[Gmsh] BooleanFragments output identification

[Lionel Wilhelm]

Dear Gmsh community,

I'm quite new to Gmsh and I'm trying to use the recently available 
OpenCASCADE functionalities. I would like to know if there is a 
programatically mean to identify the results of a BooleanFragments 
operation.

I have two boxes and I would like to cut them with a surface imported as a 
stp (ShapeFromFile command). So far, my script (attached) works well in the 
sense that both of my volumes are cut as expected. I store the output  of 
the  BooleanFragments command in a list v() and label each element in order 
to control which id number is which volume. I would like to know which 
volume is above and which volume is below the surface.

For instance, is it possible to return the center of gravity (COG) of a 
volume ? Based on the COG coordinates, I could identify both volumes.

Kindly,

Lionel
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