First moment of area is always zero

[BagheriIG]

I'm trying to create a section library using sectionproprties and I have various types of sections. But there is an issue that I get the Q (using the get_q method of Section) as zero for all of my sections. Is there any specific consideration for getting this property?
Below, I have the properties of IPE sections that are calculated and extracted using this package. As you can see, Q values are 0.0, and other properties are correct.

[github-actions]

Thanks for opening your first issue in sectionproperties 🙌 Pull requests are always welcome 😉

[robbievanleeuwen]

First moments are taken about the global origin and are thus dependent on how you model your geometry. If the centroid of the IPE coincides with the origin the first moment will be zero. However if the bottom left corner of the IPE is at the origin the first moment will be non-zero.

[BagheriIG]

You are absolutely right about the general definition of the first moment of inertia. Since I've set the elastic center as the origin of my sections, it makes sense to have zero values for them. But there is a tendency to have the half-section (top or bottom about the neutral axis) Q for the sections in order to have the maximum first moment of inertia. Especially when we are dealing with the shear stress.