[Gmsh] Aligning normals

[KINOSHITA Kazuhiko]

Hello,

I'm using gmsh for meshing for BEM application. 
As you can see, some normals on surfaces need to be flipped for BEM application.
Currently, I visually check normals in geofile imported on the screen, then flip the vectors of surfaces manually one by one. 
This is time consuming work and may cause forgetting reverse.
For the reason, I want to know if there is way to align reversal normals to a correct normal at once. 

Thank you in advance,
Kaz Kinoshita

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