tema how to move the weight center of an irregular object to origin (0,0,0) in AutoCAD for Mac en AutoCAD for Mac Forum

how to move the weight center of an irregular object to origin (0,0,0) in AutoCAD for Mac

LeoImLeo — Wed, 05 May 2021 02:50:00 GMT

I have plotted a few objects in one file, for example, 1 desk and 4 chairs.

Now I wanna AutoCAD for Mac to automatically find the weight center of the desk, and move this center to origin (0,0,0), and ignore the remaining part (4 chairs for example).

How can this be done?

Re: how to move the weight center of an irregular object to origin (0,0,0) in AutoCAD for Mac

maxim_k — Wed, 05 May 2021 08:03:16 GMT

Hi @LeoImLeo ,

What do you mean by "weight center of the desk"?

If it is Geometric-Center, then you can use MOVE command to move the "desk" object using this command sequence:

Command: MOVE
Select objects: 1 found <- Select desk
Select objects: <- Hit Return
Specify base point or [Displacement] <Displacement>: _gcen of <- Use Geometric Center object snap
Specify second point or <use first point as displacement>: #0,0 <- Type this and hit Return

HTH

Re: how to move the weight center of an irregular object to origin (0,0,0) in AutoCAD for Mac

LeoImLeo — Wed, 05 May 2021 18:37:56 GMT

Hi @Maxim ,

Yes it is Geometric-Center, then I use MOVE command to move the "desk" object using this command sequence:

I have a problem with this step:

<- Use Geometric Center object snap

After typing "_gcen", "of" will appear after typing space, then how can I snap the full object? It does not show a small green triangle of central part of an object.See my attached screenshot.

Re: how to move the weight center of an irregular object to origin (0,0,0) in AutoCAD for Mac

maxim_k — Thu, 06 May 2021 10:56:43 GMT

Hi @LeoImLeo ,

Geometric-Center works only with closed polylines and splines as stated here:
https://help.autodesk.com/view/ACDMAC/2022/ENU/index.html?guid=GUID-A782462F-F85C-4496-85A5-3D9A54548489

So you cannot use Geometric-Center OSNAP directly on 3D Solid in your drawing.
You can use 3D Object Snap to snap to the center of the face - "_zcen":
https://help.autodesk.com/view/ACDMAC/2022/ENU/index.html?guid=GUID-06D81B23-B171-4F33-920B-4609E22DD9E5

If you need use Center of Gravity as base point, then on Mac you can only get it's approximate coordinates with MASSPROP command. In AutoCAD for Windows you can use AutoLISP routine with ActiveX interface, which is not available on Mac.