Strand 7 API can not calculated beam section data

[RTT566]

Hello,

I'm encountering an issue when trying to compute complete beam cross-section properties using the Stran7 R3 API. I would appreciate any guidance on whether I'm missing a required step or configuration.

Here’s what I’m doing and observing:

1. For predefined sections (e.g., TopHat):
   I use St7SetBeamSectionGeometry to set the basic geometry of the section.
   Then call St7CalculateBeamSectionProperties(uID, Prop_ID, DoShear) to compute all section properties.

However, when I retrieve the results via St7GetBeamSectionPropertyData, many values are zero, including:
Torsion constant (J)
Shear centre offsets (L1/L2)
Shear areas (A1/A2)
Centroid coordinates (Xc, Yc)

The only successfully computed values are:
Section area (Area)
Second moments of area (I11, I22)
I expected St7CalculateBeamSectionProperties to compute all standard section properties — is there an additional step or flag required?

I've already tried calling St7CheckBeamSectionQuality, St7SetBeamSectionNominalDiscretisation, etc., but they don’t seem to help.

2. For meshed sections (via IGES import + St7GenerateBXS):
   I successfully import an IGES file using St7ImportIGES.
   Generate a mesh for the section.
   Call St7GenerateBXS(...) to create a .BXS file with calculated properties.
   But again, the resulting BXS file does not include torsion constant or shear areas — only area and second moments.

My question:

Am I missing a necessary preprocessing step, API call, or setting before St7CalculateBeamSectionProperties or St7GenerateBXS can compute the full set of properties?

Could someone please clarify:

What conditions must be met for these functions to compute all section properties?
Are there known limitations for certain section types (like TopHat)?
Is there an example or workflow that demonstrates how to fully calculate J, shear areas, centroid, and shear center?
Any help or example code would be greatly appreciated!