AutoCAD 2018 reverse won't work

[Anonymous]

 Hi there,

I'm in the middle of learning AutoCAD for the first time and I'm following the Udemy course, was going well until I ended up on the reverse tool. 

I have changed the 'PLINEREVERSEWIDTHS' to 1, and try using the reverse tool, and still not reversing the object visually.

Anyone have any ideas?

[ennujozlagam]

To Reverse Lines, Polylines, Splines, or Helixes
Click Home tab Modify panel Reverse. Find Select a line, polyline, spline, or helix to reverse

[Alfred.NESWADBA]

Hi,

>> still not reversing the object visually

Can you please show us what you have, that should "change visually"?

Please copy the first object, then on the second object run _REVERSE and then show us a screenshot.

- alfred -

[cadffm]

It works without any problems in my 2018.1.2 (Command: _VERNUM = "O.161.0.0)

I am sure you want another thing.

1. Command Reverse is only to change the direction of (poly)lines.

So, nothing change visible on screen, except the pattern of some linetypes and for polylines with unequal width,

the start/endwidth If you set PLINEREVERSEWIDTHS = 1.

Try it with my attached sample.

[Anonymous]

So in the udemy course it shows a filled in triangle that gets flipped. I'm trying with a polyline triangle, maybe thats why?

Udemy Example:

Udemy originalUdemy Reversedignore object on left, triangle to the right is what i'm trying to flipPlinereversewidths = 1after reverse, still facing same direction

Does it only apply to objects with a thickness? I think that's what the reply below stated, or at least what I understood

[Anonymous]

Yeah, it works on the file you provided. the sawed side still stays on the right of the image, but the thicknesses are changed.

Maybe I'm misunderstanding the purpose of reverse. I'm expecting it to flip any given object..but that doesn't seem to be the idea of it

[cadffm]

Check my sample file.
In polylines each segment have start and end width.

Reverse can change start to end width and end to start width

https://forums.autodesk.com/t5/autocad-forum/autocad-2018-reverse-won-t-work/m-p/8241164#M947325

[cadffm]

"Yeah, it works on the file you provided"
Ok.

Create a line, can you use a linetype with text inside the linetype? Do it if you can.
Check start and endpoint with command LIST (and [F2])

Use reverse

Check the properties again.
with command LIST (and [F2])

[Alfred.NESWADBA]

Hi,

>> it shows a filled in triangle that gets flipped.

>> I'm trying with a polyline triangle

I guess that's the problem, you don't see "filled triangles", you see a polyline with 2 vertices (not a triangle with 3 vertices). And the start-vertex has a width while the end-vertex has no width and so the polylines gets smaller from start to end. Reversing means now the direction changes, depending on the sysvar the start width and endwidth are changed as well or not.

When you draw a rectangle (3 straight segments) and all segments have 0 width or a constant width you won't see a visual change. That's why I asked for a dwg-file instead of screenshots.

- alfred -

[Anonymous]

I haven't reached that point yet to "Create a line, can you use a linetype with text inside the linetype?".

I saw some youtube videos showing that when reverse is used, the points themselves are renumbered in reverse.

I think I am expecting the wrong action from reverse. I'm expecting reverse flips the physical points of an object to flip it, almost like a mirror on the spot.

I realized from Udemy's example and yours is that the line thickness is reversed and not the entire object itself.

So here's a question to clarify: Can a polyline without a thickness in the lines be visually/physically flipped using reverse? or must there be a thickness change of the line for it to reverse it?

[Anonymous]

---

@Alfred.NESWADBA wrote:

Please copy the first object, then on the second object run _REVERSE and then show us a screenshot.

- alfred -

---

You had asked for a screenshot. 

I've attached the triangle file I created that I'm trying to reverse

[Paul_Gander]

---

@Anonymous wrote:

Maybe I'm misunderstanding the purpose of reverse. I'm expecting it to flip any given object..but that doesn't seem to be the idea of it

---

Hi @Anonymous

I believe the command you want for what you have described is MIRROR.

http://help.autodesk.com/view/ACD/2019/ENU/?guid=GUID-595277C8-9B87-4CFB-A3AF-769537A22F3D

[cadffm]

For mirroring use command mirror
Command: Mirror [F1]

[Alfred.NESWADBA · Accepted solution]

Hi,

>> I've attached the triangle file I created that I'm trying to reverse

I've tried to describe that what you showed as example was not really a triangle, what you have in your drawing is a triangle. That's the first difference.

Back to your basic question, what do you expect for your triangle if the vertices are reversed. What visual difference do you see if you draw a triangle in the order point 1 to 2 to 3 or point 1 to 3 to 2 ==> no difference visible.

What you showed in your first screenshot (as well as the drawing you have got from @cadffm) was a polyline with widths, start-vertex and and-vertex have different widths ... and now you can see a difference when you run command _REVERSE and the variable PLINEREVERSEWIDTHS is set to change the width direction too.

I have attached a video that shows how to create a polyline with widths and how to edit it afterwards.

- alfred -

[Kent1Cooper]

---

@Anonymous wrote:

... Can a polyline without a thickness in the lines be visually/physically flipped using reverse? …. 

---

For that, use MIRROR.  All REVERSE does is to change which end of it is the start, and therefore which direction it proceeds -- it does not change the coordinates of the vertex locations.

[Anonymous]

 Thanks for your help everyone. I think I get it now. I misunderstood the Udemy course lesson, but thanks for all the clarification and example files! Helped a great deal

[farah_obead84]

HI,
Reverse works on lines and polylines, when I tried to use it on curve is not working, and it said that no object found.

[pendean]

---

@farah_obead84 wrote:
HI,
Reverse works on lines and polylines, when I tried to use it on curve is not working, and it said that no object found.

---

So... the command only works on specific object types, did you not get a chance to look that up when the program noted that exact limitation to you

BTW do you need to use MIRROR as the other tip offered https://forums.autodesk.com/t5/autocad-forum/autocad-2018-reverse-won-t-work/m-p/8242402#M947375 

[Kent1Cooper]

If you want to reverse the direction that an Arc or Circle or Ellipse "runs," but in the same Coordinate System, it is necessary to change its object type, which is why AutoCAD's REVERSE command won't do it.  If that's what you want, enough to live with the different object type, you can use ReverseDirection.lsp with its RD command, >here<.

[Kent1Cooper]

Another consideration:  Why do you need to reverse curves?  If it's for uprightness of text elements in linetypes, those can be defined to always be in the more-upright orientation, without reversing the running direction of objects using those linetypes.  If that's what you need, see the Rotation section >here<, and change linetype definitions as needed.