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Offset Path tool creates non-parallel lines and incorrect measurements

Community Beginner ,
Oct 15, 2020

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Hi- 
I've used illustrator for years and never had this problem
When I offset the paths of a rectangle at -.007 inches, the resulting smaller "rectangle" does not have 90 degree corners, and the lines are not parallel with the original rectangle. 

The "align art to pixel grid" is turned off, near as I can tell. 

The original rectangle measures 7.5 by 3.5 in the transform window.
The offset "rectangle" "measures" 7.5 by 3.493...  the math on that isn't right any way one looks at it.

I'm using illustrator to create CNC cut paths, and this is really putting a wrench in the works.

Can anyone tell what is going on here?

 

Screen Shot 2020-10-15 at 6.25.12 PM-1.png

 

Screen Shot 2020-10-15 at 6.25.28 PM-1.png

Screen Shot 2020-10-15 at 6.26.11 PM-1.png

Screen Shot 2020-10-15 at 6.26.29 PM-1.png

Screen Shot 2020-10-15 at 6.25.44 PM-1.png

 



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Offset Path tool creates non-parallel lines and incorrect measurements

Community Beginner ,
Oct 15, 2020

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Hi- 
I've used illustrator for years and never had this problem
When I offset the paths of a rectangle at -.007 inches, the resulting smaller "rectangle" does not have 90 degree corners, and the lines are not parallel with the original rectangle. 

The "align art to pixel grid" is turned off, near as I can tell. 

The original rectangle measures 7.5 by 3.5 in the transform window.
The offset "rectangle" "measures" 7.5 by 3.493...  the math on that isn't right any way one looks at it.

I'm using illustrator to create CNC cut paths, and this is really putting a wrench in the works.

Can anyone tell what is going on here?

 

Screen Shot 2020-10-15 at 6.25.12 PM-1.png

 

Screen Shot 2020-10-15 at 6.25.28 PM-1.png

Screen Shot 2020-10-15 at 6.26.11 PM-1.png

Screen Shot 2020-10-15 at 6.26.29 PM-1.png

Screen Shot 2020-10-15 at 6.25.44 PM-1.png

 



[ attachment inserted as inline image by moderator ]

 

 

 

 

 

TOPICS
Bug, Draw and design, Tools

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Oct 15, 2020 0
Adobe Community Professional ,
Oct 15, 2020

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I'm not able to replicate the issue. What happens if you Object > Expand the original rectangle before using Offset Path? Is it possible that the rectangle has slightly rounded corners (easy to do accidentally with the corner widgets)?

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Oct 15, 2020 1
Community Beginner ,
Oct 16, 2020

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Thank you Barbara-

I've tried expanding it, then offsetting, and get the same results, even with a new 3"x3" square-  same results.  
The corners are sharp on both.

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Oct 16, 2020 0
Most Valuable Participant ,
Oct 16, 2020

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@lucasschwartz 

what version of Illustrator are you using?

 

I wonder.

0.007 inches refer to half a pixel --> left + right = 1 pixel
Can you show us your advanced options for aligning to pixels (if CC)

align_to_pixel_grid.png

 

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Oct 16, 2020 0
Community Beginner ,
Oct 16, 2020

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I'm on CC 24.3

The advanced pixel options are all unchecked boxes.

Screen Shot 2020-10-16 at 12.45.45 PM.png

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Oct 16, 2020 0
Most Valuable Participant ,
Oct 16, 2020

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Lucas,

 

The X and Y values rule out anything related to the pixel grid.

 

The offset seems to be a strange mixture or rotation and skewing.

 

I am afraid you are looking at a corrupt document, or a more general corruption.

 

In the former case you can recreate the same artwork (7.5 x 7.5" to start with) and make it work, quite possibly also by copying and pasting the artwork into a new document (if not entirely, you can often move most/some, maybe in portions).

 

In the latter case, you can try the list and hope for one of the easier ways at the top.

 

 

 

THE LIST

 

 

If things that should work simply refuse to (all possibilities exhausted including the A) - C) below (and carefully making sure you are performing (all) the needed things)), you may try (the relevant part(s) of) the list 1) - 8 ) below.

 

 

Sometimes, (certain) things may fail or stop working for no apparent reason. When the (other) possible reasons/cures fail to work, it may be some kind of (temporay or permanent) corruption, or even some inconvenient preference setting(s), which may be cured with something on the following list set up in an attempt to provide a catchall solution for otherwise unsolvable cases. It starts with a few easy and harmless suggestions 1) - 3) for milder cases, and goes on with three alternative ways 4) - 6) of resetting preferences to the defaults (easily but irreversibly and more laboriously but more thoroughly and also reversibly), then follows a list 7) of various other possibilities, and it ends with a full reinstallation 8 ). If no other suggestions work, or if no other suggestions appear, you may start on the list and decide how far to go and/or which may be relevant.

 

 

 

The following is a general list of things you may try when

 

A) The issue is not in a specific file,

B) You have a printer correctly installed, connected, and turned on if it is physical printer (you may use Adobe PDF/Acrobat Distiller as the default printer with no need to have a printer turned on, obviously you will need to specify when you actually need to print on paper), and

C) It is not caused by issues with opening a file from external media.

