:19 GMT

Yes it become a line and when i select it again and transform it to arc it reverse to how it was before

Re: polyline arc reversed

Kent1Cooper — Fri, 26 Mar 2021 14:50:10 GMT

What a phenomenon! It appears that each too-much arc segment is the rest of the circle that the arc segment you want is a part of. The bulge factors have gotten screwed up, both in reversed sign and also numerical value, though what would do that, I can't imagine.

If no catch-all solution is found, but if, in fact, each is the rest of the circle that the arc segment you want is a part of, and therefore is of the same radius and shares a common center point with it, you can fix them with FilletMatchRad.lsp and its FMR command, available >here<. It asks you to select a curve to get a radius from -- pick the "wrong" most-of-a-circle arc segment. Then pick the adjacent line segments, and it will Fillet them using the same radius, which presumably will correct the situation. If you know that any of them are of the same radius, you don't need to start over for each one, but can pick just one "wrong" segment to get that, and then pick as many pairs of straddling line segments as you want.

Re: polyline arc reversed

florent.forest — Fri, 26 Mar 2021 15:00:18 GMT

I'm trying the tool send me an error :

Error: type d'argument incorrect: point 2D/3D: nil (incorrect type of argument : point 2d/3d : nil)

Re: polyline arc reversed

Kent1Cooper — Fri, 26 Mar 2021 15:15:24 GMT

@florent.forest wrote:

I'm trying the tool send me an error :

Error: type d'argument incorrect: point 2D/3D: nil (incorrect type of argument : point 2d/3d : nil)

If that was in Reply to me, try the attached updated version of FilletMatchRad.lsp. I'm hoping it's just a language issue -- not all of the entries that could use it had the _underscore prefix that makes them work in any language version of AutoCAD, so I just added those. If it still doesn't work, write back with as much detail as you can supply, including preferably a small sample drawing file.

[Just to keep it clear who you're Replying to, don't use the Reply to the topic... slot at the bottom, which is always in Reply to Message 1, so it looks like you're Replying to yourself. Always use the Reply button at bottom right in an individual Message.]

Re: polyline arc reversed

florent.forest — Fri, 26 Mar 2021 15:27:00 GMT

it doesn't seems to work as it is all part of the same polyline

the tool try to create a chamfer between 2 lines but what i need is the other part of the arc that is not apparent

Re: polyline arc reversed

florent.forest — Fri, 26 Mar 2021 15:33:31 GMT

Correction! it works for some of them but not all sometimes i can't select the second segment it takes all the polyline

Re: polyline arc reversed

florent.forest — Fri, 26 Mar 2021 15:39:35 GMT

it doesn't work on one part of the line cf image

do i do a wrong manipulation?

Re: polyline arc reversed

Kent1Cooper — Fri, 26 Mar 2021 15:59:33 GMT

Within a Polyline, Fillet needs you to select two segments with no more than one segment between them. I hope you have a line segment adjacent to each end of the arc segment you want to fix, but at the top of your image, if there's a line segment, it must be very short. You would need to pick on the line segment, not the arc segment heading off to the right. [We can't really tell what the situation is from just an image -- this is why a sample drawing file would help.]

Re: polyline arc reversed

Pointdump — Sat, 27 Mar 2021 08:59:09 GMT

Florent,
I've seen this before in Civil 3D. Have you tried turning off Hardware Acceleration or High Quality Geometry?

Dave

Re: polyline arc reversed

florent.forest — Mon, 29 Mar 2021 06:42:37 GMT

Thanks that was the solution