Origin Jump

[Anonymous]

Since upgrading to AutoCAD LT 2017 from 2016 I have experienced a problem in one large drawing where the origin of the drawing changes position occasionally, always by the same amount and without any instruction. As the drawing sets up a site setting-out datum this is a serious issue to me.

Any ideas?

[imadHabash]

Hi and welcome to AutoDesk Forum,

we need more details...

BUT if we're talking here about Xrefs, try to check coordinates data from BASE command.

[Anonymous]

Thanks, but it's not only X-refs, it's everything on all layers in model space. Doesn't happen every time I edit the drawing but it has now happened four times and each time the entire drawing moves 6.4 units (metres) along the X axis and 3.0 units up the Y axis. The file is just under 8MB in size.

David.

[pendean]

origin? As in someone moved your model, or an XREF shifted without noticing it until everyone else did?

[Kent1Cooper]

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@Anonymous wrote:
... each time the entire drawing moves 6.4 units (metres) along the X axis and 3.0 units up the Y axis. ....

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Is it actually Moving everything, or do positions of things just report differently [such as in LIST or the Properties box] because it's changing the 0,0 origin to a different UCS from whatever you want to be in [whether that's the WCS or otherwise]?  Does U [undo] move everything back?  Does UCS World or UCS Previous restore the way it's supposed to be?  Are you using any custom commands/routines that might be changing the UCS?  Are you able to notice exactly when it happens, so that you can know what you did just prior to that?

One way to check the UCS-is-changing possibility:  In the WCS [even if only temporarily, if you work in some other UCS], draw something simple, such as a Circle with its center at 0,0,0.  Check that the Properties box and LIST report its center there [and where they report it in your other UCS, if applicable].  When the change happens, check that Circle again.  Assuming those sources now report a different center point, do this:

(cdr (assoc 10 (entget (car (entsel "\nSelect the Circle: ")))))

and if that returns

(0.0 0.0 0.0)

it means the Circle has not been moved,since that will report the WCS coordinates of the center, but the UCS origin has been changed.  If that reports

(6.4 3.0 0.0)

then things have actually been Moved, and it's not a UCS issue.

[pendean]

No Lisp in LT @Kent1Cooper

[Anonymous]

Thanks again.

It appears to be moving everything. My fix the first couple of times this happened was to thaw all layers and switch everything on, then select everything and move it all back to where I left it. I then had to reset all the layer status. This was time-consuming so my latest fix was simply to redefine the origin, so that outputs from any position were reported in the co-ordinates I need them to be. However the last time the drawing, or the origin, moved I noticed that it had moved by the same amount as before but as I was already in a user-defined UCS the objects were now twice as far away from the WCS as they were previously. Nobody else has editing access to this drawing, so the problem is either with the program or my commands.

David.

[pendean]

6.4 and 3 meters is a very precise distance for something to happen randomly four times: is this the same file you opened four times that it has happened in?
What in your design/file is at 6.4,3 coordinates?

[Anonymous]

It is always in the same file and only that file. There is nothing at 6.4,3 because the drawing is set up to match UK Ordnance Survey co-ordinates and in my drawing everything is between 242000, 649000 and 243000, 650000. Miles (or kilometres in fact) away.

David

[pendean]

If LT2017 was the problem, it would happen in ALL of your files and not just one file.

So let's break this one file down:
Are you using the built-in geolocation/GIS Coordinate system in AutoCAD/LT?
How is that different from the time you had this file in LT2016?
Are you logged into A360 if you are using geolocation?

what "origin" do you keep speaking about? and how are you moving it and why do you keep moving it? if you open your file, and it has shifted, but you do NOT move the origin, does your file ever move again when you open it ever again?

[Anonymous]

I am not using geolocation now nor when I was working in LT 2016.
The origin is simply the point 0,0 on the grid, that drives my co-ordinates. That used to be point 0,0 on the WCS and is now 0,0 on my UCS and 6.4,3 on the WCS.

[pendean]

if you open your file, and it has shifted, but you do NOT move the origin, does your file ever move again when you open it ever again?

From HELP: To Restore the UCS to the WCS Orientation: Click the UCS origin grip, and then click World.

[Anonymous]

I now always check co-ordinates at a known point when I close and re-open open the file. Since I started doing that the 'jump' has never happened on opening the file, and the last twice it happened I know was during me working on the file. Although I can't be sure of exactly when each of these instances were, I think it was during or soon after an edit that included a dynamic zoom/pan instruction.

[pendean]

It;s going to be a painful test, but how about, for the rest of the week, you turn off PICKFIRST and PICKADD variables, and see if the moves stop.

[Anonymous]

Thank you, I'll give that a try.

[Emmsleys]

Following up on this thread, were you able to resolve your issue? Could you possibly share that with us in this thread? 

If you are still having an issue with AutoCAD the community and I will be more than happy to help.