Calculates the geometric properties of the section consisting of the visible surface(s) in the model
| obj | Pointer to this object | Allows multiple function calls to be chained together | 
| cArea | double | Cross sectional area | 
| cIxx | double | Second moment of area about x axis | 
| cIyy | double | Second moment of area about y axis | 
| cIxy | double | Product moment of area | 
| cJ | double | Torsion constant | 
| cAsx | double | Effective shear area in the x direction | 
| cAsy | double | Effective shear area in the y direction | 
| cxc | double | x coordinate of the centroid | 
| cyc | double | y coordinate of the centroid | 
| data | optional IFGeometryData | |
| fileName | optional string | temporary file name created to contain the boundary information; delete this file after calling this function | 
| Return value | integer | 
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