CAD Forum

Hi Everybody,
after changing coordinate system I need to extract new mass properties.

In particular, I need to get principal intertia axes: I thought the function PrincipalAxesOfIntertia (IMass2) did exactly this.
I found the data extracted are not the same as those I found on mass properties window (I have same absolute values but different signs on x and y array and same data on z array).

Does anyone know why? Does exist another function to do this task?

Thanks in advance,

Mattia

If using IMassProperty2, you can set the coordinate system and then recalculate the mass properties.

https://help.solidworks.com/2021/englis ... ystem.html

That's what I did: I created a new coordinate system, set it and finally recalculated mass properties.
Then I extract all mass properties and I can see the values are the same as those I can read into mass properties window.
Only Principal Axes of Inertia make an exception: they have all the absolute value that I expected but different signs (in particulare opposite signs in x-y arrays and same sign in z array).

Hi @Mattia Bianchi, is there any chance you can send this model so I can troubleshoot? I have a lot of problems with IMassProperty2 (not as many as I had with IMassProperty), but I have found a few workarounds so want to give it a run on your model). The workarounds are applied in xCAD: https://github.com/xarial/xcad/blob/mas ... roperty.cs