Hi Thomas, Take a look at the Compound Line/Surface/Volume entities in Gmsh.  
These will probably do what you want.

Regards,
Dave


> On Mar 10, 2015, at 7:42 AM, Thomas Bernhardt <[email protected]> wrote:
>
> Hello,
> I am trying to create a mesh in gmsh of a model that I have imported. The 
> problem that I find is that every line in the model divides the mesh. Is 
> there a way to mesh the whole surface as one body ignoring the lines that 
> divide parts. For example on a simple aircraft model there will be a line 
> dividing the metal surface from the glass of the cockpit. However, when 
> defining a mesh I want to ignore this division and treat it as one single 
> surface. Thanks for any help you can provide.
>
> Thomas Bernhardt
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