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random change of Z coordinate

Vic Phillips's Photo Vic Phillips 19 May 2020

I am a 30 year+ user of AutoCAD, and recently DL'ed nanoCAD Free for occasional home use, in making simple 2D plans for woodworking projects. It's very familiar in most respects, but I I have run into a problem that is causing much trouble. It seems that random drawing objects will change the Z coordinate by a huge factor, for no apparent reason. It just isn't possible to do this in error, or unknowingly. As close as I can determine, it happens most frequently with closed polylines created with the RECTANGLE command. I am on the World UCS ins Model space, and no matter how carefully I create these rectangles, confirming that all vertices are on "0" elevation, if I copy, rotate or simply move the rectangle, the Z coordinate will change, by as much as 4000 dwg units. This also happens more randomly with single lines, and only on one endpoint. With any drawing element, If I access the properties and manually change the elevation back to "0," the whole object just disappears.
Is the installation corrupted? Is there some bug? Any help would be welcome!
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pguimber's Photo pguimber 20 May 2020

Hello,
a file for see the problem ?

Cordialy
Patrick
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Vic Phillips's Photo Vic Phillips 21 May 2020

This one. Simple 2d layout, for my build use, not for presentation.
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Vic Phillips's Photo Vic Phillips 21 May 2020

Sorry. Try again.

Attached Files

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pguimber's Photo pguimber 22 May 2020

Hello Vic,
Sorry, not possible to reproduce the bug on my computer :unsure: .
Idon't see where is the bug

When this problem occurs, a regeneration of the drawing gives what

A file with objects that have changed Z?
to see if this change is saved and if it allows me to see this problem: "If I access the properties and manually change the elevation back to "0," the whole object just disappears."

Best regards
Patrick
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Vic Phillips's Photo Vic Phillips 27 May 2020

Nothing happens when I regen. This issue is not happening accidentally; it takes a bit of effort to change Z coordinates.
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pguimber's Photo pguimber 28 May 2020

Hello,
When I look at the drawing in 3D (shift+mouse wheel), indeed there are entities in many Z.

So when we draw with rectangles, polyline, circles and hang on an object with a Z, it is positioned on the Z of the clicked object. This is normal. A polyline stalls on the starting z. A single line can "navigate" through the Z.

But why Z in this drawing? often this happens when drawing using a file that already has Z's like a topographer's drawing, for example.
When it is the case it is necessary to flatten the drawing to avoid being "polluted" his work by unwanted Z.

Does this happen in a new blank file?
cordially
Patrick
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pguimber's Photo pguimber 28 May 2020

To flatten the drawing simply, select the entire drawing and in the properties, filter the object types then set the Z or the elevations to 0
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