D) It is not caused by other applications (you may close down/disable everything else running, including browsers and antivirus, then try again). There are quite a few usual suspects that may disturb and confuse Illy (job description Adobe Illustrator) so she moves in mysterious ways (even more than usual, some would say).

 

You may have tried/done some of them already; 1) and 2) and 3) are the easy ones for temporary strangenesses, and 4) and 5) and 6) are specifically aimed at possibly corrupt/inconvenient preferences); 7) is a list in itself, and 8 ) is the last resort.

 

If possible/applicable, you should save current artwork first, of course.

 

1) Close down Illy and open again;

2) Restart the computer (you may do that up to at least 5 times);

 

3) Log out of your Adobe account and log back in;

 

4) Close down Illy and press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (easy but irreversible);

5) Move the folder (follow the link with that name) with Illy closed (more tedious but also more thorough and reversible), for CS3 - CC you may find the folder here:

https://helpx.adobe.com/illustrator/kb/preference-file-location-illustrator.html

 

6) Follow the instructions here: https://helpx.adobe.com/illustrator/using/setting-preferences.html

 

7) Look through and try out the relevant among the Other options (follow the link with that name, Item 7) is a list of usual suspects among other applications that may disturb and confuse Illy, Item 15) applies to CC, CS6, and maybe CS5);

 

Even more seriously (this may be serious because you may need to restore plugins and whatnot afterwards if you have customized things), you may:

 

8 ) A) Uninstall (ticking the box to delete the preferences if applicable), B) run the Cleaner Tool (if you have CS3/CS4/CS5/CS6/CC), and C) reinstall. You may try without step B), but sometimes it is needed, because otherwise things may linger.

 

As it appears from this thread, it may be worth repeating this if it fails to help the first time:

https://forums.adobe.com/thread/2283530

 

To uninstall:

https://www.adobe.com/search.html#q=uninstall%20illustrator&sort=relevancy&start=1

 

Cleaner Tool:

http://www.adobe.com/support/contact/cscleanertool.html

 

 

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Oct 16, 2020 1
Community Beginner ,
Oct 19, 2020

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Thank you for this list- 
I have exhaustively tried everything on it, near as I can tell.
In the end, I've completely uninstalled and reinstalled every piece of Adobe software 3 times now, following the instructions.
I've also removed all of the 3rd party fonts from my system, in an attempt to make it clean, clean, clean. 

Still-  I'm experiencing the same phenomenon.   
Fresh upon startup, brand new installation, no other programs running, after shutting down 5 times in a row. 


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Oct 19, 2020 0
Adobe Community Professional ,
Oct 16, 2020

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I also can't reproduce this.

Is it a Large Document?

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Oct 16, 2020 1
Community Beginner ,
Oct 16, 2020

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Hi Monika-
This seems to be a step in the right direction-

I opened a new document, and performed the same actions with a 3x3 square, and got the proper results-  a .007 inch offset parallel with all the sides. 

I then opened a new document at 384 inches wide, and 192 tall, and this problem occured again with a fresh document.

It seems to be related to the large canvas size.

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Oct 16, 2020 0
Adobe Community Professional ,
Oct 16, 2020

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Hmm. In that case, you could do all the offsets first and then enlarge the canvas as needed afterwards.

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Oct 16, 2020 0
Community Beginner ,
Oct 16, 2020

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I'm working on a file for a CNC architectural project.  Historically I've had to work at scale to do this, and it was a comparatively long and frustrating process.   Having the new larger canvas size option was a major step forward for my workflow-  

I use the area both on the canvas, and outside the canvas to do my work.   At a certain size, the area around the canvas becomes much larger-  It now appears to be the case that this may also be the threshold where this problem occurs.  (Not certain, but it's seeming likely.)

Attached are some photos of different canvas sizes, and their corresponding workable area outside the canvas.  The text is a consistent size, and 3000pt, and the red square is 3 inches in each photo.  Each example is zoomed out all the way.  Notice the usable area outside the canvas in the 3rd photo.

This seems to be a reproducible bug.  I really hope Adobe can fix this, as it's super important to my workflow!

96x48.png

192x96.png

288x144.png

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Oct 16, 2020 0
Community Beginner ,
Oct 17, 2020

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Is anyone able to replicate this issue with a larger canvas size?

For example, at 384 inches wide, and 192 high?

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Oct 17, 2020 0
Adobe Community Professional ,
Oct 17, 2020

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I tried it with the 384 x 192 artboard. The outer rectangle is 7.5 x 3.5 inches; the offset rectangle measures 7.486 in x 3.486 in

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Oct 17, 2020 1
Community Beginner ,
Oct 19, 2020

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Thank you for trying that-
I don't know what to think-
I've tried all of the above suggestions, and I'm still getting the same phenomenon.  

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Oct 19, 2020 0
Adobe Community Professional ,
Oct 19, 2020

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A shot in the dark, but what happens if you zoom in closely on the rectangle and then offset it. The zoom level may make a difference. 

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