[Gmsh] BooleanFragments output identification

David Colignon David.Colignon at uliege.be
Sun Nov 26 19:46:54 CET 2017

Hi Lionel,

You could try:


BoundingBox Point|Line|Surface|Volume { expression }



David Colignon, Ph.D.
1er Logisticien de Recherche
Université de Liège
ACE - Applied & Computational Electromagnetics
Quartier POLYTECH 1 - Montefiore B28
Allée de la découverte 10
4000 Liège - BELGIQUE
Tél: +32 (0)4 366 37 32

On 26/11/2017 16:10, Lionel Wilhelm wrote:
> 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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