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

[LeoImLeo]

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?

[maxim_k]

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

[LeoImLeo]

Hi @Maxim ,

Yes it is Geometric-Center, then I 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

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.

[maxim_k]

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-4496-85A5-3D9A5454...

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-4609E22D...

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.